Designed for the Ref Four Amplifier: Official B2 Audio bass knob built specifically for seamless integration with the Ref Four. Full System Control: Adjust bass levels on the fly with the smooth precision control knob. Advanced Monitoring: Power/Voltage selector plus LED Voltage/Temperature readout with Celsius/Fahrenheit option. Safety Indicators: Integrated Power and Clip lights keep your system protected and easy to monitor. Premium Build: Durable metal casing with the B2 logo in white, paired with included CAT5 cable for reliable connection. B2 Audio Ref Four Bass Knob Controller with Level Voltage Temp & Clip Indicators This Listing Includes: (1) B2 Audio Ref Four Bassknob Controller (1) CAT5 Cable (2) Installation Screws Take command of your bass with the official B2 Audio Ref Four Bassknob, built to match the performance and precision of the legendary Ref Four amplifier. Crafted with a durable metal casing and finished with the bold B2 logo in white, this bass controller gives you full system control with style and reliability. Features: Level control knob for precise bass adjustment Power/Voltage selector switch Power and Clip indicator lights LED Voltage/Temperature selector Celsius/Fahrenheit toggle switch Heavy-duty metal casing with B2 branding Perfect For: Users of the B2 Audio Ref Four amplifier who want a high-quality external bass control with advanced monitoring features.