All of the above plus something easy to use to separate cables is the tubed foam pipe wrap that often comes in 3 or 4-foot lengths and maybe in a bag of 8 pieces for a couple of bucks. Get the material that is about 2 inches in outside diameter and has about a one-inch diameter inner hole. These tubes are already split in half but need to be pulled apart.
You can cut pieces as short as a couple of inches and wrap around your cables at crossing points so they do not touch. These tubes also work pretty good at providing separation between dual-run bi-wire speaker cables. I am sure the material itself is not the greatest dielectric but because it is foam it is mostly air.
You can cut pieces as short as a couple of inches and wrap around your cables at crossing points so they do not touch. These tubes also work pretty good at providing separation between dual-run bi-wire speaker cables. I am sure the material itself is not the greatest dielectric but because it is foam it is mostly air.