audiophile low pass filter

Are you sure you want a low pass? It is more common to need a high pass to block low frequency rumble.

Check the link below. I use this type in a high pass application to keep my main speakers from seeing anything below 100Hz. I don't suffer anything by using them. They came at the recommendation of the speaker manufacturer.

http://www.partsexpress.com/webpage.cfm?WebPage_ID=3

Good luck.

I meant low pass as I stated. Jwmazur, speakers have absolutely nothing to do with this thread.

Off topic aside: You can do high pass for rumble in the digital domain.

After looking into this a little more closely, it appears that what I'm looking for is referred to as a "digital mastering processor." It incorporates a low pass filter with the ADC. See, for instance, the Drawmer DC2476.