Audiopipe APMN-4080 Class AB 78 Watts x 4-Channel Mini Amplifier
AudioControl ACM-4.300 ACM Series compact 4-channel car amplifier — 50 watts RMS x 4 at Crutchfield
Mini Amplifiers and Compact Car Amps - OnlineCarStereo.com
Vibe Powerbox 4 Channel 100w x 4 Mini Amplifier POWERBOX100.4M-V0 - 12v Electronics
Kenwood® Maxpower Series 400-watt-max 4-channel Compact Marine/powersports/automotive Class D Amp : Target
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MX 600W 4 Channel Full Range Class D Sub Compact Amplifier - Phoenix Gold