Question about Apple Bose QuietComfort 2 Acoustic Noise Cancelling - Headphones ( ear-cup ) - noise canceling
When press against my right ear, my bose QC3 delivers a high pitch sound .
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.
Posted on Oct 22, 2013
I have had problems with my headphones as well from Bose QC3's. They will give you a new pair for $100, even if it has been longer than a year...
Posted on Apr 26, 2009
As DIY - Dan has tightly mentioned, when the ear cups foam deteroits, the inside micor phone gets kind of too active and hence we get this high untollerable pitch. I have checkedon other websites as well and found that by replacing the ear cups, we can easily get ridif this noice. I have a pair of Bose QC3 which is experiencing same problem and I am going to order a pair of new ear cushions. Good luck to you as wel.
Posted on Aug 23, 2015
Try wearing the headset the "wrong way". The left side of the headset on your right ear & the right side of the headset on your left ear. I have the QC15 with the same problem and it worked for me. Good luck!
Posted on Aug 02, 2012
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