Subwoofer Pre Board, 2.1 Channel Subwoofer Boards 20-200 Hz 2.0 Full Tone DC 12-30V 0.1 Bass for Signals'$ : Amazon.in: Electronics
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Opus Active Self-Contained 120-180W RMS Subwoofer Amplifier Module 20Hz - 200Hz | eBay
Hertz CBA 250 active subwoofer box
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ATS10 Powerful High Efficiency 10 Inch Subwoofer Speaker 20Hz-200Hz 250W - China 10 Inch Speaker and Active Subwoofer price | Made-in-China.com
Low Pass Board, 1.6mm Thickness 20Hz-200Hz Subwoofer Boards 2 Channel 10W Maximum Power For Signals | Walmart Canada