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Bose's consumer range of active noise-cancelling headphones are called "QuietComfort".

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Left side not working at all for Bose QC25

Hi the left ear peice has stopped working suddenly. No sound and the noise cancelling not working either. The right side is fine so not sure what is going on..

These are just over a year old and working perfectly yesterday..

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Same here, had them maybe 3 years, left side stared making funny noises with sound and noise cancelling, regardless if the cable was in or not, now they barely work or at least you cant wear them as they are annoying. Contacted Bose, they qouted $189.00(AUD) for repair with 1 year warranty. I asked if I could upgrade as it seems expensive but they said that was not possible. Considering I have always looked after them well and its not a cable fault I am not happy with the response ! Based on this it is the last pair of Bose I will buy.


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The left speaker (earphone) is connected to the "tip" of the connecting cable. Ensure that you have fully inserted the cable at both ends. Also try plugging into another source of music etc to see if the problem still exists,

If inserted OK and another source makes no difference try the following:

With the headphones playing, very gently flex the cable where it leaves the plug and listen if the sound comes and goes in the left speaker. Do this at both ends of the cable if necessary. If it does you probably have a faulty termination in the cable connector plug. If the left speaker still makes no sound it could still be a faulty cable or faulty headphones

If you have an Ohmmeter you can check for continuity from one end of the cable to the other. You may have a faulty termination in the cable You should only have to check for continuity from the "tip"of one end of the cable connector to the "tip" of the other end, as only the left earphone is faulty.

If you haven't got access to an Ohmmeter or your tests don't prove anything you could try going to a Bose outlet and ask if you could try a cable. That way you will be able to prove whether the fault is in the cable or in the headphones.

If you prove that the headphones are faulty and not the cable, given that it is just over a year old I would still contact Bose and ask if there is anything that they will do for you. I think that they may be less receptive to a cable problem as opposed to a headphones one.

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I have a QC25 purchased in BIC Japan in April 2015, the right speaker failed in August 2015 and I had it replaced under warranty by Atlas Singapore (local Bose distributor).

The left speaker started having intermittent problems in September 2016, warranty was already over by this time. Nevertheless after reading on other forum about this being a manufacturing defect, I went back to Atlas Singapore, in October 2016, and they replaced this as a courtesy with a 2016 manufactured unit. The support personnel I spoke to was very helpful, and she confirmed that BOSE has acknowledged there were manufacturing issues with 2014 and 2015 units.

So if you have a problem, get it replaced and I would not recommend trying a DIY fix.

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Thanks for the advice,

just changed the cable and the pb was still here,

i called bose and gave them serial number and they just were amazing,

they send me a return UPS ticket and i'll have new headphones in 10 days,

never saw such an easy replacement whereas out of warranty ! (apple should learn form them ! )

thanks a lot guys you made my day !

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Same problem here. If you turn on the noise canceling without having the cable plugged in, I can only hear it kick in on my right ear, so no cable issue. Mine are over 5 years old, so I'll see if I can get a new speaker and replace it like this guide suggests.

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For posterity: I had this same problem recently with a QC25 from 2015. They are out of Warranty. Poking around various Bose forums it is clear that this is a manufacturing defect that has impacted many of these units.

The Bose repair website offered a new replacement for $135. I was concerned that this unit would have the same problem as the old so I called them up. I was initially offered the same deal, but after explaining that I had seen this was a known defective unit, expressing my concerns about such a short lifespan for a $300 pair of headphones, and my concerns that another QC25 would have the same problem, they:

  1. Assured me that this is a newly manufactured QC25 with the defect addressed. This is plausible because based on forum posts it seems they were replacing them with QC35’s for a while; if they are dealing with mass replacement it would make sense for them to do another run of repaired QC25s.
  2. Dropped the replacement cost to $71 (including tax) with free shipping
  3. Started a new warranty for the new unit (1 year, same as the original warranty)

Long story short, it is worthwhile to contact them even if you are well out of warranty. I’m happy with the resolution considering how old the unit is at this point.

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I have QC25 bought in May 2015 and just got that problem with left cup yesterday. I’m in UK. Not quite satisfied with the response as I was offered a new pair of same headphones for £135, with one year warranty and having to send the old ones back. But, in my local shops you can easily buy these for £139 (or less if you look around) with 2 year warranty, and I’d still get to keep the old ones. I asked if I could upgrade to the newer model, but the only option they gave me was 20% discount on QC25 - so all in all £25 quid discount on same headphones, providing I’m returning the old ones. No help at all. I’d be perfectly fine with that if it was not known manufacturing defect - my pair is otherwise in pristine condition and not really used that much. I like them a lot, shame, as I will probably buy Sony now. I’d be happy to pay under £200 for QC35 replacement, or if I got the price as above I’d go for it too…

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