Question about Bose QuietComfort 2 Consumer Headphones

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Humming sound in the left earpiece

The headphones hum when turned on. The humming is much stronger where near a laptop and almost gos away when standing in the middle of a bedroom. The humming is only in the left earpiece. I had not used them for a month and they worked perfectly then.

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  • markatlnk Oct 27, 2008

    I too have the same humming problem in the left ear. This is a shielding problem of some sort. If I ground myself to the laptop it stops the hum. I have tried adding additional metal mesh behind the cloth,but it only reduces it and does not quite stop it. My background is in Electrical Engineering so I do know a thing or two about electrical things. I will try a few other things, I do not want to send them in for repair ($100).

    Mark



  • jay9853 Nov 12, 2008

    I have a similar problem but it is the right earphone. I has come & gone but now seems to be permanent. Touching the wire plug ends affects the hum (agree it is some kind of grounding issue) but plugging into a laptop does not get rid of it.

  • prje Dec 22, 2008

    I have the same problem from the left side. It to came and went a while back but now seems permanent. Touching the connectors lowers the noise considerable. I called Bose and they told me they don't fix QC2s anymore but I could uprade to QC3s for $300 or so. Since this is they second time I've had trouble with them (different issue originally) I told them what I thought of the product quality and service.

  • RZHirschhorn Jan 06, 2009

    I have the same problem. They worked fine initially and after a while I was hearing a hum when I connected the headphones to my computer, my minidisc or my electric piano. The hum diminished slightly when I held on to the computer or the minidisc, but didn't disappear entirely. I'm really hoping Bose will fix it for free or replace it with another set without the problem. I mean, for $300, they should work flawlessly.

  • tim6130 Jan 06, 2009

    Hi - I can't solve this problem but I can add a detail. I was suffering from a hum on my bose headphones. It was present wen I plugged into my tower at work as well as the Mac laptop sitting next to my tower- I assumed that it had something to do with grounding- the hum sounded like a 120hz type deal. Anyway I plugged into my iPod and even that hummed. If I touched or picked up the wire the hum went away.

    Anyway, today I did not bring in my Mac laptop and TA-DA the hum is gone. SO- I GATHER THAT THE MAC LAPTOP, WHEN PLUGGED IN, IS CREATING SO INTERFERENCE. I've used the headphones on the laptop before and not noticed, maybe it was never plugged in? Or maybe some mac update has altered some circut activity which now cause a hum(that sounds like voodoo though)

  • Magnex Jan 18, 2009

    My QC-2 has the same problem begging today.

  • Anonymous Mar 09, 2009

    same buzzing as described in the left ear piece, extremely agitating.

  • pschluet Apr 20, 2009

    markatlnk,
    I tried your solution (turning the pot to a new position and then back to its original position), and it did not work.

  • Anonymous May 07, 2009

    same as others describe

  • Anonymous Mar 26, 2014

    I had these for about a month when they broke

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Hi all,

Mine has had the same problem as the rest, and I just fixed mine. I hope this solution will work for
the rest of you also. The problem is with R82 located on the pcboard in the left ear piece. This
is a variable resistor. Inside this resistor it develops a condition called a dry contact where the
wiper isn't making contact with the conductive surface. If the pot is moved a bit then returned
to its original position, it wipes the contact clean and restores normal function. To access this
pot, remove the ear pad and fold down the cloth from the top just enough to get to the screw
that is closest to the top. After removing this screw, you can remove the arch shaped cover
on the outside. R82 is labeled. The problem is they put a drop of glue to prevent the pot from
rotating. GENTLY! remove the drop of glue. I used a sharp knife and wedged it between the
pot and the glue, do not put too much pressure on the pot. Once the glue has been removed,
not the position of the pot and turn it slightly and the return it to its original position. That is all.

For those designing circuits, make sure that you have about 1mA of current through the wiper
during normal operation. This will prevent this problem.

This may not work for you and I am not responsible for making a mess from your headphones
so try it at your own risk.

Let me know if it works.



Mark Bauer
mark@zjunk.net

Posted on Mar 21, 2009

  • machty
    machty Sep 25, 2012

    It didn't work for me to just twist and return the variable resistor to its original position but to turn it counterclockwise as far as it would go. This reduced the hum by 90% (still barely audible) with no apparent decrease in sound quality.

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This solution worked for me (althought it isn't really a fix, rather a way to avoid the problem). My left earphone also buzzes, particularly when I'm near my laptop. However, this is only when the laptop is plugged into the wall. To kill the buzz unplug your laptop's power supply from the wall. Also if there are any other power supplies nearby (like for a cordless phone), unplug them as well. 
Not much a of a solution, but at least a temporary work around and definition of the problem.
Maybe the EE guy who posted can figure out a lowpass filter which the powersupply can be plugged into.

Posted on Feb 02, 2009

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