I bi-wired my studio 60's and noticed a difference and it was small but there was a difference. Now I tryed doing a passive bi-amp using my Pioneer ELITE 94 and there is even a bigger difference. What i've noticed the most is more base. I went back to straight 10 gauge with out bi-wiring and it sounded more flat to me, it still sounded good but not as crisp in comparison. I'm now back to bi-amp and I think thats my favorite so far, call me crazy call me what ya want
but I definitely without a dought no matter how small noticed a difference. I think thats half the fun is trying different things whether its speaker placement or wires. Maybe it depends on your speaker and or receiver but there is a noticble difference to "me" with my HT setup