Wzxksoac 4X Low Pass Filter Bass Subwoofer Preamp Amplifier Board Single Power DC 9-32V Preamplifier with Bass Volume Adjustment

The multi-stage filter, better bass effect.The phase adjustable Dual channel input, subwoofer output, then the output amp|ifier,can not directly connected to the speaker The so-called low-pass filter to filter out the human voice board is more than treble part, retain the low frequency part is amplified to improve the bass reproduction efforts, people not hear the sound of musical instruments and high-frequency sound during playback. The buyer must understand knowledge of this area. Power supply voltage: DC 9V-32V single power supply Potentiometer from left to right: frequency adjustment, bass volume control