SUB-7 Subwoofer Low Pass Filter 
Electronic Crossover For Active Subwoofer
With 0/180 degrees Phase Control switch
Very Small Size PCB
PCB with components Assembled Ready to Use
High quality Product and reliability FR4 1.6MM PCB
Stereo Input To Mono Output
Working Voltage : Dual 12-15Vdc (+15Vdc 0 -15Vdc)
Current Consumption: 12mA
Frequency Control : 
Low Pass Filter adjustable 45-250Hz 12db
PCB Size: 55mm*36mm double-sided HAL,FR4 1.6MM
Potentiometer Gap: 25mm (Center to Center)