You were fortunate enough that your speakers had a high enough impedance that it didn't smoke your sound card. And you'd only get a couple watts at best. I have no doubt it at least worked by I do question just how well. A couple of watts will take you farther than most might realize but I'd bet that your soundcard was struggling to do that and I have to wonder just how much distortion there was.
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Q6600 @ 3.83GHz w/ D-Tek Fusion
Asus P5Q-PRO
2x 2GB PC8000 Mushkin Redlines @ 1020MHz w/5-5-5-12 timings
EVGA GTX 280 (SC?)
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