welcome to another interesting topic of Audio amplifiers. The subwoofer amplifier board. This board has to be made with 5 preset adjustment, The 4 presets represents the frequency adjustment and one preset for the Gain adjustment. This board can easily drive High power subwoofer amplifier boards. Providing output with high quality and it will not allow to pass any vocal to the output stage, Means the pure bass frequency range from 40 Hz to 120 Hz will delivered.
Buy 5 Preset subwoofer low pass filter board from Amazon CLICK HERE
Low pass filter board circuit diagram
Find some better company to see the 5 preset sub-woofer preamp. AMAZON India is total garbage. Selling stuffs at ten times the price. Please share the circuit in case the board is not available
Plz add circuit diagram or PCB backside.
Not possible to make with the given photo