subsonic filter for vinyl

[merlin el mago]

There is a good way to implement a passive subsonic filter?

TIA
Felipe

 

[Frank Berry]

You'll need an active filter for the sharp low frequency cutoff. Anything passive will have a big impact on low frequency audio. Even so, it won't be very effective at removing the sub 20Hz rumble and warp noise.

 

[merlin el mago]

Thanks for input, any schematic?

 

[Koifarm]

If you have mutiple stages, you can adjust the output capacitor to a value to create a lowpas 6db filter at 12Hz. If there are 3 stages you get 18db lowpas/ rumble filter or even with 4 stages 24db rumble filter.

No extra parts needed, just some calculation and some trails.

 

[merlin el mago]

Isn't for me, so I need an external unit.

 

[lcsaszar]

There was a thread on this subject not long ago:

http://www.diyaudio.com/forums/anal...ore-effective-than-just-high-pass-filter.html

 

[merlin el mago]

Thanks osifis I see what not clear the filter you propose....