Bluetooth audio generally uses one of two "profiles"; there's A2DP, and generally sounds fine. I've not noticed the compression. A2DP is one-way, audio output o

Bluetooth audio generally uses one of two "profiles"; there's A2DP, and generally sounds fine. I've not noticed the compression. A2DP is one-way, audio output only. There's also HSP, which is two-way (mic+headphones, essentially), and it sounds like a potato.¹ (I have no idea why this is, either. My brother once "solved" the quality issues of HSP by getting a second headset, putting both headsets on his head, putting one in HSP and using the mic from that one, and putting the other in A2DP. It worked fine, aside from it wasn't comfortable and it looked ridiculous. He was on Windows, but I have the same issues in Linux and OS X.)