LCV Universal Bass Knob Level Controller with Built-in Digital Voltmeter, Blue LED Display, Remote Gain Control, On/Off Switch, Prevent Damage to Your Audio Equipment - Recoil Audio
Kicker RGB Lighting Controller - Marine Stereo
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BOSS Audio Systems SLIM10 Elite Series 10 Inch Powered Car Audio Subwoofer - Low Profile, Remote Subwoofer Control, Built In Amplifier, Under Seat, For Truck, Hook Up To Amplifier - Walmart.com
Harman RBC Wired remote subwoofer level control at Crutchfield
SPK-12S4 - AudioControl
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Car Remote Amplifier Bass Controller 2 RCA Gain Adjust Level Volume Control Knob Horn Audio Regulator Home Subwoofer Equalizer - AliExpress
CIRMECH Universal multifunctional remote controller for USB subwoofer decoding power amplifier board with digital Bluetooth card
RBC | Remote Bass Control. Dial in the perfect bass.
PSB-200 Subwoofer Amplifier with Crossover / Phase Control - 200W – Soundavo
Exclusive Dual 10" Sealed Subwoofer Loaded Enclosure with IXS10.4D for
AudioControl 2-Channel Active Line Output Converter with AccuBASS and Subwoofer Control Black LC2i PRO - Best Buy
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Boston Acoustics GTA-RSL Remote subwoofer level control for GTA amplifiers at Crutchfield
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Pyle Active Down Firing Subwoofer - 10 Inches, Ported Design with High-to-Low Input Level Controller, Invisible Down-Firing Speaker, Color Black, Built-in Convenience - PSUB10A - Walmart.com
Amplifier/Subwoofer Bass Volume Level Controller
Remote Subwoofer Controller Adjust | eBay
JBL RBC Bass Knob Wired Bass Remote Controller for BassPro SL and BassLink SM Compact Subwoofer - Walmart.com