Definatley another pair of good 6.5" or 7" in the rear is the first thing I would do. Then another pair in the bow. Then a Subwoofer and lastly some REV8's or REV10's on the tower! We have an 18'6" Larson outboard with 6 in boat speakers and a 10" free air subwoofer. The rear of the boat is running off of a 5 channel amplifier. The front two speakers are run off the deck.
Last edited by doc1; 07-07-2011 at 3:27 PM.