Tom, I'd be cautious about placing those Bose Acoustimass 3's outside. I don't think they'd last long. I have Alpine marine speakers outside on the FB. Mine are all in the salon except my FB subwoofer is inside the FB helm console.
The salon sound with 5 Bose speakers is so balanced it's impressive. When I stand at the acoustic center with a great song turned up like this
it blows me away! I think I can see ripples on the water! (jk)