Now we're dealing with the core issue which is why I mentioned my obsession with the wiring harnesses earlier. Every current option I know is a multi-step hybrid, leaving us with nothing but excess complications. "Wireless," per se, certainly ain't the answer. Plus, I'm hindered in my race to rely on the streaming servers, because of MP3, avec, 'YouTube'-quality images.
(Let's save the world's priciest stuff 'till last, even if your boat is the Queen Mary II.)
Lars brings our focus on Linn, because you can send a low-voltage 'balanced' line signal to the speakers, and place your low-noise amps there. That's fine, but I get the feeling this application is best for the secondary speaker array; Zones 2, 3, etc. I still want a *****in' power amp for the main galley and the open bridge. With the Linn suite you can do both.
Mainly, we need one source for overall background music. How about a "Parasound- 6/12CH" amp, whereas I know I can deliver a clean 40w/rms @ 8 ohms, over a total of 1,000 ft.+ of 14ga wire?
"Russound" says, "Wait, we can run the signal via Cat5 to the Amplified local volume controler, giving you all the sources on demand." (But for your Mains, it sounds exactly like a Craig car unit, so we're back to exploring 4-Ohms.) "Geffen" makes a whole series of analog to Cat5, or fibre converters, so you could place these about your remote areas, (select your sources via keypad,) and get that Russound sound on your laptop, or remote stereo. This makes sense because their dedicated keypad system is cheap, reliable, and simple to program with multiple scenes; day, nite, all on on arrival, all off...
Plus, with a local A/V receiver, everybody gets the best local control, such as H-DVD-RGB to their TV. (That's why the guy bought those 6 HD sat receivers.) Add a pair of "Jensen," consumer to 'balanced' adapters and you won't hear radio, or -spike interference.
ADA goes all this one step further, with their "Suite 8," as you will set/re-set all of your scenes, via a 232 control at your main computer. I mention it first, because we're going to end up with a hybrid, and we don't need Crestron, or AMX to achieve full automation. Their "iHome" open-platform unit most closely parallels your current media delivery issues. http://www.ada.net/products/av/ihome.php
As with the migration to 'HD', very few early adopters who sought and paid for 'quality' actually ended up with RGB at their TV's. (Except $$$ AutoPatch, + Crestron environments.)