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.
No extra parts needed, just some calculation and some trails.
There was a thread on this subject not long ago:
http://www.diyaudio.com/forums/anal...ore-effective-than-just-high-pass-filter.html
http://www.diyaudio.com/forums/anal...ore-effective-than-just-high-pass-filter.html
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