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What amp ?

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.
 
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.

Says the guy who's head unit won't power on. . . . . = ) (Sorry, I had to)
 
Adding more channels allows the ability to control that volume seperate from everything else. Something like JL HD-RLC would more then likely be required to have seperate control of the amp.

Before adding additional amps you also must consider how much battery power you have. If presently the batteries can barely keep up or you do not get enough playtime when the engines are off adding more power will only make things worse :)

If it was me I would swap the 200/2 for another 600/6
 
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