Product Name: Single power supply low-pass filter board, subwoofer front panel Special reminder: This board is a subwoofer preamp board, directly connected to the speaker, it will not produce sound. It must be connected to a pure post amplifier board to make an active subwoofer to produce sound. The power of the pure post amplifier board is shocking according to personal needs. The degree of selection, the greater the power of the pure power amplifier, the more shocking the bass effect. The so-called low-pass filter board filters out the high-pitched part above the human voice, and retains the low-frequency part to amplify to increase the bass reproduction strength. Human voice and high-frequency instrument sound will not be heard during playback. Buyers must understand this knowledge to avoid not knowing how to use it after buying it. Most subwoofer pre-boards on the market basically have dual power supplies. It is not very convenient for the majority of DIY enthusiasts. After all, a single power supply is easier to find. Under the premise of ensuring the effect, we launched a single power supply super bass front The board can share a power supply with the power amplifier board, which is very convenient for DIY. 1. All components are selected from brand- first-class products, the frequency adjustment capacitors are for CBB capacitors, the adjustment potentiometers are Taiwan-made fully sealed type, and the input and output terminals are pure copper terminals, which is very convenient for wiring. 2. Dezhou NE5532 is selected as the op amp, and the IC socket can be replaced at any time, so you can feel the effects of different op amps and improve the playability. 3. The LED indicator is designed to monitor the power supply status in real time. 4. The PCB design of this board is simple and beautiful, and the wiring is reasonable, which makes this board have a very high signal-to-noise ratio and strong anti-interference ability. When there is no signal input, close to