The Xtenzi XTBR33 is a replacement Bass Gain/Volume Remote Level Control for compatible Z-II and Z-SP Series amplifiers. This control knob allows smooth bass level adjustment directly from the driver's seat, making it ideal for restoring remote functionality when the original Z-BR II remote is missing, damaged, or no longer working. Simple to install, reliable in performance, and built to OEM standards. Compatible Amplifier Models: Z-150.2 SP Z-400.2 SP Z-150.4 SP Z-150.6 SP Z-150.2 II Z-150.4 II Z-150.6 II Z-1KD II Z-2KD II Z-3KD II Product Details: Brand: Xtenzi Model: XTBR33 Replacement remote for: Z-BR II Remote Level Control Control Type: Bass Gain / Volume Adjustment Knob Series Compatibility: Z-II and Z-SP amplifier models Color: Black Installation Notes: Connecting this remote will override the amplifier's onboard Bass EQ adjustment. Plugs directly into the Remote Level Control Port on compatible amplifier units. Allows secondary gain control from the front seat for quick bass tuning. Package Contents: Xtenzi XTBR33 Remote Bass Control Knob x 1 Mounting Screws (if included) User/Installation Instructions Caution Before Purchase: This is not a universal remote. Only works with supported Z-II and Z-SP amplifiers. Please verify that your amplifier model is listed before ordering.