The iPhone 3G supports Bluetooth stereo (A2DP) but lacks any volume control. As a result, my JVC stereo with the KS-BTA200 Bluetooth adapter clipped stereo audio so horribly that I ended up removing the adapter and foregoing the Bluetooth hands free capabilities. Now, I just use my AUX jack for music and a separate Bluetooth speaker phone (as long as it doesn't do A2DP).
Has anyone been able to get acceptable (not clipped) Bluetooth Stereo Audio from their iPhone to any car stereo? What models work well?