Skar Audio RP-75.4AB 500 Watt Full-Range Class A/B 4 Channel Car Amplifier

Amazon.com Price: $159.99 (as of 04/11/2021 02:17 PST- Details)

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500-Watt MOSFET 4-Channel Class A/B Power Car Amplifier
RMS Power at 2 Ohms: 125 Watts x 4 Channels