Sound Extreme 8 inch subwoofer with built in 500w amplifier - Karting Axle Tool – Padholder Racing
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JL Audio RD500/1 Monoblock Subwoofer Amplifier Class D 500W RMS x1 at 2 ohms
Dayton Audio SPA500DSP 500W Subwoofer Plate Amplifier with DSP
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Car Subwoofer Amplifier Board, 500W Subwoofer HiFi Bass Amplifier Board DC 12V - Walmart.com
What Amp Should I Use with My 500-Watt Car Audio Subwoofer?