I'm running a Sony Xplod Marine stereo with FB wired remote and also another wireless remote. It's not true surround sound, but with 5 Bose speakers down
(1 sub, 4 satellites) and 3 speakers up top (another Bose sub and 2 Alpine Marine FB speakers) it sounds great. It all runs on 12V and the two Bose subs are passive...not powered.
I can bluetooth from my Amazon Echo Tap or laptop or tablet or phone to my stereo or select TV audio via wired input.
Gotta have good tunes on a boat, right?