I've got a 2004 180 with 4 speakers. Two 5" round with separate tweeters on both sides of boat positioned even with the console front seat. Person sitting in the console forward seat gets perfect stereo sound but often asks to have it turned down. This is usually the admiral making this request as the kids can't have it loud enough. On the starboard side of the console I've got a 10" subwoofer which is matched with the separates. In the stern below the two seats I've got 6x9 speakers on both sides. Under the console I've got a Clariion CD player with Sirius satellite and AM/FM. This plugs into a 200 watt amp mounted on the floor under the console as far back as you can go. I put stuff on top of the amp but try to get it some air since it really heats up. This system was already installed when I bought the boat so I can't give many installation tips. I can say that I'm happy with the sound and I was quite surprised to see ripples in the water at hight volume.