I bought a Kenwood KDC-BT34U, assuming the swapping of ignition positive and permanent positive at Audi was all that done. This was not like that. One need additional this (or a similar) adapter to the rear speakers to drive or whose active system. However, this adapter makes only that, he is not an ignition positive from the CAN bus. The Kenwood Radio works for me only if I together close ignition positive and permanent positive (ie yellow & red). So you have to turn off the radio manually or purchase a Canbus adapters addition.
The control of the rear speakers worked right away. The sound quality is good, I have to date no noise or similar can hear. The plugs fit.
