Sell DC 9-32V Low Pass Filter Bass Subwoofer Pre-AMP Amplifier Board with Bass volume adjustment best price

description: note: The board is a preamplifier board and cannot be connected directly to the speaker. It must be connected to the rear stage of the amplifier board to operate the preamplifier. The so-called low-pass filter, used to filter the human body soundboard is not only a triangular piece, but also keeps the low-frequency part amplified to improve the strength of the bass reproduction. People will not hear the sound of the instrument, nor will they hear the high-frequency sound playback. . The buyer must have knowledge of the field. feature: Power supply voltage: DC 9 V-32 V single power supply Two-channel input, subwoofer output, then output amplifier | ifier, cannot be directly connected to the speaker Multi-stage filter for better bass Adjustable phase Potentiometer from left to right: frequency setting, bass volume control Cutting frequency: 22 HZ-240 HZ Potentiometer shaft center distance: 3 cm PCB size: 62 9 * 26.5mm