I use A2DP Audio Profile to link my cell phone(s) to my car stereo, but the quality is still terrible because of echo. The second scratch is that Andriod won't play FLAC, and regardless BT doesn't have enough bandwidth to stream loss-less audio anyways. Other than for data transfer the technology is overrated.
BT for sound transmission is a major FAIL!
Back to the drawing board please. This technology seems to have major potential, but currently I rate it slightly more useful than a Ham radio.