A2DP with the exact same headset and the exact same sound file played through my WM6 phone and my WinXP PC make slightly different, but noticeable changes in the music. But then again, with different post decoding processing, it should be a little different. When used with the D200 adapter and Windows Media Player the music is paused during a phone call, which is a nice touch. She states "Stereo music played through the Voyager 855 sounded middling to poor. I heard some bass, though it distorted easily and was more boom than actual punch.