One last idea ...
I went back on forth on this for a long time and finally decided on (and fashioned) the following:I cut two black plastic squares to match the cheap plastic access panels in the cabin (the ones for the winches). Cut a mounting circle in each and mounted the speakers (facing somewhat down in the cabin) and reinstalled. Looks awesome and sounds even better.To add to this, I built and "electronics panel" out of birch plywood and cherry to fit behind the galley sink. It's a great looking box (painted to match the interior, except the face which is woodtone) and houses:1) AM/FM cassette2) VHF radio3) Cigarette adapter with cover4) Map light5) Binocular holder6) Fire extinguisher7) Chart holder on backI've received more compliments on this unit and would be willing to share the design with anyone. I hard wired this entire box to it's own battery and it's been my savior (since installing anything on a 240 is a trick). All the wiring is hidden and runs aft and then through the bildge up into the box. Very neat.Hope this helps