QC25 repair] While it's actually not that hard to find good tutorials online on how to replace the speakers, I want to really insist about the heat on plastic. Don't do like
2 x SPEAKERS for Bose QC25 headphone high quality REPLACEMENT speaker PART QC15 | eBay
Replacement Speaker Unit for Bose OE2 AE2 SoundLink SoundTrue QuietComfort 3 15 25 QC3 QC15 QC25 QC35 Headphones
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Repair Bose Quiet Comfort QC25 with bad right speaker - YouTube