Alpine PDX-4.100 4-channel car amplifier 100 watts RMS x 4 at Crutchfield
Amazon.com: BOSS Audio Systems KIT10 4 Gauge Amplifier Installation Wiring Kit - A Car Amplifier Wiring Kit Helps You Make Connections and Brings Power to Your Radio, Subwoofers and Speakers : Electronics
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Pioneer GM-A6704 4-channel car amplifier — 60 watts RMS x 4 at Crutchfield
Amazon.com: Boss Katana-100 MkII 1x12 inch 100-watt Combo Amp : Musical Instruments
Kenwood KAC-M3004 Compact 4-channel car amplifier — 50 watts RMS x 4 at Crutchfield
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Kenwood KAC-M1814 Compact 4-channel amplifier — 45 watts RMS x 4 at Crutchfield
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Stage Right by Monoprice 20-Watt 8in Acoustic Guitar Amplifier and PA with 3-band EQ & Built-in Effects - Monoprice.com
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JL Audio MX500/4 Compact marine/powersports 4-channel amplifier — 70 watts RMS x 4 at Crutchfield