Subwoofer low pass filter circuit diagram explanation

The sound spectrum is in the range of 20Hz to 20000Hz. It is difficult for a single speaker to reproduce the sound of the entire frequency range well, so the HIFI audio system will take out the bass part of the sound level and amplify it separately to send it to the independent bass speaker for sound reproduction, so that the shocking effect of the bass will be more prominent. The following will be such a low-pass filter, which is used to separate the bass part from the two-channel signal of ordinary audio equipment and send it to the bass amplifier.

Low pass filter circuit diagram

Component

R1 = 39 kOhm

R2 = 39 kOhm

R3 = 47 kOhm

R4 = 10 ohms

R5 = 22 kOhm

R6 = 4,7 kOhm

R7 = 22 kOhm

R8 = 4,7 kOhm

R9 = 10 ohms

R10 = 220 ohms

C1 = 39 pF

C2 = 0.1 uF

C3 = 0.1 uF

C4 = 0.2 uF

C5 = 0.4 uF

C6 = 0.1 uF

C7 = 0.1 uF

IC1 = TL064

Printed Circuit Board

Component location