Hey Ryan, I've got an 05 23' LSV with the stock sony Xplod set-up. Six coax speakers, a head unit without skip protection (weird) and the 6040 sony Xplod amp. That system was okay, a bit harsh on the ears, but pretty good for out of the factory. I recent bought four tower speakers (Kicker KS65s) and, (long story short) ended up disconnecting all the boat speakers to run the kickers off the four channel sony amp. It is loud enough to hear riding but it distorts at higher volume which bugs me and I suspect is from clipping from the amp. I've got two batteries and the volt meter stays above 13 at least when the boat is running. I've been told the alternator can be an issue, but I'm not running a sub and the boat stock alternator is 90amps so probably still okay.
If I want to add a second amp, use the first amp to run the boat speakers like before i did anything and power the tower with the new amp don't I have to get a Y adaptor on the RCA outs from the head unit to use both front and rear of each of the two amps? Since the stock head unit has 2 volt output it might be okay, but does splitting the signal like that degrade the sound? Any help would be greatly appreciated.