SUB-4K / SUB-5T 
High Quality Subwoofer Low Pass Filter Electronic Crossover For Active Subwoofer
 High quality Product and reliability FR4 1.6MM PCB
Stereo Input To Mono Output
Power Supply Input : min. 2x9Vdc to 2x16Vdc max. (+v 0 -v)
Current Consumption: 2X8mA max.
Phase Shift Control: Variable 0-180 SUB-4K / SUB-5T Switch
Frequency Control : Adjustable 40-250Hz 12db
Bass Boost Control : 0-15db @ 45Hz
PCB Size: 
SUB-4K: 94mm*37mm Green double-sided HAL,FR4 1.6MM
SUB-5T: 81mm*38mm Green double-sided HAL,FR4 1.6MM
Potentiometer Gap: 25mm (Center to Center)