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Honestly, you have amps to power the inboat speakers and the sub. With the 770's, your underpowered on something. 75W each is fine for the 650's, but you need to hit the sweet spot for the 770's. So I think your at least 200 watts shy at this point. If you add two more speakers, you don't have enough power for all that. I suggest also, with all that distribution, that you consider the EQ so you do have some zone control for volume of individual zones. I'm not sure where another amp gives you any more capability of zone volume control, but you need another amp anyway, or exchange one for a larger amp. My JL system isn't overpowered, and I have a 600/6 and a 500/3, for 8 M650's and the JL M10W5 enclosure sub.