Cable differences -- power, interconnect, digital, and in what order?

@audphile1 ...And to add to the power cord conversation…not all power cords work equally well on all components.

audiphile1, If you had to pick using a higher end 1.5M power cord (from a very established cable manufacturer), for use between a solid state DAC with internal transformer -vs-. a tube preamplifier with an external transformer - what would be your preference, and why - if you care to share more?.

Notes: Both components are plugged into a Richard Gray Power Station right now. Nice dark background, as-is. If it matters, I do use the preamp for other inputs however, most serious listening is for components through the dac itself.

@decooney is the power cable on RG of equal or better quality than the power cables on your source and preamp?
As to answering your question…I would try it and determine where it works best. I would also try to see what it sounds like with the higher end cord on preamp direct into wall outlet bypassing the power conditioner, especially if you have a dedicated line. Probably not the answer you were looking for, but there’s really no substitute for a listening test. 

@audphile1 is the power cable on RG of equal or better quality than the power cables on your source and preamp?

Interesting question. Similar quality, not one too much greater than the other. This is another reason I may step up and try a potentially better PC for source or preamp, or at least a demo/test down the road. I don't have 5 dedicated outlets in my current room, and chose the path of RG for now, instead. Works pretty good.

After I ran two dedicated lines, I actually prefer the sound of my Pass XP22 preamp when connected direct to outlet. It wasn’t the case prior to implementing the dedicated circuits. 

I researched this a couple of years ago and the somewhat rough general answer was:

1. Power
2. Speaker
3. Interconnects

Iconoclast has (power cables excluded):

1. Speaker
2. analog xlr
3. analog rca
4. digital