2) NEW KICKER ZXRC Bass Remote Control Knob For ZX Amplifiers Amps 10ZXRC Compatible with any KICKER amp with a REMOTE BASS jack on its end panel ZX (2011 or older version) Allows the driver to control bass levels while driving Easy installation Included all mounting hardware (screws and brackets) Dimensions: 2-1/8" (D) x 2-1/4" (W) x 1-1/4" (H)