I bought three twisted pairs of Paul Speltz's Anti-Cables about six-months ago. I use them for my front right, left and center channels. I would use them for my rear channels also, except those wires are built into my celing and are not accessable.
The cables made a very clear improvement in the sound of my system. The three dimensionality of the sound image staging was markedly improved, probably due to improved phase convergence. You can sharply tell where each player is located, if the recording is made properly.
In addition to improved staging, the beauty of the sound is also much improved, both for spoken voice and music. I had been using type-4 Audioquest speaker cables to my B&W speakers. The Speltz Anti-cables are far superior to the Audioquest cables. I use the same audio system for CD, DVD, and HDTV and all are improved with the Speltz cables.
I am a member of the Audio Society of Minnesota. We had a speaker cable duel meeting about a year ago and auditioned multiple sets of speaker cables with otherwise unchanged audio equipment and music source. It was a blind audition (we didn't know what cables we were listening to until it was all over). The Speltz cables were far and away the best, beating out some very expensive cable competitors. That meeting convinced me that speaker cables make a big difference in the sound of a system.
Paul Speltz also makes component interconnect cables of equally high quality. I highly recommend the Paul Speltz cables.
Jeremy Hollerman