I have 4 Pro-80's. I've also got a tower that sits over my rear seat so being super loud in the boat is not an issue like it is for Clayton's xti as he mentioned above. I can see how that could be a problem. I can't stand to have them up loud when I'm on the swim platform. They sound cool turned down and you're right in they're path, but loud they're a little bright.. They're definitely efficient and designed to project. Now when I'm in the boat, the tower speakers actually fill out a lot of midrange nicely. Between all speakers it sounds loud and clear. If listening critically and loud is the focus, I have the listener sit on the seat in front of the engines. (Pro-80's are right above their heads.)
And if listening while riding, the 4 pro-80's rock! Loud and clear! I may dabble with a low frequency boost, but only a small boost...