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

For me it was not until the majority of my system was up to par THEN I started hearing real differences between different levels of quality interconnect and speaker cables. My ranking is closer to @audphile1, but swapping 3 & 4. 

@audphile1 Thanks for the further detail. 

And I suppose it goes without saying that unless one has tried a very good cable for any of the above, one cannot really know what they're missing.

@hilde45 correct. And to add to the power cord conversation…not all power cords work equally well on all components. The only exception I found so far is the Audience AU24se power cable that worked very well on all 3 DACs that I had over the last 1-2 years. It wasn’t great on amplifiers or preamps. I’ve also had power cords that worked great on one amp and not as well on other amps. It’s all about trying and finding what works best.

@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.