Do a blind test and listen.Did you change the cables? Or did you have someone assist and you did the listening? Its important that you just listen and not know what cable is which.Then and only then can it be called a DOUBLE blind listening test.Also was your head in the same spot? The reason is that it could be nothing more then a comb effect. And I don't mean hair care.
A New Believer
I have listened to many systems over the years, and have never appreciated the difference speaker cables can make to a sound. In fact, I was so skeptical of the sound changes they can make that I have always not bothered with any special type of cables, generally going for generic (and dare I say it) roughly made ANY copper wire plugged in to amp and speaker. Well, imagine my surprise when I decided to do a blind test and listen to what difference cabling can make. Wow, my Vand 3A Sig's had been getting strangled! (some of you guys may want to strangle me if I told you what connects I had been using). So I am now a firm believer, cables DO make a difference.