Importance of power cable for Turntable?

Actually turntable power supplies are one of the most sensitive areas in an entire system for power cord upgrades.  I just recently helped a local audiophile change the cord running from his VPI SDS to his HRX (so this is the one after the voltage has been smoothed and cleaned) the effect was not subtle. I get the same from changes to the cord into my EAR table supply.

If/when you get a table you can simply swap the cord from your digital source and listen, you may well be surprised!

While all this thinking about noise from/to the table may be true (or may be better addressed by other steps as the OP suggests) my experience is that even when the AC is treated (as in my system) by multiple levels of filtering well before the power cord to the table it still is the case that changing the power cord to the table adds benefits. The effect is similar to a good power cord on an amp -- more stability and attack, more ease as the table is subject to wide dynamic swings, a crisper presentation etc.

All of this is icing on the cake in an optimized system but if that's where you are heading, and you have a power cord handy, do try one -- the effects are likely to be additive to whatever else you are doing (and that's before getting into the benefits of footers and other vibration control effects on the TT PSU as well ...)

Of course I may well be totally lost in tweakery woo land ... but that's the territory we're operating in now

@nyev while I can appreciate the desire to find a cost effective system wide approach to power management, or frankly to tweaking in general, the reality is that it doesn’t work this way because the effect of tweaks is cumulative and in fact delivers increasing, not diminishing returns. 

What I mean is that the more you tweak (or tune to use another’s language) the system the more resolving it gets and the more you appreciate further changes. 

The good news is that it frankly doesn’t matter what order you do things in, especially when it comes to power management (unlike room acoustics say where one problem can mask others). Start simply with dedicated lines and outlets, maybe add a conditioner, sprinkle power cords to taste and then obsess about bases and footers for the cords and conditioners. You’ll soon learn that everything matters.

Above all have fun and listen carefully at every step on the way 😁 and don’t fall for any single manufacturers special sauce, try a few and find what you like and what works for you

@lewm Believing in differences in power cords, and being open to hearing them, presupposes that you value many more parameters in a cord design than current carrying capacity. Choice of materials (copper vs silver for example), geometry, resistance to vibration, damping, grounding and shielding solutions (such as active shields) - all of these influence and affect power cord performance and the effect can easily be appreciated on a table supply. And the cable doesn’t need to be expensive, choosing the right cable design is the key,

For instance the best cable for a table may not be the best cable for a pre amp say. For example I find Marigo power cords work really well on the table PSU but on my pre amp the same cord seems thin and forced. The ideal cable profile for a table is one that is lean and fast it seems.

and @bdp24 while the thoughts about my system are welcome (you must come round and hear it now, it’s a world away from what you heard last year) the same impact was clear on my friends system which is much much less expensive and complex

@bdp24 well perhaps yes and no -- its even more ruthlessly revealing, but I think in a more natural and unforced way. In a recent demo I turned the Herzan on and off and the person I was demoing it with preferred the sound without the Herzan -- its more laid back, kind of soft and wooly but it's not real, and the detail is gone. Similarly I found with the M3s that I could hear the haze and coloration in the ARC pre-amp and so that had to go. So overall it's probably not moved in the direction your panels take you and is probably more yin then the yang you may prefer. But the tonal balance is better especially without the  super tweeter which over energized the top end.

a musical reproduction system transparent enough to let the best recordings reach their full potential, yet not so ruthlessly revealing as to make lower sound quality recordings be unlistenable!

Actually my experience is that a transparent system will bring out the best in any recording, no matter how flawed. I want to hear what the artists were doing, warts and all, I can listen through recording errors and would much rather it was given me straight than sugar coated. Certainly in my current setup I've yet to find a disc "unlistenable" and am enjoying lots of things I'd previously written off

As to the Sopranino -- while it added extra clarity, air and space there was certainly some discontinuity between it and the Be tweeter on the Q3 and in the room interaction I found the need to tone things down -- since then I've gone to more transparent settings on the SR gear (silvers vs golds) and no longer feel there's any high end discontinuity -- but it's certainly still on the "hyper detailed" end of the spectrum, kind of what I like I think