I have an Alpine 9886 and when i came back out from dinner to drive home, there was no sound from any source(tuner, cd, ipod). Got home and looked at sub amp (pa1200.1) and it was in protect mode, so I unplugged the sub and it stayed in protect mode. Pulled head unit and disconnected rca going back, came out of protect mode. Tried another set of rcas from head unit to amp and as soon as i plugged into amp it went into protect mode.
I also tried to use my iphone with an adapter that goes to male rcas and hooked it up to amp, but now sound from sub. Does the iphone have enough siginal to be used as input to the amp?
Not sure where to go from here.