Which cable has most impact - IC, Spkr., power?

I feel that interconnects are most critical, closely followed by speaker cables. Power cables are the least critical in my systems but I always start with a 20a dedicated circuit - sometimes multiple 20a dedicated circuits.

my 2 cents

happy listening!

...like I said, nowhere!

My experience is that everyone's components react differently to cabling, as is everyone's power quality. Never has YMMV been more true.

For me Power Cords make the biggest improvement
with my Krell gear. I am suspecting that high dollar
powercords filter noise out of the A/C without suppressing
the current flow (like those nasty monstercable power
conditioners). But no matter the reason all I can say
is power cords can transform a system more so than
anything else in my experience.

Amp--->Speaker

Is there a consensus yet? Good, I'm not too late.
For me it's speaker cable. The only times I hear a difference that I truly believe is there is when making changes to speaker cables.
With ICs there has never been a noticeable change. I have tried some pretty spicy cables so maybe my sonic taste buds aren't sensitive enough.
Same with power cables. No change. I'm thinking either my equipment does it's own filtering, as any properly designed piece should, or my AC is clean. I know the AC is clean so probably a combination of many factors including a healthy dose of skepticism.