Alpine S2-A60M S-Series Next-Gen 600W High-Performance Car Mono Amplifier

Power Output: 330W RMS x 1 @ 4Ω, 600W RMS x 1 @ 2Ω, 600W RMS x 1 @ 1Ω. It's compact design and selectable remote turn-on circuit make it easy to install in any vehicle. It can power a single 10" or 12" subwoofer or two 8" subwoofers for optimal performance.

eBay