Amazon.com: DS18 ZR500.1D Car Amplifier Class D 1-Channel Digital Monoblock Amp with Remote Subwoofer Level Control 1500 Watts Peak Power - Adjustable Low Pass, Gain Knob, Subsonic Frequency and Bass Boost :
Wāvtech Link500.1 mini Compact mono subwoofer amplifier — 500 watts RMS at 2 ohms at Crutchfield