Spkr, interconects, or power cable upgrade first?

Power cords first, i/c's second, s/c's third, IMHO.

Cheers,
John

Not arguing with those advocating addressing power cords first. I do suspect benefits of the change will depend on which (PC, IC, SP) is the "weakest link" in the chain...that is, which is doing the most to limit or degrade signal generation or transfer. In my case, I doubt I'd have heard an improvement had I changed power cords prior to addressing speaker cables given their oxidized state. Maybe the generic answer is to change out that piece first that is furthest away from "state of the art" - or maybe make that furthest away from "best of the art" available with a specific budget.

if you can borrow a set or sets of cables, that is ic, spkr and pc, listen to the differences between each one and decide for yourself.

my own experiences point to equal weight on all cables.
therefore, i don't think it matters in which direction to go at first.

There is always noise riding on the AC power. Removing it is a 1st step to enable better analyzing other possible upgrades. A used MIT Shotgun AC1 proved economical & effective in my system. Experienced pros know the hierarchy of improvement starts at the source-power.Good luck.