Hey Guys!
haha as far as subwoofer goes, this system absolutely SLAPS and the factory 12IB sounds terrible lol. it's not even fair how much more bass there is.
having extra batteries is awesome. we love to pull up on an island leave the music on and picnic and swim for an hour or more and keep it on. since i can fully drain the two batteries and then use the third to start the boat we've never had issues. it's awesome. expensive to do but worth it for peace of mind. we also moved them to under the one seat near the storage that no one ever opens so you dont even notice them.