It's down there a ways on my list (honey thinks her list gets ignored, I should show her the boat list), but someday we'll have a system.
I'm really not too sure about tower speakers for the rider, but the idea of tower speakers for the occupants is a whole other deal. Seems like putting your mids and highs up there pointing into the cockpit could give much better sound to the people in the boat that speakers in the gunels like they are. Had originally wanted to build two boxes, each with a 6x9" facing the rider and then two 4"s, one pointing into the bow area and the other pointing into the aft cockpit. Just don't really know what to do there. Would LOVE to cut the Yota logo out of 1/4" aluminum, polish it and then use it as a speaker cover for a 6x9". Like that idea?
For the subs, I'm pretty determined to just use the space in front of the helm. With a simple sealed box, one twelve or even a pair of tens would be possible. However, what I'd really like to hear is how four 8's would hit. Haven't studied this stuff for a while but realized that although tight, simple, small and flat, sealed boxes might not be the way to go.
Kept looking at these KAC-7201 amps as just a killer value. They're like $150 delivered, and put out either 230W RMS times two at 2 ohms or 150W RMS times two at 4 ohms, or you bridge the two sides and push 460W into a 4 ohm load. Originally wanted three of these: one for the tower (pair of 6x9's), one for the boat speaks (four 4" in the tower pods and four 6.5's in the gunnels), and one for a single 12 ro dual 10's in a sealed box at the driver's feet). I'd run the boat speaks of the front fade, tower speaks of the rear fade, sub off both fades, and use an accessory switch to control power to the tower amp. Would probably put the amps and at least one spare battery in the cubby.
Still like the Infinity Kappa Perfects and their higher end multi-element speaks just cuz they look pretty weather proof, look cool in white and are a good value.