Low Pass Filter Subwoofer Preamplifier LPF Board

Description 1, adjust the selected potentiometer tightly, the inputs and outputs use pure copper terminals, and the wiring is very convenient. 2, 4558 op amo selected, the soldered IC bracket can still replace the amplifier, and experience different effects to improve playability. 4, Simple and beautiful board design, reasonable wiring, making the board have a very high signal-to-noise ratio and strong anti-interference ability. When there is no signal input near the speaker, you can almost hear noise. Remark: This board is a preamp board, it cannot be directly connected to the speaker. It must be connected to the next stage of an amplifier board for this preamp to work. The so-called low pass filter to filter the human voice map is more than the triple part, the low-frequency part is amplified to improve bass reproduction efforts, and people will not hear the sound of musical instruments and the high-frequency sound during playback. The buyer should understand knowledge of this area. Characteristics: Supply voltage: Dual DC 12V and 25V power supply Ifier, can not be directly connected to the speaker The multistage filter, a better bass effect Adjustable phase Potentiometer from left to right: bass volume control The cut-off frequency: is 22HZ-240HZ BOARD size: Type I: 4.3x5cmm,  thickness: 1.6mm Audio input: mono or two channels Audio output: Mono (connection with amplifier)