Join Date: Dec 2010
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Is the speaker still in use, or would you prefer to keep that option?
A quick and easy method would be to find an appropriately sized screw-in deck plate, like those from Beckson...
For an offshore boat, that's the ideal method for installing cockpit speakers, anyway - recessed behind a removable deck plate that can be installed for heavy weather, and to protect the speakers from the elements when not in use...
At any rate, I'd be inclined to cover that up, and make sure that cockpit locker lid is gasketed or reasonably well sealed, as well... If there is any inshore body of water where a 27-footer stands a decent chance of getting knocked down or pooped, it would be San Francisco Bay... (grin)