Hey guys -- I've got a real puzzler of a stereo problem.
Here's a quick run-down on my system -- 3 amps (in-boat, tower, sub.) Up until yesterday they all worked without problem. Deck has 3-preouts. All RCA connections have been checked and seem good. I've also tried swapping RCA sources between the amps and it doesn't seem to have any effect.
If I turn the volume up more than 50% on the deck, the tower speakers start to almost oscillate/pan back and forth really quickly between right channel and left channel. The sub amp cuts out but seems to randomly "hit" or "pop" in a really weird way. The amps stay lit up correctly and I don't see any protection or clipping lights coming on. All fuses are also good.
If I disconnect the RCAs to the sub-amp, the exact same "hit/pop" continues... so it doesn't seem like it's related to the source.
If I unplug the tower speakers, everything works as it should (although the tower speakers obviously don't work.)
The tower speakers are being pushed by a PPI 4-channel amp that is being run in bridged stereo mode. Each "channel" is pushing one side of the tower. If I disconnect either channel, I still have the problem. This leads me to believe that the problem is not with the tower wiring or the speakers themselves.
All wiring is 00-gauge to a distribution block and then 2 channel to the amps. Plenty of 12v power. Have visually inspected all of the connections and wiring is flexible and seems to be in good shape. What next??