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Sound Ordnance™ B8PT Knob Kit Replacement remote level control for a Sound Ordnance powered subwoofer at Crutchfield
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Amazon.com: Massive Audio UR1 Amplifier Gain Control Knob. Adjustable Gain Amplifier Remote Level Controller for All Current Massive Audio Amplifiers - 0 to 12 dB Sub Amp Gain Control : Electronics
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