Last year I purchased a 2005 X5 4.4i with nav and DSP. The bluetooth works great EXCEPT that the sound quality in the car is very poor. People on the other end of the call say that I sound great, but I have a hard time understanding them.

For lack of a better description, the phone audio is ALL midrange without any high end. It sounds "honky" making the phone unintelligible. The radio, CD, and aux input (iPhone) all sound great. Is this characteristic of the Bluetooth module, or is there something wrong with my system?