Being somewhat skeptical, I chose to make my own PCs AND dedicated lines at the same time from Belden 83802, which is 12AWG/2 with shield, using only FEP (Teflon) as insulation. So the 30-50 feet from my service panel is ONLY this stuff. At $2/ft it was easy to make a separate line for the CDP, pre, and two for the monos.
I must say I hear a difference. My already-dead-quiet system seems clearer, cleaner, maybe a bit more dynamic. No spectral shifts (fortunately). Differences in interconnects are now more readily discernible.
I might buy another 100 ft spool of this stuff if any of you want some for lines or cables. $2.50/ft if I do it.
I think there's somebody out there selling it for $3/ft.
100 ft spool sells for about $200 shipped.
I don't really buy this notion about 6 feet of PC "resonance" that has an effect on the system downstream.
Changing ALL of it to clean copper in Teflon inexpensively just seems like a simple semi-scientific no-brainer without all the high-priced alchemy. Cheers. Ernie