Special reminder: the board is a subwoofer pre-subwoofer, it will ring when connected to a rear pure power amplifier like an active subwoofer, the power of the pure card rear power amplifier will be chosen according to personal needs, the last part of the power amplifier power effect more shocked. The low-pass filter card is intended to filter the human voice above the treble part, keep the low-frequency part of the amplification to improve the intensity of the bass, the playback does not hear the human sound and the high frequency of the instrument sound.

It is for professional DIY, must know how to use this kind of products.

Supply voltage: DC9V-32V DC single power supply
1. Two channel input, subwoofer output, the output should be connected to the amplifier board, can not be directly connected to the speaker
2. Multi-level filtering, bass better
3. Phase adjustment
4. Potentiometer from left to right: frequency adjustment, bass volume adjustment
5. Cut-off frequency: 22HZ-240HZ
6. Spacing of potentiometer axis center: 3 cm
7. PCB Size: 62 x 26.5 mm
Audio Input: Mono or Dual Channel
Audio output: Mono