buy Aarons amps
Tower one 4 channel and one 2 channel, one pair per channel
Boat one 4 channel, bridge the 4 cockpit to the rear channels, put the bow on the front channels
On a tower, I don't like to do the series/parallel mix because you won't have balanced output from the speakers. In the boat it doesn't matter since as much since they are in different locations. If you want to run a sub use 3 four channel amps and bridge the last two channels for the sub. Need a sub? Hit me up, I have 2 options ready to go.