50 hz booster circuit for subwoofer

[jaya000]

I saw subwoofer amplifier with 18db 50hz bass boost.
I want to know about the circuit design of the same & wish to make one myself.

[myhrrhleine]

Originally posted by jaya000
I saw subwoofer amplifier with 18db 50hz bass boost.
I want to know about the circuit design of the same & wish to make one myself.

If all you want is 50Hz boost, use an equaliser circuit.
Just build one circuit for the one frequency.
If you want a circuit to correct for bass deficiency, then I recommend the correction circuit Linkwitz developed.
http://www.linkwitzlab.com/

[tinitus]

http://sound.westhost.com/projects.htm

If I remember correct there are different options

But 18db at 50hz sound weird

[AndrewT]

18db of boost requires a lot of extra bass power delivery and bass power handling.
18db=63times.
Send in 1W to the normal speaker and you need 63W to handle the bass boost.
If the main signal goes to 50W on a peak signal you now need 3150W capability in the bass department.

[jaya000]

I got the circuit.
Now i want to know more about this circuit design.
I think U5- A is used for 50hz boost purpose.
What formula is used for this?
If i want to change 50hz boost to 70hz?