Amazon.com: Stetsom HL 1200.4 2 Ohm Multichannel Stereo Car Audio Amplifier, HL1200.4 1.2K Watts RMS, 4 Channel, 2Ω Stable Full Range HD Sound Quality MD Crossover HPF LPF Bass Boost Front Rear
Amazon.com: Stetsom EX 3000 Black Edition 4 Ohms Mono Car Amplifier, 3000.1 3K Watts RMS, 4Ω Stable Car Audio, Full Range HD Sound Quality, Crossover & Bass Boost, Car Stereo Speaker MD,