A MR404 Boss 4-Channel Amplifier will allow you to change between four different channels while on the water. Four channels allow you to hook up four speakers at one time. The Boss Sound Amplifier boosts your music and sound while you are on the water. A 4-Channel Marine Amplifier is safe to use on open water in a boat or party barge.
Jl Audio M400/4 Full Range, Class 2/3/4 Channel Marine Amplifier . 400W 2/3/4 Channel Marine Amplifier with patented Technology; Single Cycle Control. Two Stereo Pairs On-board Crossover: State-variable, 12dB/octave Butterworth with continuously variable cutoff frequency selection from 50-500 Hz. Configurable as Low-Pass or High-Pass. Defeatable. S..