Amazon.com: BOSS Audio Systems MC900B Amplifier for ATV UTV Car Marine - 500 High Output, 4 Channel, 2/4 Ohm, Bluetooth Multi-Function Remote, RCA Out, Weatherproof, Use Amp with Stereo and Subwoofer, Crossover : Electronics
Pyle 6-Channel Audio Marine Amplifier - Compact Power 600 Watt RMS 4 OHM Full Range Stereo with Volume Bass Treble Rotary Control - Wireless Bluetooth Receiver Speaker & LCD Digital Screen PFMRA640BB