MSS-2 
18db High Quality Stereo Subsonic Filter
Standard Freq. 20Hz (Can Be Changed by buyer request)
3rd Order High Pass Filter Avoid very low vibrations and frequencies caused by turntables/vinels

Excellent Performance
2 Order Option:
1.Board that work with Single 9-15Vdc
2.Board that work with Single 15-30Vdc
 High quality and reliability PCB FR4 1.6MM
Input/Output & Power Supply Connectors will supply
Working Voltage : 9-15Vdc or 15-30Vdc
Gain Level 0db (1:1 Ratio)
Filter: 20Hz 18db/octave 3rd order High Pass Filter
PCB Size: 
MSS-2 59mm*28mm double-sided HAL,FR4 1.6MM