Subwoofer Low Pass Filter With Gain & Frequency (Bass booster)

In this video, I have shown a sallen key-based low pass filter circuit that uses the NE5532 ic I miss spoke in the video. The mic doesn't justify the sound quality but have my words make your own you will love it. Frequency and gain can be adjusted.
Circuit diagram link - drive.google.c...
Parts list:-
ID Name Designator Quantity
1 supply -12V 0+12V 1
2 104K C1,C4 2
3 100uF C2,C3 2
4 39pf C5 1
5 10uF C6 1
6 104 C7,C8 2
7 47k FREQUENCY 1
8 100k GAIN 1
9 33k R1 R0805 1
10 4.7k R2 R0805 1
11 220 R5 R0805 1
12 4.7k R6 1
13 4558D U4 1
Music credits
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Song
NEFFEX - Cold ❄️[Copyright Free]
Artist - NEFFEX
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Thanks for watching #SK Electronics

[@tibby1239]

How can u make a 4th order low pass filter at 24db octave

[@electrostar1510]

Boss , I need circuit diagram , but , I tried to download from your link ,but not downloaded, can you send me the circuit diagram from any other way...

[@SKElectronics]

drive.google.com/file/d/1kQGxcKG3vzI-S6LzCcpoYX3msgz2Oj2F/view?usp=drivesdk

[@gamer.08.61]

Should I use AC or DC voltage? - What does 12 volts mean?

[@SKElectronics]

@@gamer.08.61 dc.

[@gamer.08.61]

@SKElectronics What does 0 volts in the diagram mean?

[@navidparsa1011]

This circuit build with ne5532 or 4558?

[@SKElectronics]

u can used either of therm.

[@monst172]

Bhaiji give me a kit

[@Nationalpalsana]

Please talk to you in HINDI 🙏😳