JBL MA704 4-channel marine amplifier — 70 watts RMS x 4 at Crutchfield
Marine Amplifiers
JBL MA6004 580 Watt Amplifier With 2 MS9520 6X9" Waterproof Marine Speakers - Rock The Boat Audio
JBL R3500 Marine Bluetooth Stereo LCD Digital Media Receiver Bundle With 4x JBL 6.5" Black Marine RGB Speakers, 4-Channel 1000W Max Marine Amplifier, Amp Wiring Kit, Black Antenna - Road Entertainment