Black Replacement Extension Cable Cord 1.2m/4ft for Bose OE2 AE2 QC2 QC3 QC15 QC25 QC35 headphones. Work with Phones, iPad, Computers, Headphones, Speakers, Tablets, PCs, Sound Box, MP3 Players ...

First, he determined that the right speaker had died, so he found a replacement on eBay. These were designed for a different set of headphones, but matched the impedance of the original Bose part.