Subsonic Line level filter

[duaneage]

Does anyone have a schematic for a line level passive filter <20 Hz? I need something between my pre amp and sound card to cut turntable rumble out. The sub sonic filter on my preamp cuts it before the volume and tone controls but not the rec out.
I used to have a diagram that used 100 K resistors and .01 uf caps but I lost it. I think it was designed to be -20 db @ 10 Hz with 12 db/oct. pity I don't remember the exact values or configuration.

I am trying to avoid using op amps, too much hassle.

[John W]

I have built and used the one described here. It works very well, but it does use opamps.
http://sound.westhost.com/project99.htm

[duaneage]

Thanks for the link I found these input filters called F-Mods that claim to roll off at 20 Hz but at 40 dollars a pair they seem a bit overpriced.