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,
Amazon.com: Stetsom IR 400.1 2 Ohms Compact Digital Mono Amplifier, Iron LINE, 400 Watts RMS 400x1, 2Ω Stable, Monoblock Digital Car Audio Amp TS, Full-Range Sound Quality, Crossover : Electronics