In previous post i published Improving performance Bass Amplifier, the bass booster using IC Op-Amp using or based on IC JRC4558, LF353, TL072, TL082.
Turbo Bass with IC LM324 Circuit Diagram
PCB Layout Turbo Bass with IC LM324
See also this PCB Design Video :
Circuit above need 12Volt - 15 Volt DC symmetrical voltage power supply, and also using regulated and stabil power supply to more get high quality audio output power amplifier. Its simple and more usefull for boost your bass tone. If you have any question , please place your comment below.