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Let's take a 6-channel amplifier for an example. You can stretch it to all three zones (in-boat coaxials, sub and tower speakers). Two channels will bridge mono to the sub. Two channels will run up...

If you have the six factory speakers driven only by the source unit then your first audio upgrade is clear. Add a 4-channel amplifier to run those six coaxials. If you plan on adding a subwoofer then...