Been considering the same. Looking at putting one on each side under the gunnel up in the area toward the front pointing back. Looks like the fussion rectangle speakers will fit perfectly and a Janssen Bluetooth amp under the wheel or in the cabin. The new cape horns come with this setup and they sound pretty good. Just a push button to connect my phone is the only thing that is exposed.
yup that seems to be the new style for sure. No deck just a bluetooth connection then the amp provides the power. Decks never had as much power as they claim anyway.
Have you see the latest waterproof bluetooth controllers? They are the size of a Grady Rocker switch and will fit in there. When my Fusion deck dies and it will eventually. I'll get this MTX button and connect to my amp. Will save some space in the electronics box. I suppose a bluetooth amp would save even more space. But on a boat seems like components die so I never want to put too much money in one spot.
Bluetooth rocker switches:
Helm 6.5" speakers are Polk. Small ones run of deck bigger off amp
Cockpit speaker boxes. Before (came with boat) Larger set SKAR AUDIO works better with my amp. Bigger speakers sound so much fuller even at low volume.