Question about Bose QuietComfort 2 Consumer Headphones

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Feedback in qc-2 headphones

It used to be that when you pushed on the earpiece of the qc-2's, they got a whistlimg sound like mic feedback. Now they are doing it almost constant. Otherwise the headphones are great.

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  • dustybootstr Feb 07, 2009

    I get a sound like mic. feedback on Bose QC-3 headphones. I get the feedback sound on all sources..It is mainly on one ear, but has gotten progressively worse..

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I think its a loose connection inside the headphones ear piece which is causing some kind of short and causing this feed back kind of sound. Give a call to bose if its still in warranty, else you got to live with it.

Thanks for using Fixya

Posted on Feb 07, 2009

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You have a loose connection or soldier joint on the Acoustic Noise Cancelling board on the side that is giving the feedback.

Posted on Feb 07, 2009

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Check the headphones on different units - not the same unit - different source altogether.
sounds as if the headphone jack has become damaged and needs to be replaced.

Posted on Feb 07, 2009

  • blueextc3221
    blueextc3221 Feb 07, 2009

    most likely the one on the earpiece itself. not on the source unit.

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Ensure the ports are clear and headphones are adjusted for a proper fit.

This -->link<-- is the owners manual for your unit

Thanks for using Fix Ya.

clarkco

Posted on Feb 07, 2009

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Hi and welcome to FixYa,

Initially, it would have to be determined if indeed the Bose QuietComfort 2 headphones is the one faulty or the device to where it is plugged into. Steps to do this would be:

  • try the QC-2 to several devices, MP3s, cellphones, laptop;
  • if whistling is consistent, then the QC-2 has been verified to be faulty;
  • if not the issue is with the signal source.
If the QuietComfort 2 headphones are determined faulty, checks could be done by using a DVM/VOM as continuity tester:
  • check the resistance of the left & right headphones/mini speaker by removing the padding, cover and exposing the connection behind;
  • check the continuity of the wires/cables from the 2.5mm stereo phone connector to the soldered joints at the back of the headphones/mini speaker;
  • the readings of the headphones/mini speaker must be identical on left & right;
  • the wires must read 0 ohms or nearly 0 ohms;
  • the resistance reading on the 2.5mm stereo baby phone plug must be identical; i.e. rear to tip is equal to rear to middle.
In some remote instances, it could be the headphones/mini speaker themselves that are at fault.

Good luck and thank you for using FixYA.

Posted on Feb 07, 2009

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Need to check the sire.

Also, does it make the sounf when you connect to all devices. If it happens only when you connect to Laptop, you need to get the sound card checked.

Thanks

Posted on Feb 07, 2009

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Posted on Jan 02, 2017

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1 Answer

Phones get a peersing screach; itgets louder when you press the side where the on/off switch is


The design of these headphones includes a microphone on the outside and on the inside of each earcup. The outside microphone detects outside noise. The inside microphone monitors what you are hearing and when it detects that the outside noise is present inside, the active noise-canceling circuits remove that noise. This happens fast enough that you perceive a significant reduction in the outside noise getting to your ears.

The airspace inside the earcup is a tuned chamber defined by the foam in the ear cushion. This is important because with the inside microphone in close proximity, but at a 90-degree angle to the speaker, the circuit must be designed to eliminate the normal feedback that occurs. When you press the earcup close to your ear, you are changing the size and shape of the air chamber inside of the earcup thus directing more of the speaker sound toward the microphone than the design can compensate for causing audio feedback to occur. You are hearing that feedback. Removing your hand from the earcup should restore the shape of the air chamber allowing the circuits to return to normal operation.

If the feedback occurs too easily when you are NOT pressing on the earcup, then the foam may have weakened/deteriorated and it may be time to replace the ear cushion.

On my QC-3 headphones, I can cause the feedback squeal in both earcups, with the left earcup being more sensitive to the shape change than the right.

Dec 01, 2013 | Bose QuietComfort 3 Acoustic Noise...

1 Answer

Severe squelch in left ear phone


The design of these headphones includes a microphone on the outside and on the inside of each earcup. The outside microphone detects outside noise. The inside microphone monitors what you are hearing and when it detects that the outside noise is present inside, the active noise-canceling circuits remove that noise. This happens fast enough that you perceive a significant reduction in the outside noise getting to your ears.

The airspace inside the earcup is a tuned chamber defined by the shape of the foam in the ear cushion. This is important because with the inside microphone in close proximity, but at a 90-degree angle to the speaker, the circuit must be designed to eliminate the normal feedback that occurs.

If the foam in the ear cushion has weakened/deteriorated to the point that it no longer has it's original shape, (in particular the lower half of the ear cushion), the size and shape of the air chamber inside of the earcup is directing more of the speaker sound toward the microphone than the design can compensate for causing audio feedback to occur. You are hearing that feedback.

On my QC-3 headphones, I can cause the feedback squeal in both earcups, with the left earcup being more sensitive to the shape change than the right.

It is probably time to replace the ear cushions. If so, they are available from Bose for $35/pair.

QuietComfort 3 Acoustic Noise Cancelling Headphones Bose Product Support

They are also available aftermarket at Amazon.com for $16.99/pair
Replacement Earpad ear pad Cushions For Bose QuietComfort 3 QC3 Headphones...

or $5.69/pair.
Bluecell Pair of Replacement Earpad Ear Pad Cushion for Bose Quietcomfort...

Aug 29, 2013 | Bose QuietComfort 3 Acoustic Noise...

1 Answer

No sound/ANR in one earpiece?


May be wire would have worn out. Change a new one.

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1 Answer

I want to use this for skype on my computer and it wont pick up the mic


Hi hilldest,

These headphones cannot be used for your computer ,because you computer requires seperate input for mic, unlike the mobile phone where you have only one pin and then it includes the mic function with it.

So if you want to use the mic you can use it by connecting a seperate mic in the pink slot of your computer and you can still use these headphone to listen to the incoming voice by pluggin it in the green slot of audio output.

Hope this helps ..:) Your feedback would be appreciated.

Aug 28, 2011 | Sony DREX12iP Headphones

1 Answer

Hi, when I press the left eatcup close to my ear, there is this very loud high pitch noise that comes from it and is unbareable. I have to removed them inmediately. What can I do, and what those this...


The design of these headphones includes a microphone on the outside and on the inside of each earcup. The outside microphone detects outside noise. The inside microphone monitors what you are hearing and when it detects that the outside noise is present inside, the active noise-canceling circuits remove that noise. This happens fast enough that you perceive a siginficant reduction in the outside noise getting to your ears.

The airspace inside the earcup is a tuned chamber defined by the foam in the ear cushion. This is important because with the inside microphone in close proximity, but at a 90-degree angle to the speaker, the circuit must be designed to eliminate the normal feedback that occurs. When you press the earcup close to your ear, you are changing the size and shape of the air chamber inside of the earcup thus directing more of the speaker sound toward the microphone than the design can compensate for causing audio feedback to occur. You are hearing that feedback. Removing your hand from the earcup should restore the shape of the air chamber allowing the circuits to return to normal operation.

If the feedback occurs too easily when you are NOT pressing on the earcup, then the foam may have weakened/deteriorated and it may be time to replace the ear cushion.

On my QC-3 headphones, I can cause the feedback squeal in both earcups, with the left earcup being more sensitive to the shape change than the right.

Aug 13, 2011 | Bose QuietComfort 3 Acoustic Noise...

2 Answers

My technics headphones have just stopped working, is it probably a faulty chord?


Unusual to fail on both channels at the same time, however the most common cause is a break in the wire just above the 3.5mm plug.
I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply.

Mar 01, 2011 | Technics DJ Headphones

4 Answers

Snapped Earpiece Off Skullcandy Hesh


Skullcandy does not sell replacement parts. but you can warranty those. they will either replace them or send you a 50% off code to use on there website.

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3 Answers

Speakers work fine. But left earpiece has low vibration.


I had exactly the same problem. They will give you a new pair for $100, even if it has been longer than a year... Here is a link to my blog post...

http://riajournal.com/ria/index.php/2009/04/25/bose-gets-5-stars-in-my-book-for-their-qc3-headphones/

Mar 29, 2009 | Bose QuietComfort 3 Acoustic Noise...

5 Answers

My headphones are feedbacking all of a sudden


The design of these headphones includes a microphone on the outside and on the inside of each earcup. The outside microphone detects outside noise. The inside microphone monitors what you are hearing and when it detects that the outside noise is present inside, the active noise-canceling circuits remove that noise. This happens fast enough that you perceive a siginficant reduction in the outside noise getting to your ears.

The airspace inside the earcup is a tuned chamber defined by the foam in the ear cushion. This is important because with the inside microphone in close proximity, but at a 90-degree angle to the speaker, the circuit must be designed to eliminate the normal feedback that occurs.

If the foam in the ear cushion has weakened/deteriorated to the point that it no longer has it's original shape, (in particular the lower half of the ear cushion), the size and shape of the air chamber inside of the earcup is directing more of the speaker sound toward the microphone than the design can compensate for causing audio feedback to occur. You are hearing that feedback.

On my QC-3 headphones, I can cause the feedback squeal in both earcups, with the left earcup being more sensitive to the shape change than the right.

It may be time to replace the ear cushions. If so, they are available from Bose for around $35/pair.

http://www.bose.com/controller?url=/shop_online/headphones/noise_cancelling_headphones/accessories/qc3_earcushionkit_acc.jsp

Mar 24, 2008 | Bose QuietComfort 3 Acoustic Noise...

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