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Amazon.com: OSD Audio 300W Mono-Channel Class A/B Subwoofer Amplifier, Auto Sensing, 4 -8 Ohm Stable : Electronics
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Amazon.com: 2.1 Channel Subwoofer Amplifier Board, 300W Power Amplifier Board High Power Volume Potentiometer Power Amplifier Module : Electronics
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300W 3 Channel Subwoofer Power Amplifier Board 2.1 High Power Amplifier Board | eBay
XDM300/1 - Monoblock, Class D, Marine Subwoofer Amplifier, 300W | West Marine
XDM300/1 - Monoblock, Class D, Marine Subwoofer Amplifier, 300W | West Marine
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Amazon.com: OSD Audio SMP300 Class D Digital Subwoofer Amplifier Rated at 300W Max : Electronics
Amazon.com: Yung SD300 300W Class D Subwoofer Plate Amplifier Module No Boost : Electronics