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SSL Force Amplifier Power Remote Subwoofer Control Bass Knob Car Stereo Amp 3.5 | eBay
Pioneer 8" x 5.25" 170-Watt Compact Active Subwoofer with Wired Bass Remote, Max Power, TS-WX140DA - Walmart.com
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Remote Bass Level Control Car subwoofer controller For Alpine PWE-S8 Car Speaker Subwoofer - Newegg.com
Sound Ordnance™ B8PT Knob Kit Replacement remote level control for a Sound Ordnance powered subwoofer at Crutchfield
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DS18 Universal Bass Knob with Voltage Display | Remote Out
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SX310 | Sound Storm Labs
RBC | Remote Bass Control. Dial in the perfect bass.
