I have one of Samuel's cords and some of my own design. They all sound better to my ears than stock cords. Bummed to find out after careful AB tests that Samuel's more expensive cords sound even better with my gear than his company's less expensive cords.
I think Samuel's description of how cables work in relation to power supplies and digital noise in the AC circuits near your gear is pretty good. I also think that it is critical to make sure primary signals in low current ic's, speaker cables and even low power circuits inside your gear are effectively shielded from emf and rfi around the high current cables in the immediate neighborhood. In some ways, it doesn't so much matter what is going on with the many feet of unshielded cable in your walls as long as you are effectively dealing with radiation, interference and noise potentially present in the area directly behind your equipment. This is also why it is commonly suggested that you cross PCs with ic's and sc's at 90 degrees rather than running them in parallel, and never bundle low current and high current cables together.
I think Samuel's description of how cables work in relation to power supplies and digital noise in the AC circuits near your gear is pretty good. I also think that it is critical to make sure primary signals in low current ic's, speaker cables and even low power circuits inside your gear are effectively shielded from emf and rfi around the high current cables in the immediate neighborhood. In some ways, it doesn't so much matter what is going on with the many feet of unshielded cable in your walls as long as you are effectively dealing with radiation, interference and noise potentially present in the area directly behind your equipment. This is also why it is commonly suggested that you cross PCs with ic's and sc's at 90 degrees rather than running them in parallel, and never bundle low current and high current cables together.