Highpass filter using sound card???

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Hey guys-
First post, long time reader...
anyway I was wondering as all of my audio goes through my computer (i built a HTPC) I was wondering if there was any way i could get a highpass filter built into my computer either via soundcard or some sort of software. Right now im running my audio through my motherboard's onboard audio which seems to be okay (Asus P5AD2 Deluxe). But, i wanted to make sure that I didnt blow out my speakers and thus wanted to cut out frequencies <20hz. Is this at all possible in any way?

Thanks!
~Sonny
 
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