Question about Bose QuietComfort 3 Acoustic Noise Cancelling Consumer Headphones

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Slft earcup on QC3 broke off

I removed my headset from their carrying holder today and found that the right side soft earcup on my QC3 was off. Upon closer observation I found the flat plastic sheet that holds the outer ear **** in place was broken in half. I think I could reassemble the unit, if I had a new plastic attachment, but for now I have placed two rubber bands around the ear piece to hold the sponge and leather fitting in place. I do recall seeing the credit card bill for these in my 2008 income tax review, so I believe that I have had the unit less than a year.

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  • Anonymous Apr 22, 2009

    Ear cups are junk. My friends broke in less than 6 months. Mine broke after about 2 years.

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They will give you a new pair for $100, even if it has been longer than a year...

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


Posted on Apr 26, 2009

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Called Bose they have a replacement ear cushions now for the QC3, I bought 2 for $38 US.

Posted on Jan 02, 2012

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2 Answers

Why no more sound in left side? the right side is fine. i moved the left side like a seesaw, then i found where the sound occur. is it the wire connection problem inside the left side? what to do?


Opened up one of the earcups and dont ask me how it was just by force. The cable that connects the 2.5 to the speaker is frail and there is quite a bit of shielded cable that can rub against each other over time. I fixed it by removing the cable and soldering in two separate cables of similar size.

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Apr 21, 2016 | SOL Republic Master Tracks MFI...

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

How to replace ear cushion on bose QC 3 headphone


The ear cushions are held on the earcup with six snap fasteners, three on each side. To remove the ear cushion, simply pull it away from the earcup carefully so that you do not break the plastic snap tabs.

It should not be necessary to pry the ear cushion off with a sharp object, but if you do, be careful. There is also a thin gasket seal between the earcup and the ear cushion, take care not to damage it.

If you need to replace the ear cushions with new ones, 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...

Apr 02, 2013 | Bose QuietComfort 3 Acoustic Noise...

1 Answer

Can bose QC3 work without noisecancelling/battery?


No, the audio input must go through the active noise-canceling circuits that drive the speakers in each earcup. The noise-canceling circuits require a charged battery to operate. Unfortunately, there is no way to bypass these circuits and drive the audio input directly to the speakers.

Aug 15, 2011 | Bose QuietComfort 3 Acoustic Noise...

1 Answer

I have had my headsets for 3 years, they work well, I have just noticed that the left ear pad is detaching from the base. How do I get fixed?


The ear cushions are attached to the earcup with plastic tabs that snap into the plastic in the earcup. The lower snaps may be unfastened. Try pressing the ear cushion firmly to the earcup around the lower edge to refasten the snaps. Do not press in the middle of the ear cushion - you may damage the internal microphone.

If this fails, you will need to remove the ear cushion by pulling it off the earcup and inspect for broken plastic where the tabs are on the ear cushion or where the tabs attach to the earcup. If a tab is broken on the earcup, replacement earcups are available from Bose for $35 per pair.

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

If the plastic in the earcup is broken, you can try to repair it or you can contact Bose about getting it repaired or replaced.

Jun 11, 2011 | Bose QuietComfort 3 Acoustic Noise...

2 Answers

Hello, I just got a Bose QC3 on eBay. It works fine except the cable which is not the original one but a one from T'nB and the left earpiece has a very annoying whistling noise when I press it or even...


i would buy a new ear cup.and a new battery. and perhaps a new cord.
i had a problem w/ my ear cups and i noticed that when i bought the new ear cups the sound was better.
i also read that if the battery got alot of usage (4 plus year) then the whistling noise comes from that. i'm starting to have the same problem. i have had my headphones for a long time. i think like anything else that operates on batteries its time to change it.

Mar 06, 2011 | Bose QuietComfort 3 Acoustic Noise...

1 Answer

I have lost sound in the left earcup of my Bose QC3 headphones, although sound comes from the right earcup. How should I proceed to fix it?


The solution to this problem is not for the faint hearted. You will break your headset, you will void your warranty, and you quite likely will end up with a non-working headset. You will also have to solder very small electrical components.

I also had the left channel audio not working, so the first thing to do was to take apart the headset.

Step 1. Remove the battery. Remove the two tiny screws from under the u-shaped plastic piece that holds the earpiece to the headset. You will have to pop out the end furthest from the audio jack. A #0 phillips is needed. Put the tiny screws in a safe place.

Step 2, Break the silver cover free from the black plastic earpiece by sliding a flat blade screw driver down between the joint towards the bottom of the earpiece. Be very careful not to insert the screwdriver blade too far into the earpiece because the circuit board is just inside. For some reason Bose decided to glue the two attachments for the bottom of the silver cover to the earpiece.

Step 3. Unscrew the 3 screws holding down the circuit board and put them in a safe place. Gently pull up the circuit board about .5cm. Look at the audio jack, the tab on the circuit board on the bottom right is the left channel audio. You can try to reflow the solder at this point on that tab using a 25W iron. It didn't work for me, but if your connector is not as bad a mine, it might work.

Step 4. Remove the solder from the 4 tabs holding the audio jack to the circuit board. Remove the audio jack from the circuit board (this is hard and accompanied by much cursing). Try not to overheat the board and lift the lands. Use a pliers to pull out the contact for the left audio channel and bend the jack contact out 1mm or so. Insert it back into the audio jack. Get your audio cord, plug it into the jack and check and see if you have continuity with an ohmmeter. If it all checks out, continue on.

Step 5. Resolder the audio jack back into the circuit board (also accompanied by much cursing). Screw the circuit board down. Put the battery back in and see if everything still works. If it doesn't, check to see if you broke the fine wires just above the audio jack on the circuit board. They run to the other earpiece through the headset.

Step 6. Reassemble everything and see if it still works. If it does, then congratulations and enjoy your restored audio. If not, open it back up and look for broken wires.

Disclaimer: This solution will likely destroy your headset. Proceed only if you have experience working with modern surface mount parts. I am an electrical engineer with 30 years experience in troubleshooting and repairing electronics and it still was not an easy fix. Total time to repair was about 4 hours.

Dec 13, 2010 | Bose QuietComfort 3 Acoustic Noise...

5 Answers

Bose QC3 makes a high pitch noise when i press it against my ear


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.

Feb 16, 2009 | Apple Bose QuietComfort 2 Acoustic Noise...

2 Answers

Only the left earcup works, even if i change the wire, its the same. but noise cancelling works on both.


They will give you a new pair for $100, even if it has been longer than a year...

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

Dec 23, 2008 | Bose QuietComfort 3 Acoustic Noise...

1 Answer

My old KOSS TD/60 Stereophones have a broken cable right near the earphone entry point. How can I open the earphone to repair or replace the cable?


I figured that that the earphones were pretty old, so if my 'repair' didn't work I would just replace them with new ones. There is a groove filled with acoustic foam that runs right around each earcup that terminates at the cord's entry point. After removing the headband yoke by carefully popping it out of each earcup I simply gripped both sides of the earcup and applied outward pressure until the front and back halves separated. Fortunately they are held together by plastic clips that snap apart. Once I had located the fault in the cable and repaired it the earcup halves easily snapped back into place. I now have a functioning set of headphones again!

Apr 22, 2008 | Audio Players & Recorders

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