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Marie, have you considered not putting the speakers in the cockpit, but say at the mast base facing rear instead?
I find cockpit speakers are always too close in one half, too blocked or far in the other. Strong magnets can affect your binnacle compass, and speaker grills seem to make good footholds when the boat is heeled. I'd only put the in the coamings, well recessed and protected, and I'd try then out first to make sure the compass wasn't affected.
If they will only be used in port or in good wx, a pair of miniboxes (i.e. the Polk or Bose) can be clipped on the lifelines or stanchions as best suit you, if you leave enough wire lead for them. Moved below or to the foredeck if the mood suits you.