I wanted to add a bluetooth speaker to my z-18 for those hot days of anchoring out and going for a swim. I did not want to have to cut any holes in the fiberglass anywhere so when I found a 6x9 bluetooth wakeboard tower speaker and amp all in one on Amazon I figured I would give it a try. I took off the pipe rack bracket and had a piece of aluminum bent to mount the speaker to the plate that covers the hot foot notch.
Here is a picture of how it turned out.
I am pleased with it, although it is actually a little larger speaker than what I pictured using it has a good sound and the fact that it is all in one unit and that it just requires a power wire is really nice. Even with the larger size speaker there is plenty of room for my feet on either side of it and underneath.