About External or Remote Bass Controls | MTX Audio - Serious About Sound®
CT Sounds Universal Bass Knob | How To Install - YouTube
JL Audio RBC-1 Remote Bass Control For Mono Amps - www.strathfieldcarradios.com.au
Kenwood XR1001-1 Reference Fit Mono Power Amplifier with 1000W x 1 output at 2 ohms, 2000W maximum power, Bass Knob Included, Speaker level Inputs and Signal Sensing Turn On - Creative Audio