Dedicated AC lines???

aluminum is inductive and therefore susceptible to RFI.
does somebody know the cost of the JPS in wall cable?

Sean, I'm sorry to have caused confusion. I do not advocate the use of aluminum wire. What I meant was that, if possible, use Aluminum flex in which to put your Solid copper THHN wire in. (This would be practical in an installation in a attic. If the run had to be made outdoors,
then whatever the electrical codes would detate the choice of materials.) Sometimes you have no choice but to run romex. If one is able to have a choice, IMHO, having solid
copper THHN wire inside of Aluminum flex, is a better than having
a run of romex.(I believe it has to do with the proximity of the ground wire where it is situated in romex.)How much of this
has a sonic effect is debatable. Any dedicated line properly
installed will improve the sound of your components. Bill

I thought pvc conduit was the conventional thinking for reducing RFI/EMI.

The "aluminum" sheathed copper cable Kotta speaks of is commonly called MC cable. It is a commercial grade "romex" that can contain 1 or 2 conductors, a neutral and a ground wire. It typicaly comes in 14, 12 and 10 ga. solid copper conductor sizes. Hope this helps.

Thank you all for your inputs! I have read the archives A to Z and gotten much useful info.