[whatevertrevor]

> It sounded like an old-timey telephone.

Again check the codec mac is using for this. I've had no issues with them, you either had a defective device or Mac is forcing the SBC codec. On windows there's a headset audio device for every bluetooth device that sounds garbage too (regardless of what the device actually is).

[dkonofalski]

There's no way to set the codec on the Mac unless the individual software has an option for it. Considering that no other devices have this issue and it was improved with a firmware update, I'm going to say it wasn't an issue with the Mac at all.