The board features:1. All components are selected as the new first-class products. The frequency adjustment capacitors are made of the original Philips CBB capacitors. The adjustment potentiometers are made of fully sealed type. The input and output terminals are made of pure copper terminals. The wiring is very convenient.2. The op amp is selected from NE5532. The IC seat can be soldered at any time to change the op amp, and the effect brought by different op amps can be improved.3, designed with LED indicators to monitor the power status in real time.4. The PCB design of the board is simple and beautiful, and the wiring is reasonable, which makes the board have a very high signal-to-noise ratio and strong anti-interference ability. There is almost no noise near the horn when there is no signal input. The main parameters:Power supply voltage: DC10-24V single power supply DCFrequency range: 22Hz-300HzAudio input: mono or dual channelAudio output: monoPCB specification: 78x32mm, thickness: 1.6mmPCB material: super hardness FR-4 fiberglass boardFinished board net weight: 30gPlate fixing hole center spacing: 70x24mm, hole diameter: 3.2mmPotentiometer shaft center distance: 32.5mm

Special reminder:

This board is a heavy bass preamp board. It will not sound when directly connected to the speaker. It must be connected to a pure final stage power amplifier board to make an active subwoofer. The power of the pure final stage power amplifier board is shocked according to individual needs. The degree of selection, the higher the power of the pure final stage power amplifier, the more shocking the bass effect. The so-called low-pass filter board filters out the high-pitched parts above the human voice, and retains the low-frequency part to zoom in to improve the bass playback strength, and does not hear human voices and high-frequency instrument sounds during playback. Buyers must understand this knowledge to avoid using it and not knowing how to use it. Most of the subwoofers in the market are basically dual-powered. It is not very convenient for the majority of DIY enthusiasts to use. After all, the single power supply is easier to find. Under the premise of ensuring the effect, we have introduced a single-supply super bass. The board can be used to share a set of power supplies with the power amplifier board. The DIY is very convenient. 

Shipping list:1 x low-pass plate, random color plastic potentiometer cap 2