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Kenwood XR1001-1 Reference Fit Mono Power Amplifier with 1000W x 1 output at 2 ohms, 2000W maximum power, Bass Knob Included, Speaker level Inputs and Signal Sensing Turn On - Creative Audio
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Amazon.com: Nobsound 100W Full Frequency Mono Channel Digital Power Amplifier Audio Mini Amp (Black) : Electronics
Fosi Audio M03 200 Watt TPA3255 Subwoofer Amplifier Mini Mono Channel Audio Power Amp for Home Theater Full-Frequency and SUB Bass Switchable with 32V/5A Power Supply - Newegg.com
Alpine S-Series Class D Mono Amplifier with Variable Crossovers Black S2-A60M - Best Buy