Can anyone tell me absolutely definitively, without a shadow of a doubt, whether an a/d/s P4100 will accept line level output from a BMW head unit? I want to install one in my mid nineties BMW 325, while retaining the stock head unit and I have been told that if I retain the stock HU, I will need an amp that accepts line level output or else use a line level convertor. Thanks for any help.
Dan