I'm no expert in this subject but I can tell you that now I have the right amp to run 3 sets of my MB Quarts that are water proof. I am very impressed with these speakers. I'm curious to the response of others. I'm thinking of mounting 2 sets of 6x9's under my engine hatch so there loud when your outside the boat. I am running the JL 454 amp for the 3 sets of 6.5's and they're loud enough to piss off the wife when I crank it up.