Re: Cooler spot for sub?
I recently designed a boat that competed in a car audio competition, and finished quite well! My personal boat has 2-12 subs and 8 6.5 polk main speakers, with a couple healthy amps feeding it all. Not everybody likes dead silence. Some guys like running straight headers and thru-hull exhaust. Some like a quiet engine but a nice sounding stereo. As long as it isn't cranked up in non-daytime hours in an area close to housing, I don't see an issue.
(the only time mine gets turned up is when I'm parked on the party sandbar, with dozens of other boats, many of which are louder. People who expect silence on that sandbar probably are best served by finding a different one away from the crowds)