Hi, as per title I have replaced my Symphony with a Symphony 2+. I had to strip it down and fit a new changer mechanism but all good. One small issue though, when u turn the key to start the engine I get a pop from the speakers. I have Bose and I get sound from all the speakers so I think I wired the harness up correctly, I used a RNS-E harness and moved a couple of pins. Any ideas why it pops ? Cheers.