Believe what you want. The only perfect dielectric is a vacuum(second best is air). All other dielectric materials absorb energy(it's called, "dielectric absorption") and in a cable, will release it with a slight delay(not desirable for a number of audible reasons). Capacitors will do the same thing, only with more obvious results: (http://www.national.com/rap/Application/0,1570,28,00.html) The better cables and capacitors available use polyethylene, polypropylene, polystyrene, Teflon or foam with high air content dielectrics to avoid the problem. They are slower to absorb and absorb less energy. That's why these cables, interconnects and caps take longer to "burn-in", but(ultimately) sound much better. Make that: "don't sound" as transparency(adding or taking away nothing from the original signal) SHOULD be the ultimate goal of a cable, cap or interconnect. But that's just what I personally look for in those components.