The last time we painted the bottom was August 2008. We haven't used her much or wiped her down so I think that contributed to the fouling seen as she was hauled. Paint is Trinidad SR.
After much thought and research I went with a PolyPlanar MRD 70. The head unit mounts out of the way as you rarely need to access it. I don't plan on using the CD feature much if at all. In this case I mounted it in the cockpit locker and the controls were mounted in the old hole for the engine vent. Just under the traveller and behind the tiller.
I ran a RCA to 3.5 mini input for the ipod, but will likely get the ipod integration system in the future.
I didn't want to cut the cockpit seats or mount them in the companionway bulkhead, andI wanted them out of the weather. I mounted a set of bose out door speakers under a plank of AZEK that mounts to a bracket on the pushpit. Picture the azek like a cutting board or shelf across the pushpit. I have a slotted bracket attached to the pushpit and the shelf has two bolts that slip through the bracket and a set of wingnuts to hold them tight. The top of the speaker shelf makes a great spot to grill or fish from.
Wires are run through a stern vent and I use a trailer plug to make it easily removable.
There is a second set that is mounted along vertical face under the berths port and starboard down below.