BOSS Audio Systems PD5000 Phantom Series Car Audio Amplifier - 3000 High Output, Class D, Monoblock, 1 Ohm, High/Low Level Inputs, High/Low Pass Crossover, Full Range, Hook Up To Stereo and Subwoofer -
Amazon.com: Pyle 4 Channel Marine Amplifier - Compact Power 400 Watt RMS 4 OHM Full Range Stereo & Waterproof - Wireless Bluetooth Receiver Audio Speaker with LCD Digital Screen - PFMRA440BB : Electronics