Kicker 47KEY500.1 Compact mono subwoofer amplifier with automatic tuning DSP — 500 watts RMS at 1 ohm at Crutchfield
TXD10001 EZ-AMP plug and play 1000 watts mono subwoofer amplifier - Taco Tunes - Toyota Audio Solutions
Amazon.com: Fosi Audio M04 Subwoofer Stereo Amplifier 100Watt 2-8ohm Mono Channel Class D Amp Home Theater Power Amp for Passive Speakers Subwoofer : Electronics
1.0 Subwoofer Board ,500w Amplifier For Subwoofer,12 Inches Subwoofer Amplifier Board Subwoofer Amplifier Module - Home Theater Amplifiers - AliExpress