Guys, I am in total agreement about the need for settling time between duty cycles to get the wire/dielectric broken in. That is why a darned 'fridge is a great burn in tool. I use a 1/2HP motor with a timer circuit to break-in power cables. The starting spike is beneficial to the process - 12A on start: 5A at run... repeat as necessary.
Power cables will be best served by getting them off of carpet with an insulating riser and then leave 'em alone! Pete is the MAN when it comes to power cables and power transmission. That is his day job and he knows more about AC power than many self proclaimed expurtz. His cables are all DO and no hype. Like them all.
Wire is weird. Rather the dielectrics are weird. PVC, teflon, polyethelene, polypropylene, cloth, all are different in DA and this is a big deal. I think that is one of the reasons fabric or other organic coverings sound the best - very little dielectric memory.
One observation about digital. It is my experience that digital be left on all of the time to get happy. I'm not sure why, I just know it to be true at least for me and my friends. I think that part of the equation is constant energization of the output cable to its destination device. I do know that my DAC needs to stabilize the heat of the DAC chip to sound the best.