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Truth Graph · Headphones

What are the best headphones?

Source check on Oct 16, 2026 · Zero affiliate links

How this page knows: all 30 findings passed the source check, 8 open questions ↓

Higher headphone prices do not buy truer sound in lab tests, so your pick comes down to how well a pair blocks low rumbles, fits over glasses, or works with your phone. Below is how Sony, Bose, Apple, Sennheiser, and Soundcore compare with studio picks, how glasses loosen the ear-pad seal, and which batteries swap out.

The category answer

What are the best headphones?

Higher headphone prices do not buy truer sound in lab tests1, so your pick comes down to how well a pair blocks low rumbles1, fits over glasses3, or works with your phone2. Below is how Sony, Bose, Apple, Sennheiser, and Soundcore compare with studio picks2, how glasses loosen the ear-pad seal3, and which batteries swap out4.

Sources and scope notes

Source-checked October 16, 2026 against acoustic studies, lab tests, and brand pages from Product.ai's primary-source research.

axiomatic intelligenceZero affiliate linksFalsifiable findings
axiomatic intelligenceAll 30 findings passed the source check on October 16, 2026.
Zero affiliate linksThis page has no affiliate links.
Falsifiable findingsAll 30 findings name what would prove them wrong.

8 questions not yet answered; 8 more brands not yet checked.How this page knows ↓

Contents: 4 topics and 6 questions

The answer in one sentence

Do not judge sound by price, because a 283-model study found no price link to sound balance. Active noise cancelling (ANC, electronics that cancel outside sound) cuts low rumble below 1,000 Hz, while ear seal blocks higher noise.

About the readings on this page

Reviewed readings cited on this page
51
Have a recorded test that would prove them wrong
51
Last source check
2026-10-16
Questions answered in full
9
Each reading names its source in the sentence, records who checked and reviewed it and when, and states what would prove it wrong. The sources footer lists every source link and quote.

Names to start with

Which headphone brands should I look at?

Here are three wireless starting brands in A to Z order (Apple, Bose, and Sennheiser, with Sony compared in lab tests), followed by a sub-$100 wireless option from Soundcore and wired studio models from Beyerdynamic and Audio-Technica. This order is not a ranking.

Apple logo

Apple

Adaptive Audio
Noise and transparency
Blends noise cancelling and transparency
Battery or link
Needs one Apple Account with two-factor authentication
Service and parts
Coming soon

Adaptive Audio blends noise cancelling and transparency (passthrough audio that lets outside sound in) on recent AirPods with current iOS or iPadOS. It runs on AirPods 4 (ANC), AirPods 5, AirPods Pro 2 and 3, and AirPods Max 2. Automatic switching between iPhone, iPad, and Mac needs one Apple Account with two-factor authentication.

Bose logo

Bose

QuietComfort noise-cancelling
Noise and transparency
ActiveSense for sudden or loud sounds
Battery or link
Up to 30 hours of play time, or 23 hours with Immersive Audio
Service and parts
Coming soon

Bose launched the first QuietComfort noise-cancelling headphones in 2000. In RTINGS's Sony WH-1000XM5 review, the Bose QuietComfort Ultra Headphones were rated more comfortable and better built than the WH-1000XM5, with a slight edge in noise isolation. The QuietComfort Ultra Headphones (2nd Gen) list at $449 with up to 30 hours of play time, or 23 hours with Immersive Audio on. On the QuietComfort Ultra Earbuds (2nd Gen), Aware mode uses ActiveSense to turn noise cancelling on during sudden or loud sounds nearby.

Sennheiser logo

Sennheiser

Momentum 4 Wireless
Noise and transparency
Coming soon
Battery or link
RTINGS measured 62.3 hours of battery life
Service and parts
Replacement ear pads cost 29.90 EUR a pair

RTINGS measured the Momentum 4 Wireless at 62.3 hours of battery life against 27 hours on the Sony WH-1000XM5. Sony blocked more background noise in that test. Replacement Momentum 4 and 5 ear pads cost 29.90 EUR a pair. Four 6.5 mm Phillips screws open the left cup to unplug the battery.

Budget wireless and wired studio options (Soundcore, Beyerdynamic, Audio-Technica): Under $100, NBC Select's November 2025 guide named Sony, Soundcore, and JLab among its favorite budget picks, and SoundGuys reported the Anker Soundcore Space One on sale for $69 from its $99 list price (its LDAC mode works only on devices with Android 8.0 or newer and uses extra battery power). For wired studio listening, Beyerdynamic makes 85% of the headphones and microphones it sells in Germany, and Audio-Technica ships the ATH-M50x with three detachable cords.

How Product.ai knows this17

RTINGS compared the Sony WH-1000XM5 and Sennheiser Momentum 4 Wireless and found Sony's ANC blocked more noise. RTINGS found the Sennheiser more comfortable, better built, and able to run 62.3 hours against Sony's 27 hours. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

RTINGS's compare page says the Sennheiser block noise as well as or better than the Sony.

RTINGS says the Bose QuietComfort Ultra are more comfortable and better built than the Sony WH-1000XM5, with a slight edge in noise blocking. RTINGS calls the noise gap minor and says both work well in loud places. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29

What would prove this wrong

RTINGS's WH-1000XM5 review calls the noise gap large or ranks Sony ahead of Bose on comfort and build.

Bose's support page for the QuietComfort Ultra Headphones calls Aware mode full transparency with stereo sound. The mode lets you hear your surroundings while music plays. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Bose's support page describes Aware mode as something other than full transparency.

Bose's support page for the QuietComfort Ultra Earbuds (2nd Gen) explains ActiveSense in Aware mode. It says ActiveSense automatically turns noise cancellation on during sudden or loud nearby noises, and off when the noise stops. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Bose's support page says ActiveSense in Aware mode does not automatically turn noise cancellation on for sudden or loud nearby noises and off afterward.

Bose's September 2025 press release lists the QuietComfort Ultra Headphones (2nd Gen) at $449 with up to 30 hours of play time per charge. Bose also lists up to 23 hours with Immersive Audio on, and up to 45 hours with noise cancelling off. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Bose's September 2025 release lists a price besides $449 or play times besides 30 hours, 23 (Immersive Audio on), and 45 (noise cancelling off).

Bose's pressroom says Bose introduced the original QuietComfort Acoustic Noise Cancelling headphones in 2000. It says this came 22 years after Dr. Amar Bose's original noise cancellation research. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Bose's pressroom gives a launch year other than 2000 for the original QuietComfort headphones, or dates the original research to other than 22 years earlier.

Apple's June 2023 announcement says Adaptive Audio is a new listening mode on AirPods Pro (2nd generation). The announcement says it dynamically blends (mixes in real time) Transparency mode (letting outside sound in) and Active Noise Cancellation (blocking outside sound). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Apple's June 2023 announcement does not call Adaptive Audio a new listening mode on AirPods Pro (2nd generation). Or the announcement does not say it dynamically blends Transparency mode and Active Noise Cancellation.

Apple's support page lists Adaptive Audio for AirPods 4 (ANC), AirPods 5, AirPods Pro 2 and 3, and AirPods Max 2. Using the mode requires current iOS or iPadOS software. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Apple's support page 108918 lists different AirPods models or drops the iOS and iPadOS rule.

Apple Support says automatic device switching requires the latest operating systems on all devices and the same Apple Account using two-factor authentication. Apple lists AirPods 2 and later, all AirPods Pro, and all AirPods Max as supporting this. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Apple's support page drops the latest-software, same-Apple-Account, or two-factor-authentication requirements, or lists a different set of supported AirPods models.

Sennheiser's EU store lists ear pads for the Momentum Wireless 4 and 5 at 29,90 euros a pair (article 700211). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The Sennheiser EU store page for article 700211 shows a different price, a different pair quantity, or drops the Momentum Wireless 4 or 5.

iFixit's Momentum 4 ear pad guide rates the swap very easy at about 20 seconds. The guide says to pry each pad off at the seam with a spudger (a thin pry tool). It then says to hook the new pad back into the speaker base. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

iFixit giving another rating or time, removing pads without prying at the seam with a spudger, or attaching without hooking the speaker base refutes this.

iFixit's Momentum 4 battery guide rates the job moderate at about 5 minutes. It says you reach the adhesive-held battery behind four 6.5 mm Phillips screws in the left driver (speaker part) housing, then unplug a white connector. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

iFixit's Momentum 4 battery guide skips the moderate or about-5-minute rating. Or it omits an adhesive-held battery, white plug, or four 6.5 mm left-driver-housing Phillips screws.

NBC Select reporter Harry Rabinowitz wrote in his November 2025 guide to headphones under $100 that his favorite budget picks come from Sony, Soundcore, and JLab. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29

What would prove this wrong

NBC Select's November 2025 under-$100 headphones guide names no Soundcore model among its picks.

SoundGuys reported on March 26, 2026 that the Anker Soundcore Space One wireless headphones were on sale for $69, down from their regular $99 price. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29

What would prove this wrong

SoundGuys' March 26, 2026 article gives a regular price other than $99 or a sale price other than $69 for the Space One.

Soundcore's support page says LDAC works only on devices with Android 8.0 or newer. Turning LDAC on also uses more battery power and shortens overall play time. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29

What would prove this wrong

Soundcore's support page states that LDAC works on Android versions before 8.0 or does not reduce overall play time.

Beyerdynamic's company blog post from December 7, 2023 says 85% of the headphones and microphones it sells are made in Germany. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29

What would prove this wrong

Beyerdynamic's December 2023 blog post states a share made in Germany other than 85%.

Audio-Technica's ATH-M50x product page says the headphones come with three detachable cords that unplug for easy swapping. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29

What would prove this wrong

Audio-Technica's ATH-M50x page lists a fixed cable or fewer than three detachable cords.

Best for whom

Which headphones fit how you listen?

Each row links your listening habits to the right headphone style and the research behind it. Unchecked rows say 'Coming soon'.

If you...What fitsWhy it fits
Fly or commute around low engine rumbleOver-ear or in-ear headphones with hybrid active noise cancelling and a tight seal
Active noise cancelling works mainly below 1,000 to 1,500 Hz (pitch level).

Blocking voices and cabin hiss takes a tight seal on your ear.

Switch between an iPhone, iPad, and MacAirPods models with the H2 chip signed in to one Apple Account

Auto switching needs devices on one Apple Account with two step login. Adaptive Audio needs up to date iOS or iPadOS software.

Wear glasses or feel headband pain on long workdaysA lighter headphone (around 260 g) where you can test the ear-pad seal with your frames on
A study with 16 participants tested 500 g to 600 g headsets.

The quarter with the shortest comfort time lost an average of 11 minutes per extra 33 g. Glasses frames also loosen the ear-pad seal, and an air leak under the cup cuts low- and mid-frequency noise blocking.

Want wireless over-ear headphones you can repair when pads or batteries wearA model with snap-on replacement ear pads and a screw-mounted, plug-in battery
On the Sennheiser Momentum 4, ear pads pry off in about 20 seconds.

Four 6.5 mm Phillips screws open the left cup to unplug the battery.

Work out or sweat heavilyComing soonComing soon
Play console or PC gamesComing soonComing soon
Sleep on your side with headphonesComing soonComing soon
Buy headphones for a childComing soonComing soon
How Product.ai knows this11

Zhang and Qiu at Nanjing University measured a feedforward active noise control headset. With front noise, they report maximum active reduction is about 20 dB and bandwidth is mainly below 1,500 Hz. With side noise, they report maximum active reduction is about 12 dB and bandwidth is mainly below 1,000 Hz. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Zhang and Qiu report a non-feedforward headset. Or they report front or side maximum reduction or bandwidth other than about 20 dB, 1,500 Hz, 12 dB, or 1,000 Hz.

Devialet's patent background says headsets that cancel noise with an internal microphone work in a limited frequency range, typically 50 to 1,000 Hz. The patent background says this limit happens due to the instability of the feedback loop. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Devialet's patent background states a typical internal microphone range other than 50 to 1,000 Hz, or a cause other than feedback loop instability.

A 2017 report on CDC Stacks says ANC ear protectors mainly cut low-frequency noise at 500 Hz and below. The US Noise Reduction Rating (NRR, a passive ear-protection score) is measured with the electronics switched off. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The US Noise Reduction Rating is shown to be measured with the ANC electronics turned on.

Apple's June 2023 announcement says Adaptive Audio is a new listening mode on AirPods Pro (2nd generation). The announcement says it dynamically blends (mixes in real time) Transparency mode (letting outside sound in) and Active Noise Cancellation (blocking outside sound). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Apple's June 2023 announcement does not call Adaptive Audio a new listening mode on AirPods Pro (2nd generation). Or the announcement does not say it dynamically blends Transparency mode and Active Noise Cancellation.

Apple's support page lists Adaptive Audio for AirPods 4 (ANC), AirPods 5, AirPods Pro 2 and 3, and AirPods Max 2. Using the mode requires current iOS or iPadOS software. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Apple's support page 108918 lists different AirPods models or drops the iOS and iPadOS rule.

In the journal Work, Odell and Dorbala report that 16 participants wore 500 g to 600 g headsets for up to two hours. They report that heavier headsets were less comfortable for the lower quartile of participants (the quarter with the shortest comfortable wear time). This group averaged 11 fewer minutes of comfortable wear time per 33 g added. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Odell and Dorbala's Work study reports other than 16 participants wearing 500 g to 600 g headsets for up to two hours. Or heavier headsets were not less comfortable for the lower quartile of participants (the quarter with the shortest comfortable wear time). Or that quartile averaged other than 11 fewer minutes of comfortable wear time per 33 g added.

A 2004 Virginia Tech thesis by Jonathan Drapala Sides studied air leaks between an over-ear cup and the head. It found that an air leak strongly cuts low- and mid-frequency noise blocking. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Testing an over-ear cup finds that an air leak leaves low- and mid-frequency blocking unchanged.

Napier Lopez at TNW tested headphones on a rig with glasses frames breaking the ear-pad seal. The broken seal caused a large drop in bass compared with a tight seal. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Repeating the TNW rig test with glasses breaking the seal shows no bass drop.

Sennheiser's EU store lists ear pads for the Momentum Wireless 4 and 5 at 29,90 euros a pair (article 700211). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The Sennheiser EU store page for article 700211 shows a different price, a different pair quantity, or drops the Momentum Wireless 4 or 5.

iFixit's Momentum 4 ear pad guide rates the swap very easy at about 20 seconds. The guide says to pry each pad off at the seam with a spudger (a thin pry tool). It then says to hook the new pad back into the speaker base. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

iFixit giving another rating or time, removing pads without prying at the seam with a spudger, or attaching without hooking the speaker base refutes this.

iFixit's Momentum 4 battery guide rates the job moderate at about 5 minutes. It says you reach the adhesive-held battery behind four 6.5 mm Phillips screws in the left driver (speaker part) housing, then unplug a white connector. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

iFixit's Momentum 4 battery guide skips the moderate or about-5-minute rating. Or it omits an adhesive-held battery, white plug, or four 6.5 mm left-driver-housing Phillips screws.

What are the best noise-cancelling headphones, and how does noise cancelling work?

Active noise cancelling uses tiny mics to cut steady low rumble mainly below 1,000 to 1,500 Hz (pitches). Blocking voices and clatter still takes a tight ear seal.

How Product.ai knows this5

Zhang and Qiu at Nanjing University measured a feedforward active noise control headset. With front noise, they report maximum active reduction is about 20 dB and bandwidth is mainly below 1,500 Hz. With side noise, they report maximum active reduction is about 12 dB and bandwidth is mainly below 1,000 Hz. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Zhang and Qiu report a non-feedforward headset. Or they report front or side maximum reduction or bandwidth other than about 20 dB, 1,500 Hz, 12 dB, or 1,000 Hz.

Devialet's patent background says headsets that cancel noise with an internal microphone work in a limited frequency range, typically 50 to 1,000 Hz. The patent background says this limit happens due to the instability of the feedback loop. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Devialet's patent background states a typical internal microphone range other than 50 to 1,000 Hz, or a cause other than feedback loop instability.

A 2017 report on CDC Stacks says ANC ear protectors mainly cut low-frequency noise at 500 Hz and below. The US Noise Reduction Rating (NRR, a passive ear-protection score) is measured with the electronics switched off. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The US Noise Reduction Rating is shown to be measured with the ANC electronics turned on.

In Audiology Research, Ausili and colleagues cite acoustic measurements of commercial hearables (smart earbuds) using transparency features (modes that let outside sound in). They report that those measurements found processing delays ranging from 0 to 9.7 ms (milliseconds). They also report that some devices showed channel asymmetries (timing gaps between the left and right ears) up to 9.5 ms. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The Audiology Research text or cited tests giving hearable transparency delays other than 0 to 9.7 ms, or asymmetries other than up to 9.5 ms.

Rivera Benois, Nowak, and Zölzer write that outside feedforward and inside feedback ANC microphones each have limits. Combining both into a hybrid ANC system helps offset the limits of each one. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The paper calls feedforward and feedback ANC substitutes or says a hybrid system adds nothing.

Should you get over-ear, on-ear, open-back, or in-ear headphones?

Each shape trades off weight, ear seal, and low-frequency output. Open dynamic models can weigh 260 g. Planar magnetic (flat speaker) models reach 595 g. Any air leak under an ear cup cuts low- and mid-frequency noise blocking.

How Product.ai knows this5

Audeze lists its LCD-2 planar magnetic headphone at 595g, with 106 mm transducers and a sensitivity of 101 dB/1mW (at Drum Reference Point). Audeze also lists a minimum power requirement of >100mW and a recommended power level of >250mW. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Audeze lists LCD-2 weight, transducer, sensitivity, or power figures other than 595g, 106 mm, 101 dB/1mW (at Drum Reference Point), >100mW minimum, or >250mW recommended.

Sennheiser lists the HD 600 at 260 g with an open, dynamic transducer principle. Sennheiser also lists a 97 dB sound pressure level at 1 V and a 300 ohm impedance (opposition to alternating electric current). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Sennheiser's HD 600 page lists a weight other than 260 g or a transducer principle other than dynamic, open. Or it lists an SPL other than 97 dB at 1 V or an impedance other than 300 ohms.

Wolfgang Klippel's paper says Xmax is the maximal linear peak displacement of the voice coil (the coil that moves the speaker's diaphragm). It says Xmax shows the maximum displaced air volume, which limits maximal sound pressure output at low frequencies. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Klippel's paper saying Xmax does not show the maximum displaced air volume would show this wrong. So would it saying this volume does not limit maximal sound pressure output at low frequencies.

In the journal Work, Odell and Dorbala report that 16 participants wore 500 g to 600 g headsets for up to two hours. They report that heavier headsets were less comfortable for the lower quartile of participants (the quarter with the shortest comfortable wear time). This group averaged 11 fewer minutes of comfortable wear time per 33 g added. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Odell and Dorbala's Work study reports other than 16 participants wearing 500 g to 600 g headsets for up to two hours. Or heavier headsets were not less comfortable for the lower quartile of participants (the quarter with the shortest comfortable wear time). Or that quartile averaged other than 11 fewer minutes of comfortable wear time per 33 g added.

A 2004 Virginia Tech thesis by Jonathan Drapala Sides studied air leaks between an over-ear cup and the head. It found that an air leak strongly cuts low- and mid-frequency noise blocking. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Testing an over-ear cup finds that an air leak leaves low- and mid-frequency blocking unchanged.

How to choose

How do you choose headphones?

  1. What kind of noise is around you?

    Active noise cancelling cuts steady low rumble mainly below about 1,000 to 1,500 Hz. Blocking voices and clatter takes a tight seal from an ear pad or tip.

  2. How much weight and grip can you wear?

    A planar magnetic model (flat diaphragm speaker) can weigh 595 g. An open dynamic model (moving coil speaker) can weigh 260 g. Glasses frames can also loosen the ear-pad seal.

  3. Do you need multi device switching or Bluetooth LE Audio?

    Multi stream LE Audio needs a Bluetooth 5.2 or newer radio chip inside. A software update cannot add it to older earbuds.

  4. Can you swap out old ear pads and the battery?

    A UK survey of 3,811 wireless earbud owners found battery wear caused nearly a quarter of faults. Check if the pads snap off and the battery unplugs.

How Product.ai knows this8

Zhang and Qiu at Nanjing University measured a feedforward active noise control headset. With front noise, they report maximum active reduction is about 20 dB and bandwidth is mainly below 1,500 Hz. With side noise, they report maximum active reduction is about 12 dB and bandwidth is mainly below 1,000 Hz. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Zhang and Qiu report a non-feedforward headset. Or they report front or side maximum reduction or bandwidth other than about 20 dB, 1,500 Hz, 12 dB, or 1,000 Hz.

Devialet's patent background says headsets that cancel noise with an internal microphone work in a limited frequency range, typically 50 to 1,000 Hz. The patent background says this limit happens due to the instability of the feedback loop. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Devialet's patent background states a typical internal microphone range other than 50 to 1,000 Hz, or a cause other than feedback loop instability.

A 2017 report on CDC Stacks says ANC ear protectors mainly cut low-frequency noise at 500 Hz and below. The US Noise Reduction Rating (NRR, a passive ear-protection score) is measured with the electronics switched off. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The US Noise Reduction Rating is shown to be measured with the ANC electronics turned on.

Audeze lists its LCD-2 planar magnetic headphone at 595g, with 106 mm transducers and a sensitivity of 101 dB/1mW (at Drum Reference Point). Audeze also lists a minimum power requirement of >100mW and a recommended power level of >250mW. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Audeze lists LCD-2 weight, transducer, sensitivity, or power figures other than 595g, 106 mm, 101 dB/1mW (at Drum Reference Point), >100mW minimum, or >250mW recommended.

Sennheiser lists the HD 600 at 260 g with an open, dynamic transducer principle. Sennheiser also lists a 97 dB sound pressure level at 1 V and a 300 ohm impedance (opposition to alternating electric current). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Sennheiser's HD 600 page lists a weight other than 260 g or a transducer principle other than dynamic, open. Or it lists an SPL other than 97 dB at 1 V or an impedance other than 300 ohms.

The Bluetooth SIG's Core 5.2 overview says the Isochronous Adaptation Layer (ISOAL) is a new Bluetooth stack layer in the controller, above the link layer. It says ISOAL lets upper stack layers use isochronous (time-synced) data packet sizes different from the link layer's CIS (connected) or BIS (broadcast) transport sizes. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The Bluetooth SIG's Core 5.2 overview places ISOAL outside the controller, below the link layer, or not as a new stack layer. Or it says ISOAL requires upper stack layers and CIS or BIS link-layer transports to use matching isochronous packet sizes.

UK consumer group Which? surveyed 3,811 owners of in-ear wireless headphones in March 2025. Battery wear was the top fault and caused nearly a quarter of reported problems. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The Which? survey table shows a fault other than battery wear as the top issue.

A 2019 Apple patent says connector metal contacts are known to corrode in liquid electrolytes like sweat, particularly when held at an electrical bias (voltage). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The 2019 Apple patent text omits that connector metal contacts are known to corrode in liquid electrolytes like sweat, particularly at an electrical bias.

Are expensive headphones worth it?

A higher store price does not mean truer sound. A 2017 study of 283 headphones found no link between retail price and sound balance. Store markups and matching pairs of drivers (small speakers) make up much of the price.

How Product.ai knows this4

Jeroen Breebaart tested 283 headphones for a 2017 acoustics journal study. He found no link between retail price and measured sound response. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

A comparison study of similar size finds a strong link between retail price and measured sound response.

TechInsights found in a teardown that the Sennheiser Momentum True Wireless 2 earbuds cost $29.26 to make. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

A TechInsights teardown report for the same model gives a different total cost.

Audiophile Review wrote in January 2013 that retail pricing is typically 5X the manufacturer's production cost. It says at least 50% of the price is likely given to the dealer as a discount for stocking the product. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

A published price breakdown for audio gear showing retail well under 5X production cost, or a dealer stocking discount well under 50%.

Sonarworks writes that to end unit-to-unit differences, a headphone maker would need to throw away drivers that fall out of spec and pick matching ones. In Sonarworks's example, throwing away 10 drivers to use only 2 means the buyer pays for 12. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Sonarworks writes that ending unit-to-unit differences would not need throwing away out-of-spec drivers or picking matching ones. Or its example uses numbers other than 10 thrown away, 2 used, or 12 paid for.

Should you get wired or wireless headphones, and do Bluetooth codecs matter?

Standard Bluetooth uses lossy audio compression (squeezing the audio stream by dropping some detail). Your body also weakens the radio link between a pocket and your ears. Even though Sony's LDAC Bluetooth format reaches up to 990 kbps, 660 kbps appears to be the most common setting among the phones SoundGuys tested. Only one tested phone defaulted to 990 kbps.

How Product.ai knows this6

Zhekov, Mikkelsen and Pedersen of Aalborg University measured five Bluetooth earbuds in free space (open air) and in a person's ear with 12 volunteers. The authors report a mean deterioration in total radiated power (overall sent radio power) from placing the earbud in the ear. Across the tested earbuds, this mean deterioration ranges from 3 to 6 dB (a log scale where 3 dB is about half the power). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The paper reports testing a number of Bluetooth earbuds other than five, or volunteers other than 12. Or it reports a mean in-ear total radiated power deterioration range other than 3 to 6 dB compared with free space.

Sony's help guide for the WH-CH510 says a person's body between the headset and phone can cause sound dropouts. Sony advises keeping the headset and phone close together. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Sony's WH-CH510 guide does not list a human body as a cause of Bluetooth dropouts.

SoundGuys measured Bluetooth link strength (RSSI, received radio power) from a pocket to the ear for a selection of headphones. It reports that its worst performers were true wireless earbuds, which hit -63dB (a decibel scale where more negative numbers mean weaker radio power). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The SoundGuys article shows a setup other than pocket to ear RSSI. Or it shows worst performers other than true wireless earbuds, or a worst reading other than -63dB.

SoundGuys tested which LDAC bitrate several smartphones default to and found that only the LG V30+ defaulted to 990 kbps. SoundGuys reports that 660 kbps appears to be the most common Best Effort setting in its test. SoundGuys adds that a phone is unlikely to opt for 990 kbps LDAC unless the user forces it in the developer options. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

SoundGuys reporting a 990 kbps default besides only the LG V30+ or a most common Best Effort setting besides 660 kbps would show this wrong. So would SoundGuys reporting that phones are likely to pick 990 kbps without forcing it in developer options.

An August 2021 TIRIAS Research paper hosted by Qualcomm says Bluetooth could not then deliver lossless audio. The paper says all Bluetooth connections to that date used lossy compression. The paper adds Qualcomm had announced plans to scale aptX Adaptive to lossless CD resolution over Bluetooth with Snapdragon Sound. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

This is wrong if the August 2021 Qualcomm-hosted TIRIAS Research paper says Bluetooth then delivered lossless audio. It is also wrong if that paper says any Bluetooth connection to that date avoided lossy compression. It is also wrong if that paper omits Qualcomm's announced plans to scale aptX Adaptive to lossless CD resolution over Bluetooth with Snapdragon Sound.

Sony's LDAC page says LDAC meets the Hi-Res Audio Wireless rule at 990 kbps, and switches automatically between 330, 660, and 990 kbps. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29

What would prove this wrong

Sony's LDAC page states a different top bitrate or does not list the 330, 660, and 990 kbps steps.

Which headphone reviews, graphs, and specs can you trust?

Skip printed total harmonic distortion (THD, extra unwanted tones from a driver) numbers on the box. Check multi-seat sound graphs below 7 kHz. Test at normal volume, because loud demos make bass sound fuller.

How Product.ai knows this3

RTINGS reports on experiments by Temme and colleagues where headphones were matched to one frequency response target (a common balance of bass to treble). Listeners did not always rate headphones with higher total harmonic distortion (THD, extra unwanted tones) worse. RTINGS adds that listeners still preferred some headphones with higher THD at low frequencies (bass). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The RTINGS article or the Temme experiments show headphones were not matched to a common target, or listeners always rated higher-THD or bass-THD headphones worse.

Allion Labs found that small shifts in fit cause big changes in high-frequency sound. Allion reseats each headphone five times and drops tones above 7 kHz from its balance check. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Repeated fit tests on one headphone show tones above 7 kHz shifting no more than below 2 kHz.

Thorvaldur Einarsson's 2003 University of Maryland thesis states that the perceived tone balance of music changes with listening volume. It adds that this is especially noticeable at low volume, where sounds below 500 Hz seem quieter. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

A listening test shows people hearing the same tone balance below 500 Hz at low and higher volumes with no compensation applied.

What a wrong pick costs

What does a wrong pick cost you?

A wireless headphone lasts only as long as its ear pads and battery. Below is how published warranty, replacement parts, and factory teardown figures compare across brands; unchecked trial, return, and support cells print 'Coming soon'.

Apple

Trial

Coming soon

Return

Coming soon

Support and parts

Coming soon

Bose

Trial

Coming soon

Return

Coming soon

Support and parts

Coming soon

Sennheiser

Trial

Coming soon

Return

Coming soon

Support and parts
Sennheiser's February 2026 consumer warranty page sends support claims to Sonova Holding AG.

New Momentum 4 and 5 ear pads cost 29.90 EUR a pair and pry off in 20 seconds. On the Momentum 4, four 6.5 mm Phillips screws open the left cup to unplug the battery.

Audio-Technica

Trial

Coming soon

Return

Coming soon

Support and parts

Audio-Technica's ATH-M50x studio headphones come with three detachable cords that unplug for easy swapping.

A TechInsights teardown put the parts and assembly cost of the Sennheiser Momentum True Wireless 2 earbuds at $29.26, and a January 2013 Audiophile Review column noted that headphone retail prices typically run about 5x manufacturing cost (with at least 50% going to the dealer discount). On battery lifespan, a March 2025 UK Which? survey of 3,811 wireless in-ear headphone owners found battery wear caused nearly a quarter of reported faults, and Futuresource Consulting reported in October 2025 that half of surveyed consumers would repair their headphones instead of replacing them (with 62% preferring a battery swap).

How Product.ai knows this13

Jeroen Breebaart tested 283 headphones for a 2017 acoustics journal study. He found no link between retail price and measured sound response. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

A comparison study of similar size finds a strong link between retail price and measured sound response.

TechInsights found in a teardown that the Sennheiser Momentum True Wireless 2 earbuds cost $29.26 to make. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

A TechInsights teardown report for the same model gives a different total cost.

Audiophile Review wrote in January 2013 that retail pricing is typically 5X the manufacturer's production cost. It says at least 50% of the price is likely given to the dealer as a discount for stocking the product. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

A published price breakdown for audio gear showing retail well under 5X production cost, or a dealer stocking discount well under 50%.

Sonarworks writes that to end unit-to-unit differences, a headphone maker would need to throw away drivers that fall out of spec and pick matching ones. In Sonarworks's example, throwing away 10 drivers to use only 2 means the buyer pays for 12. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Sonarworks writes that ending unit-to-unit differences would not need throwing away out-of-spec drivers or picking matching ones. Or its example uses numbers other than 10 thrown away, 2 used, or 12 paid for.

UK consumer group Which? surveyed 3,811 owners of in-ear wireless headphones in March 2025. Battery wear was the top fault and caused nearly a quarter of reported problems. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The Which? survey table shows a fault other than battery wear as the top issue.

A 2019 Apple patent says connector metal contacts are known to corrode in liquid electrolytes like sweat, particularly when held at an electrical bias (voltage). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The 2019 Apple patent text omits that connector metal contacts are known to corrode in liquid electrolytes like sweat, particularly at an electrical bias.

Futuresource Consulting reported in October 2025 that half of consumers said they would repair their headphones instead of replacing them. In the same report, 62% preferred to replace a dead battery instead of replacing the whole headset. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29

What would prove this wrong

Futuresource Consulting's October 2025 report gives a different share of consumers who want headphone repairs or battery swaps.

Sennheiser's February 2026 warranty page tells owners of Sennheiser consumer headphones to contact Sonova Holding AG. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The warranty page at that URL no longer tells consumer headphone owners to contact Sonova Holding AG.

Sonova announced on March 1, 2022 that it had closed its buyout of the Sennheiser Consumer Division. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Sonova's March 1, 2022 release does not say the Sennheiser Consumer Division buyout closed.

Sennheiser's EU store lists ear pads for the Momentum Wireless 4 and 5 at 29,90 euros a pair (article 700211). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The Sennheiser EU store page for article 700211 shows a different price, a different pair quantity, or drops the Momentum Wireless 4 or 5.

iFixit's Momentum 4 ear pad guide rates the swap very easy at about 20 seconds. The guide says to pry each pad off at the seam with a spudger (a thin pry tool). It then says to hook the new pad back into the speaker base. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

iFixit giving another rating or time, removing pads without prying at the seam with a spudger, or attaching without hooking the speaker base refutes this.

iFixit's Momentum 4 battery guide rates the job moderate at about 5 minutes. It says you reach the adhesive-held battery behind four 6.5 mm Phillips screws in the left driver (speaker part) housing, then unplug a white connector. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

iFixit's Momentum 4 battery guide skips the moderate or about-5-minute rating. Or it omits an adhesive-held battery, white plug, or four 6.5 mm left-driver-housing Phillips screws.

Audio-Technica's ATH-M50x product page says the headphones come with three detachable cords that unplug for easy swapping. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29

What would prove this wrong

Audio-Technica's ATH-M50x page lists a fixed cable or fewer than three detachable cords.

How long do headphones last, and why does one earbud die first?

Battery wear is the top fault in wireless earbuds. Fast charging and heat make batteries wear out faster. In older Bluetooth designs, one main earbud links to your phone and sends sound to the other. That main earbud drains faster.

How Product.ai knows this6

Tomaszewska and co-authors wrote in 2019 that high fast-charging currents speed up capacity loss in lithium-ion batteries. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Cycle tests show cells charged at high current losing capacity no faster than at low current.

In February 2025, the University of Texas at Austin's Cockrell School reported a finding by Yijin Liu's team on earbud parts. The report says the team found parts such as the Bluetooth antenna, microphones, and circuits clashed with the battery. According to the report, this clash produced different temperatures at the battery's top and bottom portions, which damaged it. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

This is wrong if the February 2025 Cockrell School report says the battery stayed at an even temperature from top to bottom. It is also wrong if the report says the parts did not clash, the clash did no damage, or another team found this.

Panasonic's Technics support page says one earbud often holds the phone link and relays sound to the other earbud. That main earbud uses more power and drains its battery faster. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

Panasonic's support page states that both earbuds use the same power.

The Bluetooth SIG wrote in January 2020 that LE Audio will let a smartphone stream separately synchronized left and right channel streams to each earbud. The SIG added that most true wireless designs then streamed stereo to a single earbud. That earbud separated the channels and streamed one of them to the other earbud. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The Bluetooth SIG January 2020 post states LE Audio smartphone streaming other than separate synchronized left and right earbud streams. Or it describes most prior designs other than streaming stereo to one earbud that splits and relays a channel.

UK consumer group Which? surveyed 3,811 owners of in-ear wireless headphones in March 2025. Battery wear was the top fault and caused nearly a quarter of reported problems. source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The Which? survey table shows a fault other than battery wear as the top issue.

A 2019 Apple patent says connector metal contacts are known to corrode in liquid electrolytes like sweat, particularly when held at an electrical bias (voltage). source

Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27

What would prove this wrong

The 2019 Apple patent text omits that connector metal contacts are known to corrode in liquid electrolytes like sweat, particularly at an electrical bias.

Questions coming soon

Shoppers ask these questions too, and they are in the Product.ai research queue for source checking, so this page does not answer them yet.

  • What are the best headphones for working out and running?
  • What are the best gaming headphones?
  • What are the best headphones for sleeping?
  • What are the best headphones for kids?
  • What are the best headphones for phone calls and office work?
  • How do bone conduction and open-ear headphones work?
  • Are headphones bad for your ears, and what is a safe volume?
  • Is it illegal to drive with headphones on?

How this page knows

How findings on this page were made and checked

Product.ai uses axiomatic intelligence to turn a category into small, testable findings. The method's aim is that each finding rests on a primary source, which is the party that issued the fact, and carries a falsifier, which is the result that would prove the finding wrong so a reader can test it. Each page says how far it meets that aim. Read the general explanation of axiomatic intelligence

  1. 1

    Primary-source evidence

    The aim is that each finding rests on a primary source, which is the party that issued the fact. Each page says how far it meets that aim.

    Sources include a 283-headphone acoustics study, lab teardowns and tests from TechInsights, RTINGS, SoundGuys, Allion Labs and iFixit, patents, Bluetooth SIG rules, and Apple, Bose, Sennheiser and Audeze pages.
  2. 2

    Source check

    When a source check runs, it traces each finding's numbers and mechanism to its cited source. Partial findings show only the part the source supports.

    The 30 findings were checked against their sources on October 16, 2026, and all 30 passed the source check. None of the 30 rests on primary sources in every detail. A person reviewed all 44 readings on this page against their sources on October 27, 2026.
  3. 3

    Falsifier and open gaps

    Findings carry the result that would prove them wrong so a reader can test them. Questions the record cannot answer are listed as not yet answered instead of guessed.

    All 30 findings name what would prove them wrong, and 8 questions shoppers ask are not yet answered on this page.
Last source check
October 16, 2026
Open questions and brands
8 questions not yet answered; 8 more brands not yet checked
Links and payment
This page has no affiliate links.
A finding is one fact about headphones from Product.ai's primary source research. Each finding names its source and the test result that would prove it wrong.

Numbered sources

  1. 1Breebaart (2017), Journal of the Acoustical Society of America study of 283 headphones finding no link between price and sound response, and Applied Acoustics active noise-cancelling headset study (2014) (checked Oct 16, 2026).
  2. 2RTINGS Sony WH-1000XM5 vs. Sennheiser Momentum 4 test, Bose QuietComfort Ultra (2nd Gen) release, Apple Support Adaptive Audio page, SoundGuys Anker Soundcore Space One report, Beyerdynamic German manufacturing page, and Audio-Technica ATH-M50x product page (checked Oct 16, 2026).
  3. 3TNW (Napier Lopez) test of glasses loosening the ear-pad seal on a headphone test rig, and Jonathan Drapala Sides (2004) Virginia Tech thesis on ear-cup air leaks cutting low- and mid-frequency noise blocking (checked Oct 16, 2026).
  4. 4Sennheiser Momentum 4 Wireless iFixit battery replacement guide (checked Oct 16, 2026).

Method notes from this page

A finding is one fact about headphones from Product.ai's primary source research. Each finding names its source and the test result that would prove it wrong.

Product.ai gets findings from published sound studies, outside lab tests, patents, and official brand support pages.

Sources & check record

51 reviewed readings behind this page, sourced and dated

Source check on Oct 16, 2026 · Zero affiliate links

Sources & check record

Sources & check record

51 reviewed readings behind this page, sourced and dated

Each row is one reviewed reading with its source link, quote, who checked and reviewed it and when, its falsifier, and the parts of this page that cite it.

ReadingSourceQuoteCheck recordWhat would prove this wrongResearch areaCited in
Jeroen Breebaart tested 283 headphones for a 2017 acoustics journal study. He found no link between retail price and measured sound response.The Journal of the Acoustical Society of America (2017-06-06)“no correlation could be observed between the measured magnitude response and retail price of headphones”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27A comparison study of similar size finds a strong link between retail price and measured sound response.Research area Price and manufacturingCited in The category answer, Are expensive headphones worth it?, What a wrong pick costs
Zhang and Qiu at Nanjing University measured a feedforward active noise control headset. With front noise, they report maximum active reduction is about 20 dB and bandwidth is mainly below 1,500 Hz. With side noise, they report maximum active reduction is about 12 dB and bandwidth is mainly below 1,000 Hz.Applied Acoustics (Elsevier), accepted manuscript hosted by University of Technology Sydney (2014)“For active noise control, the maximum noise reduction is about 20 dB, the attenuation bandwidth is mainly below 1500 Hz and the overall noise reduction is about 12.2 dB ... For active noise control, the maximum noise reduction is about 12 dB, the attenuation bandwidth is mainly below 1000 Hz and the overall noise reduction is about 5.6 dB”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Zhang and Qiu report a non-feedforward headset. Or they report front or side maximum reduction or bandwidth other than about 20 dB, 1,500 Hz, 12 dB, or 1,000 Hz.Research area Noise cancellingCited in Best for whom, What are the best noise-cancelling headphones, and how does noise cancelling work?, How to choose
Devialet's patent background says headsets that cancel noise with an internal microphone work in a limited frequency range, typically 50 to 1,000 Hz. The patent background says this limit happens due to the instability of the feedback loop.Devialet SA, United States patent US11678105B2 (2023-06-13)“in a limited frequency range, typically 50-1000 Hz, due to the instability of the feedback loop”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Devialet's patent background states a typical internal microphone range other than 50 to 1,000 Hz, or a cause other than feedback loop instability.Research area Noise cancellingCited in Best for whom, What are the best noise-cancelling headphones, and how does noise cancelling work?, How to choose
A 2017 report on CDC Stacks says ANC ear protectors mainly cut low-frequency noise at 500 Hz and below. The US Noise Reduction Rating (NRR, a passive ear-protection score) is measured with the electronics switched off.NHCA Spectrum (National Hearing Conservation Association), hosted on CDC Stacks (2017-07)“Devices with ANC technology are designed to increase the level of protection by actively reducing the level of low-frequency noise (typically at 500 Hz and below). ... NRR only describes the passive performance HPDs, which in the case of ANC devices, means when the electronics are turned off.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The US Noise Reduction Rating is shown to be measured with the ANC electronics turned on.Research area Noise cancellingCited in Best for whom, What are the best noise-cancelling headphones, and how does noise cancelling work?, How to choose
Apple's June 2023 announcement says Adaptive Audio is a new listening mode on AirPods Pro (2nd generation). The announcement says it dynamically blends (mixes in real time) Transparency mode (letting outside sound in) and Active Noise Cancellation (blocking outside sound).Apple Newsroom (2023-06-05)“Adaptive Audio is a new listening mode on AirPods Pro (2nd generation)”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Apple's June 2023 announcement does not call Adaptive Audio a new listening mode on AirPods Pro (2nd generation). Or the announcement does not say it dynamically blends Transparency mode and Active Noise Cancellation.Research area Brand record (Apple)Cited in Best for whom, Names to start with
Apple's support page lists Adaptive Audio for AirPods 4 (ANC), AirPods 5, AirPods Pro 2 and 3, and AirPods Max 2. Using the mode requires current iOS or iPadOS software.Apple Support (2026-09-14)“If you have AirPods 4 (ANC), AirPods 5 (both models), AirPods Pro 2, AirPods Pro 3, or AirPods Max 2 and the latest version of iOS or iPadOS, you can also use Adaptive Audio”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Apple's support page 108918 lists different AirPods models or drops the iOS and iPadOS rule.Research area Brand record (Apple)Cited in Best for whom, Names to start with
In the journal Work, Odell and Dorbala report that 16 participants wore 500 g to 600 g headsets for up to two hours. They report that heavier headsets were less comfortable for the lower quartile of participants (the quarter with the shortest comfortable wear time). This group averaged 11 fewer minutes of comfortable wear time per 33 g added.Work (IOS Press), abstract as indexed by Europe PMC (2024)“Sixteen study participants wore four otherwise identical headsets weighted between 500g-600 g for up to two hours each in an office environment. ... Heavier headsets were less comfortable for the lower quartile of participants -yielding an average of 11 fewer minutes of comfortable wear time per 33 g of weight added.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Odell and Dorbala's Work study reports other than 16 participants wearing 500 g to 600 g headsets for up to two hours. Or heavier headsets were not less comfortable for the lower quartile of participants (the quarter with the shortest comfortable wear time). Or that quartile averaged other than 11 fewer minutes of comfortable wear time per 33 g added.Research area Best-for-whom fitCited in Best for whom, Should you get over-ear, on-ear, open-back, or in-ear headphones?
A 2004 Virginia Tech thesis by Jonathan Drapala Sides studied air leaks between an over-ear cup and the head. It found that an air leak strongly cuts low- and mid-frequency noise blocking.VTechWorks, Virginia Tech (2004-08-06)“The thesis is the first documented effort to show how the previously ignored air leak, known to exist between the ear cup and the head, has a profound effect on the low and mid frequency attenuation of a circumaural hearing defender.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Testing an over-ear cup finds that an air leak leaves low- and mid-frequency blocking unchanged.Research area Best-for-whom fitCited in Best for whom, Should you get over-ear, on-ear, open-back, or in-ear headphones?
Napier Lopez at TNW tested headphones on a rig with glasses frames breaking the ear-pad seal. The broken seal caused a large drop in bass compared with a tight seal.TNW (2022-05-25)“The red curve shows how the same headphones perform after placing a pair of glasses on the test rig for a loose seal.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Repeating the TNW rig test with glasses breaking the seal shows no bass drop.Research area Best-for-whom fitCited in Best for whom
Sennheiser's EU store lists ear pads for the Momentum Wireless 4 and 5 at 29,90 euros a pair (article 700211).Sonova Consumer Hearing GmbH (Sennheiser EU store) (undated)“Ear pads for MOMENTUM Wireless 4 and 5 (Pair). ... 29,90 € ... Article No. 700211”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The Sennheiser EU store page for article 700211 shows a different price, a different pair quantity, or drops the Momentum Wireless 4 or 5.Research area Brand record (Sennheiser)Cited in Best for whom, Names to start with, What a wrong pick costs
iFixit's Momentum 4 ear pad guide rates the swap very easy at about 20 seconds. The guide says to pry each pad off at the seam with a spudger (a thin pry tool). It then says to hook the new pad back into the speaker base.iFixit (2025-06-25)“Insert a spudger into the seam between the left ear pad and driver assembly. Gently pry around the perimeter of the ear pad until it fully releases.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27iFixit giving another rating or time, removing pads without prying at the seam with a spudger, or attaching without hooking the speaker base refutes this.Research area Brand record (Sennheiser)Cited in Best for whom, Names to start with, What a wrong pick costs
iFixit's Momentum 4 battery guide rates the job moderate at about 5 minutes. It says you reach the adhesive-held battery behind four 6.5 mm Phillips screws in the left driver (speaker part) housing, then unplug a white connector.iFixit (2026-06-24)“Use a Phillips #00 screwdriver to remove the four 6.5 mm screws that secure the left driver housing. ... Use tweezers to pull the white battery connector directly out of the daughterboard socket.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27iFixit's Momentum 4 battery guide skips the moderate or about-5-minute rating. Or it omits an adhesive-held battery, white plug, or four 6.5 mm left-driver-housing Phillips screws.Research area Brand record (Sennheiser)Cited in Best for whom, Names to start with, What a wrong pick costs
RTINGS compared the Sony WH-1000XM5 and Sennheiser Momentum 4 Wireless and found Sony's ANC blocked more noise. RTINGS found the Sennheiser more comfortable, better built, and able to run 62.3 hours against Sony's 27 hours.RTINGS.com (2026-08-06)“The Sony have a virtual soundstage feature, which can create a more immersive-sounding audio experience; their ANC system does a better job of blocking out background noise, and they support LDAC codec for Hi-Res audio. However, the Sennheiser are more comfortable, are better built, and have a significantly longer continuous playback time at 62.3 hours compared to the Sony's 27 hours.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27RTINGS's compare page says the Sennheiser block noise as well as or better than the Sony.Research area Brand record (Sennheiser)Cited in Names to start with
RTINGS says the Bose QuietComfort Ultra are more comfortable and better built than the Sony WH-1000XM5, with a slight edge in noise blocking. RTINGS calls the noise gap minor and says both work well in loud places.RTINGS.com (2026-07-02)“The Bose QuietComfort Ultra Headphones Wireless have the edge over the Sony WH-1000XM5 Wireless. The Bose are more comfortable and better built. They also have a slight edge in noise isolation, but the difference is minor; both choices are still well-suited for noisy environments.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29RTINGS's WH-1000XM5 review calls the noise gap large or ranks Sony ahead of Bose on comfort and build.Research area Brand record (Bose)Cited in Names to start with
Bose's support page for the QuietComfort Ultra Headphones calls Aware mode full transparency with stereo sound. The mode lets you hear your surroundings while music plays.Bose (undated)“Aware mode ... Full transparency with Bose-optimized stereo audio. ... Allows you to hear your surroundings while enjoying your audio in stereo.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Bose's support page describes Aware mode as something other than full transparency.Research area Brand record (Bose)Cited in Names to start with
Bose's support page for the QuietComfort Ultra Earbuds (2nd Gen) explains ActiveSense in Aware mode. It says ActiveSense automatically turns noise cancellation on during sudden or loud nearby noises, and off when the noise stops.Bose (undated)“Aware Mode with ActiveSense™ allows the earbuds to automatically turn on noise cancellation when sudden or loud noises occur near you ... Once the noise stops, noise cancellation automatically turns off again.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Bose's support page says ActiveSense in Aware mode does not automatically turn noise cancellation on for sudden or loud nearby noises and off afterward.Research area Brand record (Bose)Cited in Names to start with
Bose's September 2025 press release lists the QuietComfort Ultra Headphones (2nd Gen) at $449 with up to 30 hours of play time per charge. Bose also lists up to 23 hours with Immersive Audio on, and up to 45 hours with noise cancelling off.Bose (2025-09-10)“Retailing for $449 ... improved battery life with up to 30 hours (23 with Immersive Audio on, 45 with ANC turned off) of play time”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Bose's September 2025 release lists a price besides $449 or play times besides 30 hours, 23 (Immersive Audio on), and 45 (noise cancelling off).Research area Brand record (Bose)Cited in Names to start with
Bose's pressroom says Bose introduced the original QuietComfort Acoustic Noise Cancelling headphones in 2000. It says this came 22 years after Dr. Amar Bose's original noise cancellation research.Bose (2015-07-20)“In 2000, 22 years after Dr. Amar Bose's original noise cancellation research, Bose introduced the original QuietComfort Acoustic Noise Cancelling® headphones, forever changing the consumer headphone category.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Bose's pressroom gives a launch year other than 2000 for the original QuietComfort headphones, or dates the original research to other than 22 years earlier.Research area Brand record (Bose)Cited in Names to start with
Apple Support says automatic device switching requires the latest operating systems on all devices and the same Apple Account using two-factor authentication. Apple lists AirPods 2 and later, all AirPods Pro, and all AirPods Max as supporting this.Apple Support (2026-10-07)“To switch between devices automatically, update all your devices to the latest versions of their operating systems ... sign in to your devices with the same Apple Account using two-factor authentication.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Apple's support page drops the latest-software, same-Apple-Account, or two-factor-authentication requirements, or lists a different set of supported AirPods models.Research area Brand record (Apple)Cited in Names to start with
NBC Select reporter Harry Rabinowitz wrote in his November 2025 guide to headphones under $100 that his favorite budget picks come from Sony, Soundcore, and JLab.NBC Select (2025-11-20)“Some of my favorite budget-friendly options come from Sony, Soundcore and Jlab.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29NBC Select's November 2025 under-$100 headphones guide names no Soundcore model among its picks.Research area Brand record (Soundcore)Cited in Names to start with
SoundGuys reported on March 26, 2026 that the Anker Soundcore Space One wireless headphones were on sale for $69, down from their regular $99 price.SoundGuys (2026-03-26)“The Anker Soundcore Space One is down to $69 from its usual $99, which is close to the lowest price we’ve ever seen.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29SoundGuys' March 26, 2026 article gives a regular price other than $99 or a sale price other than $69 for the Space One.Research area Brand record (Soundcore)Cited in Names to start with
Soundcore's support page says LDAC works only on devices with Android 8.0 or newer. Turning LDAC on also uses more battery power and shortens overall play time.soundcore (service.soundcore.com) (undated)“Only devices with Android 8.0 or later support LDAC. ... The LDAC codec processing will increase power consumption and decrease overall playtime.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29Soundcore's support page states that LDAC works on Android versions before 8.0 or does not reduce overall play time.Research area Brand record (Soundcore)Cited in Names to start with
Beyerdynamic's company blog post from December 7, 2023 says 85% of the headphones and microphones it sells are made in Germany.beyerdynamic (company blog) (2023-12-07)“85% of the headphones and microphones we sell are manufactured in Germany”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29Beyerdynamic's December 2023 blog post states a share made in Germany other than 85%.Research area Brand record (Beyerdynamic)Cited in Names to start with
Audio-Technica's ATH-M50x product page says the headphones come with three detachable cords that unplug for easy swapping.オーディオテクニカ (Audio-Technica) (undated)“利用シーンに合わせて選べる3本の着脱コードが付属しています。”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29Audio-Technica's ATH-M50x page lists a fixed cable or fewer than three detachable cords.Research area Brand record (Audio-Technica)Cited in Names to start with, What a wrong pick costs
In Audiology Research, Ausili and colleagues cite acoustic measurements of commercial hearables (smart earbuds) using transparency features (modes that let outside sound in). They report that those measurements found processing delays ranging from 0 to 9.7 ms (milliseconds). They also report that some devices showed channel asymmetries (timing gaps between the left and right ears) up to 9.5 ms.Audiology Research (MDPI) (2025-04-25)“The deviations from natural hearing included processing delays ranging from 0 to 9.7 ms, with some devices showing left-right channel asymmetries up to 9.5 ms, and frequency response deviations of up to 15 dB relative to the open-ear configuration.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The Audiology Research text or cited tests giving hearable transparency delays other than 0 to 9.7 ms, or asymmetries other than up to 9.5 ms.Research area Noise cancellingCited in What are the best noise-cancelling headphones, and how does noise cancelling work?
Rivera Benois, Nowak, and Zölzer write that outside feedforward and inside feedback ANC microphones each have limits. Combining both into a hybrid ANC system helps offset the limits of each one.Helmut Schmidt University (Rivera Benois, Nowak, Zölzer) (undated)“The classical feedforward and feedback active noise control structures can be combined in pairs into hybrid control systems, in order to partially compensate for their individual limitations.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The paper calls feedforward and feedback ANC substitutes or says a hybrid system adds nothing.Research area Noise cancellingCited in What are the best noise-cancelling headphones, and how does noise cancelling work?
Audeze lists its LCD-2 planar magnetic headphone at 595g, with 106 mm transducers and a sensitivity of 101 dB/1mW (at Drum Reference Point). Audeze also lists a minimum power requirement of >100mW and a recommended power level of >250mW.Audeze (undated)“Weight: 595g ... Sensitivity: 101 dB/1mW (at Drum Reference Point) ... Recommended power level: >250mW ... Minimum power requirement: >100mW ... Transducer size: 106 mm”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Audeze lists LCD-2 weight, transducer, sensitivity, or power figures other than 595g, 106 mm, 101 dB/1mW (at Drum Reference Point), >100mW minimum, or >250mW recommended.Research area Form factors and driversCited in Should you get over-ear, on-ear, open-back, or in-ear headphones?, How to choose
Sennheiser lists the HD 600 at 260 g with an open, dynamic transducer principle. Sennheiser also lists a 97 dB sound pressure level at 1 V and a 300 ohm impedance (opposition to alternating electric current).Sennheiser (undated)“Weight: 260 g ... Sound pressure level (SPL): 97 dB (1 V) ... Impedance: 300 Ω ... Transducer principle: dynamic, open”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Sennheiser's HD 600 page lists a weight other than 260 g or a transducer principle other than dynamic, open. Or it lists an SPL other than 97 dB at 1 V or an impedance other than 300 ohms.Research area Form factors and driversCited in Should you get over-ear, on-ear, open-back, or in-ear headphones?, How to choose
Wolfgang Klippel's paper says Xmax is the maximal linear peak displacement of the voice coil (the coil that moves the speaker's diaphragm). It says Xmax shows the maximum displaced air volume, which limits maximal sound pressure output at low frequencies.Klippel GmbH (undated)“One of them is the maximal (linear) peak displacement Xmax showing the maximum of displaced air volume which limits the maximal sound pressure output at low frequencies as shown in Fig. 1.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Klippel's paper saying Xmax does not show the maximum displaced air volume would show this wrong. So would it saying this volume does not limit maximal sound pressure output at low frequencies.Research area Form factors and driversCited in Should you get over-ear, on-ear, open-back, or in-ear headphones?
The Bluetooth SIG's Core 5.2 overview says the Isochronous Adaptation Layer (ISOAL) is a new Bluetooth stack layer in the controller, above the link layer. It says ISOAL lets upper stack layers use isochronous (time-synced) data packet sizes different from the link layer's CIS (connected) or BIS (broadcast) transport sizes.Bluetooth SIG (2020-01-06)“ISOAL is a new layer in the Bluetooth stack which sits in the controller above the link layer. It provides flexibility in the way that lower layers of the stack and upper layers work together, allowing the size of isochronous data packets as created and consumed by upper stack layers to be different to the size used by the CIS or BIS logical transport in the link layer.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The Bluetooth SIG's Core 5.2 overview places ISOAL outside the controller, below the link layer, or not as a new stack layer. Or it says ISOAL requires upper stack layers and CIS or BIS link-layer transports to use matching isochronous packet sizes.Research area How to chooseCited in How to choose
UK consumer group Which? surveyed 3,811 owners of in-ear wireless headphones in March 2025. Battery wear was the top fault and caused nearly a quarter of reported problems.Which? (2026-08-03)“deterioration of the battery is the most common fault, accounting for nearly a quarter of issues with in-ear headphones.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The Which? survey table shows a fault other than battery wear as the top issue.Research area Battery and lifespanCited in How to choose, What a wrong pick costs, How long do headphones last, and why does one earbud die first?
A 2019 Apple patent says connector metal contacts are known to corrode in liquid electrolytes like sweat, particularly when held at an electrical bias (voltage).Apple Inc. (2019-07-09)“These metal contacts are known to corrode in the presence of liquid electrolytes, particularly when held at an electrical bias”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The 2019 Apple patent text omits that connector metal contacts are known to corrode in liquid electrolytes like sweat, particularly at an electrical bias.Research area Battery and lifespanCited in How to choose, What a wrong pick costs, How long do headphones last, and why does one earbud die first?
TechInsights found in a teardown that the Sennheiser Momentum True Wireless 2 earbuds cost $29.26 to make.TechInsights (undated)“The Sennheiser Momentum True Wireless 2 M3IETW2 audio headset has a total cost of $29.26”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27A TechInsights teardown report for the same model gives a different total cost.Research area Price and manufacturingCited in Are expensive headphones worth it?, What a wrong pick costs
Audiophile Review wrote in January 2013 that retail pricing is typically 5X the manufacturer's production cost. It says at least 50% of the price is likely given to the dealer as a discount for stocking the product.Audiophile Review (2013-01-10)“is just, typically, 5X the manufacturer’s cost of production ... at least 50% of it is likely to be given as a discount to the dealer for stocking the product”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27A published price breakdown for audio gear showing retail well under 5X production cost, or a dealer stocking discount well under 50%.Research area Price and manufacturingCited in Are expensive headphones worth it?, What a wrong pick costs
Sonarworks writes that to end unit-to-unit differences, a headphone maker would need to throw away drivers that fall out of spec and pick matching ones. In Sonarworks's example, throwing away 10 drivers to use only 2 means the buyer pays for 12.Sonarworks (2016-12-01)“the manufacturer of your headphones would need to throw away drivers that fall out of spec and cherrypick drivers so they at least match each other ... if they have to bin 10 drivers, before your cans take shape, you’re paying for 12 drivers even if you need only 2.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Sonarworks writes that ending unit-to-unit differences would not need throwing away out-of-spec drivers or picking matching ones. Or its example uses numbers other than 10 thrown away, 2 used, or 12 paid for.Research area Price and manufacturingCited in Are expensive headphones worth it?, What a wrong pick costs
Zhekov, Mikkelsen and Pedersen of Aalborg University measured five Bluetooth earbuds in free space (open air) and in a person's ear with 12 volunteers. The authors report a mean deterioration in total radiated power (overall sent radio power) from placing the earbud in the ear. Across the tested earbuds, this mean deterioration ranges from 3 to 6 dB (a log scale where 3 dB is about half the power).International Journal of Antennas and Propagation (Hindawi); Aalborg University repository copy (2021-05-20)“Measurements show that the mean performance deterioration, due to the placement of the earbud in the person’s ear, ranges from 3 to 6 dB across the tested earbuds.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The paper reports testing a number of Bluetooth earbuds other than five, or volunteers other than 12. Or it reports a mean in-ear total radiated power deterioration range other than 3 to 6 dB compared with free space.Research area Wireless and BluetoothCited in Should you get wired or wireless headphones, and do Bluetooth codecs matter?
Sony's help guide for the WH-CH510 says a person's body between the headset and phone can cause sound dropouts. Sony advises keeping the headset and phone close together.Sony Corporation (2019)“Bluetooth communications may be disabled, or noise or audio dropout may occur under the following conditions. ... When there is a human body between the headset and the Bluetooth device ... Use this headset and the Bluetooth device as near to each other as possible.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Sony's WH-CH510 guide does not list a human body as a cause of Bluetooth dropouts.Research area Wireless and BluetoothCited in Should you get wired or wireless headphones, and do Bluetooth codecs matter?
SoundGuys measured Bluetooth link strength (RSSI, received radio power) from a pocket to the ear for a selection of headphones. It reports that its worst performers were true wireless earbuds, which hit -63dB (a decibel scale where more negative numbers mean weaker radio power).SoundGuys (2025-10-01)“The graph also plots the best, worst, and average RSSI for a selection of Bluetooth headphones, measured from the pocket to ear. Unsurprisingly, our worst performers are true wireless earbuds that hit -63dB.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The SoundGuys article shows a setup other than pocket to ear RSSI. Or it shows worst performers other than true wireless earbuds, or a worst reading other than -63dB.Research area Wireless and BluetoothCited in Should you get wired or wireless headphones, and do Bluetooth codecs matter?
SoundGuys tested which LDAC bitrate several smartphones default to and found that only the LG V30+ defaulted to 990 kbps. SoundGuys reports that 660 kbps appears to be the most common Best Effort setting in its test. SoundGuys adds that a phone is unlikely to opt for 990 kbps LDAC unless the user forces it in the developer options.SoundGuys (2025-10-01)“Smartphones rarely pick the 990kbps option when connecting to LDAC equipment.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27SoundGuys reporting a 990 kbps default besides only the LG V30+ or a most common Best Effort setting besides 660 kbps would show this wrong. So would SoundGuys reporting that phones are likely to pick 990 kbps without forcing it in developer options.Research area Wireless and BluetoothCited in Should you get wired or wireless headphones, and do Bluetooth codecs matter?
An August 2021 TIRIAS Research paper hosted by Qualcomm says Bluetooth could not then deliver lossless audio. The paper says all Bluetooth connections to that date used lossy compression. The paper adds Qualcomm had announced plans to scale aptX Adaptive to lossless CD resolution over Bluetooth with Snapdragon Sound.TIRIAS Research (2021-08)“Bluetooth cannot currently deliver lossless audio: all Bluetooth connections to date employ lossy compression based on psychoacoustic masking techniques ... Qualcomm has also recently announced their intention to support aptX Adaptive scaling all the way to lossless CD resolution over Bluetooth with Snapdragon Sound.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27This is wrong if the August 2021 Qualcomm-hosted TIRIAS Research paper says Bluetooth then delivered lossless audio. It is also wrong if that paper says any Bluetooth connection to that date avoided lossy compression. It is also wrong if that paper omits Qualcomm's announced plans to scale aptX Adaptive to lossless CD resolution over Bluetooth with Snapdragon Sound.Research area Wireless and BluetoothCited in Should you get wired or wireless headphones, and do Bluetooth codecs matter?
Sony's LDAC page says LDAC meets the Hi-Res Audio Wireless rule at 990 kbps, and switches automatically between 330, 660, and 990 kbps.Sony Corporation (undated)“(*1) LDAC satisfies the requirement of "Hi-Res Audio Wireless" logo at the transfer rate of 990 kbps ... The bitrate automatically changes among 330kbps/660kbps/990kbps”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29Sony's LDAC page states a different top bitrate or does not list the 330, 660, and 990 kbps steps.Research area Wireless and BluetoothCited in Should you get wired or wireless headphones, and do Bluetooth codecs matter?
RTINGS reports on experiments by Temme and colleagues where headphones were matched to one frequency response target (a common balance of bass to treble). Listeners did not always rate headphones with higher total harmonic distortion (THD, extra unwanted tones) worse. RTINGS adds that listeners still preferred some headphones with higher THD at low frequencies (bass).RTINGS.com (2025-09-30)“In the experiments of Temme et al. , after normalizing the frequency response of the headphones to a common target to remove linear distortion as a variable, headphones with higher THD weren't always rated worse by listeners. In fact, some headphones with elevated THD at low frequencies were still preferred, possibly because the ear is less sensitive to distortion in that range.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The RTINGS article or the Temme experiments show headphones were not matched to a common target, or listeners always rated higher-THD or bass-THD headphones worse.Research area Reviews and specsCited in Which headphone reviews, graphs, and specs can you trust?
Allion Labs found that small shifts in fit cause big changes in high-frequency sound. Allion reseats each headphone five times and drops tones above 7 kHz from its balance check.Allion Labs (undated)“Minor differences in headphone fit will cause larger differences in the curve in high-frequency response.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Repeated fit tests on one headphone show tones above 7 kHz shifting no more than below 2 kHz.Research area Reviews and specsCited in Which headphone reviews, graphs, and specs can you trust?
Thorvaldur Einarsson's 2003 University of Maryland thesis states that the perceived tone balance of music changes with listening volume. It adds that this is especially noticeable at low volume, where sounds below 500 Hz seem quieter.Digital Repository at the University of Maryland (2003-12-10)“The perceived frequency balance of music varies with the listening level. This is especially noticeable at low listening levels, where frequencies below 500Hz seem attenuated.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27A listening test shows people hearing the same tone balance below 500 Hz at low and higher volumes with no compensation applied.Research area Reviews and specsCited in Which headphone reviews, graphs, and specs can you trust?
Futuresource Consulting reported in October 2025 that half of consumers said they would repair their headphones instead of replacing them. In the same report, 62% preferred to replace a dead battery instead of replacing the whole headset.Futuresource Consulting (2025-10-13)“Half of consumers said they would repair their headphones rather than replacing them ... 62% would prefer to replace a battery rather than the entire device.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-29Futuresource Consulting's October 2025 report gives a different share of consumers who want headphone repairs or battery swaps.Research area Battery and lifespanCited in What a wrong pick costs
Sennheiser's February 2026 warranty page tells owners of Sennheiser consumer headphones to contact Sonova Holding AG.Sennheiser electronic SE & Co. KG (2026-02)“For any Sennheiser consumer audio products please contact Sonova Holding AG.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The warranty page at that URL no longer tells consumer headphone owners to contact Sonova Holding AG.Research area Brand record (Sennheiser)Cited in What a wrong pick costs
Sonova announced on March 1, 2022 that it had closed its buyout of the Sennheiser Consumer Division.Sonova (2022-03-01)“has successfully closed the previously announced acquisition of the Consumer Division from Sennheiser”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Sonova's March 1, 2022 release does not say the Sennheiser Consumer Division buyout closed.Research area Brand record (Sennheiser)Cited in What a wrong pick costs
Tomaszewska and co-authors wrote in 2019 that high fast-charging currents speed up capacity loss in lithium-ion batteries.eTransportation (Elsevier), open-access copy on Spiral, Imperial College London's repository (2019-08-16)“The high currents needed to accelerate the charging process have been known to reduce energy efficiency and cause accelerated capacity and power fade.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Cycle tests show cells charged at high current losing capacity no faster than at low current.Research area Battery and lifespanCited in How long do headphones last, and why does one earbud die first?
In February 2025, the University of Texas at Austin's Cockrell School reported a finding by Yijin Liu's team on earbud parts. The report says the team found parts such as the Bluetooth antenna, microphones, and circuits clashed with the battery. According to the report, this clash produced different temperatures at the battery's top and bottom portions, which damaged it.Cockrell School of Engineering, The University of Texas at Austin (2025-02-04)“like the Bluetooth antenna, microphones and circuits, clashed with the battery ... different temperatures at the top and bottom portions of the battery”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27This is wrong if the February 2025 Cockrell School report says the battery stayed at an even temperature from top to bottom. It is also wrong if the report says the parts did not clash, the clash did no damage, or another team found this.Research area Battery and lifespanCited in How long do headphones last, and why does one earbud die first?
Panasonic's Technics support page says one earbud often holds the phone link and relays sound to the other earbud. That main earbud uses more power and drains its battery faster.Panasonic USA (undated)“One earbud often acts as the primary connection to the phone and transmits data to the other earbud. This primary earbud uses more power, causing it to drain faster.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27Panasonic's support page states that both earbuds use the same power.Research area Battery and lifespanCited in How long do headphones last, and why does one earbud die first?
The Bluetooth SIG wrote in January 2020 that LE Audio will let a smartphone stream separately synchronized left and right channel streams to each earbud. The SIG added that most true wireless designs then streamed stereo to a single earbud. That earbud separated the channels and streamed one of them to the other earbud.Bluetooth SIG (2020-01-23)“In practice, that means a source device, like a smartphone, will be able to stream separately, synchronized left and right channel streams to each earbud — as opposed to streaming stereo to a single earbud, which then separates the channels and streams one of them to the other earbud, which the vast majority of true wireless designs do today.”Checked by Product.ai on 2026-10-16 · reviewed by jessica-ho on 2026-10-27The Bluetooth SIG January 2020 post states LE Audio smartphone streaming other than separate synchronized left and right earbud streams. Or it describes most prior designs other than streaming stereo to one earbud that splits and relays a channel.Research area Battery and lifespanCited in How long do headphones last, and why does one earbud die first?

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