Kenwood Excelon XR601-1 Reference Series Mono Subwoofer Amplifier | electronicsexpo.com
Amazon.com: Pyle 6-Channel Audio Marine Amplifier - Compact Power 600 Watt RMS 4 OHM Full Range Stereo with Volume Bass Treble Rotary Control - Wireless Bluetooth Receiver Speaker & LCD Digital Screen PFMRA640BB : Electronics
600-Watt RMS Mono Block Powersports Amplifier
Alpine R-W10D4 Type R 10" Dual 4 OHM Subwoofer with GTR-601 Mono Subwoofer Amplifier 600 watts RMS x 1 at 2 ohms - Creative Audio