Sounds fun- I’m a sailor as well (Beneteau 411). I have been extremely happy with the original Kef LS50W in a small room (10 x 11) with Isoacoustics Aparta stands (stands take performance up an entire level). Not sure if in your smaller space how they would sound, but my experience in the room noted above is a sound quality matching or exceeding much larger and more expensive systems. You would just have to find a way to secure the speakers for your day sails and really secure them for any potential rough weather (or stow away). I’d recommend the stands which could be added perhaps for your serious(ly fun) listening. KEF has done the work of component matching for you and eliminates securing and storing components. This assumes you have a Wi-Fi connection at the dock.
Moving on a sailboat - bookshelf speakers?
I've decided to spend a year on a sailboat. I'm loath to give up my home system as it's about as good as you can get before spending silly money. (LX521s, ATI/Parasound, maxed-out Linn LP12 with Blackbird arm and VdH Frog) All of it is going in storage except for my Ayre QB-9 Twenty powered by my M1 Mac Mini.
I am interested in opinions on great bookshelf speakers that actually need to live in a bookshelf. (No room for stand-mounted speakers in a 40' monohull sailboat.) I also need a good integrated amp to power the speakers. (I'm leaning towards the Audio by Van Alstine Vision SET 120 Control Amplifier.)
I think I've got about 18" tall by 12" deep as limitations. Maybe less. (I'll update when I know for sure.)
What speakers should I be looking at? Various reviews like the KEF but declare that it needs stands. Others declare the sub-$1000 B&W anniversary speakers and don't mention stands. I wish I could fit a pair of LX Minis, but the associated mid/bass tube knocks it out of the running.