Just finished installing, in 2006 Sebring convertible, Pioneer BT8500 head unit, 4 x JBL 6 X 9 300W max 4 way coax, all new monster speaker wire, and Power Akoustik 2700W 5 channel amp, not using the 5th channel(sub) for now. I ran 3 RCA's from head unit to the amp, hooked up correctly. Amp...