Lanzar OPTIX3B Optidrive 3 Way Electronic Crossover Network with Remote Bass Boost Level Control
Blue Light Illuminated Control Panel Removable Covers For Power And In/Output Ports. Rotary Control Knobs 12db Per Octave Crossover Slopes  PWM Power Supply Subwoofer Mode Switch Remote Bass Boost (0-+18db) And Level Controls Variable Subwoofer Frequency Control 40-400 Hz  Variable High-Pass Frequency Control (Mid-Range) 40-800Hz Variable Low-Pass Frequency Control (Mid-Range) 2k-7 Khz Variable High-Pass Frequency Control (40-8 Khz) X1, X10 High Pass Frequency Multiplier-Switch Parametric -InchQ-Inch Control (2-20) Left And Right Mid Range Phase Shift Control (0-180)  Variable Bass Boost Frequency Control 25-250 Hz Band Pass/ High Pass Control Switch Subwoofer Stereo/Mono Mode Control Mid/High Sub RCA Inputs  High, Mid Sub RCA Outputs Variable Output Level Controls, 7 Volts Dimensions : 6-InchW X 1.75-InchH X 12.69-InchL