SUB-1STR Subwoofer Low Pass Filter 
Electronic Crossover DIY KIT For Active Subwoofer
Discrete Transistors Filter Stage
Very Small Size PCB
2 Order Option:
1. PCB with components Assembled Ready to Use
2. DIY KIT You need to Place and solder all the components
 High quality Product and reliability FR4 1.6MM PCB
Stereo Input To Mono Output

Working Voltage : Single 12-24Vdc
Current Consumption: 8mA
Amplification: 1:1
Frequency Control : 
Low Pass Filter adjustable 40-250Hz 12db (can be changed by request)
PCB Size: 55mm*35mm double-sided HAL,FR4 1.6MM
Potentiometer Gap: 30mm (Center to Center)