This is my DIY project try make audio processor that can work with single supply 12Volt DC and you can use it for any of your audio system that have 12V psu in it. If you need to use for car, you may need L-C filter to minimize the engine noise.

Audio processor using to controll sound from the input signal to the main amplifier. You can boost or cut some frequency according to your need easily. It is like tone control function but with more complicated adjustment.

This audio processor has some feature like : Bottom level, Phase controll, Body level, and Edge level.

I design this audio processor based on transistor 2N5551 and it use standart parts that you can find easily on the market.

what does it sounds like? and how to adjust ?

please check the video on barlex respectaizer youtube channel