I am still using the same amps, Bob Carver Raven 350. I have never had a speaker cable affect the sound quality as much as the Fidelium cables did. Best I could describe them is they acted like a big resistor. I seem to remember a posting stating they can create an impendence mismatch with some equipment.
I am now using the Townshend F1 speaker cables and am very impressed with them.
ozzy