Infinity Reference REF-551a Mono Subwoofer Amplifier 550W RMS x1 @ 2 Ohms

Infinity Reference REF-551a Mono Subwoofer Power Amplifier

Nakamichi PA-300ii Mobile Power Amplifier

AudioControl EPIC500 EPIC Series mono subwoofer amplifier — 500 watts RMS x 1

Infinity Kappa K2 Automotive Amplifier Used G2U

Nakamichi PA-150 Mobile Power Amplifier F.No. 99991 (SVR) 14W X4

Infinity Reference 10001A mono subwoofer amplifier 1,000 watts RMS at 2 ohms

AudioControl EPIC 1000 mono subwoofer amplifier — 1000 watts RMS x 1 at 1 ohm