I have a 2004 honda civic and got a 4 channel amp installed by a shop a while back. They left all the stock wiring of the car speakers to the head unit. But theres also speaker wiring from the 4channel amp to the head unit that i have disconnected since I starting having issues with the amp i removed it but the speakers wont play without it. Is it maybe because of the rca's that are connected on the head unit? If anybody knows what i have to do to play them with just the head unit. Can you please let me know thxs. Pioneer head unit DEH-X btw