I'd like to suggest the 'in-boat' speakers from Wet Sounds.http://www.wetsounds.comNot cheap. But nothing is more waterproof or clearer, and they'll take the pounding. ps - I have nothing to do with the company...they're just made in Houston so I have seen/heard a few of their installations. pps - Maybe you could mount them 'externally' so as to avoid big holes?C