I found a car unit that plays DVD's in 5.1 surround sound, and connect it through car amps to Bose Jewels - those little cubes. I can listen to music
with 12 volt only, and watch movies in surround sound with a 120 volt flatscreen. Then I hooked up my iPhone
through the television and the car stereo, so I can watch downloaded movies as well.
it's not a perfect set-up, and it's a work
in progress, but it's great to have a home theater experience on the boat