I just unstalled a Parrot CK3000 Bluetooth phone kit in my truck. It has 4 barely amplified speaker connection for your 4 car speakers. You tie them in parallel with your Head Unit amplifier. What happens is when a call comes in the Head Unit Mutes and the Parrot sends the voice to the same speakers.
My question is this. If I put the Parrot speaker wires on the output of my AMP I realize that when a call comes in The amp will mute and the parrot will send the voice thru the speakers, What I dont know is when the call is over and my amp sends 100 watts to my speakers will it backfeed the Parrot and damage it?