Turbo Bass or Bass Booster Circuit

This a Turbo Bass Circuit that used single IC LM324 based op-amp amplifying low signal input-output. By using IC LM324 have two op-amps as two part. The first part as U1 in circuit diagram is used to buffer the audio input signal and the signal will be filtered by the second part as U2. Which the second filter can give more bass and eliminate the High-Frequency signal. So this circuit very