Sorry! I really forgot that.
It was more than 4 years ago, but I remember (after a long burn in of the Cardas) better sense of density, richer voices, better mid-bass fullness and bass impact, more harmonics, more real and natural timbre and better dynamics than the stock power cord, with a bit of sparkle typical of the Golden Ref. power cords.
Now I changed house and I made a dedicated line for the Purepower with 10 meters of an industrial, "hospital grade" cable 12 AWG(3,31sq)x3 with double insulation (good for medical UPS), terminated with Oyaide C279 gold plated 20A IEC plug.
No other contacts, a single cable with good gauge from the power panel to the regenerator, only the C279, it makes sense but I could not ever try other solutions here.
I still have an Oyaide SWD-GX gold Shuko wall inlet, I used in the old house, never installed here; I should install an external box for the SWD without cutting the dedicated line and try again an aftermarket cable with 20A IEC.
Before moving from old house I installed the C279 gold 20A IEC on an Oyaide Tunami GPX of mine instead of its C046 gold/palladium IEC, the result was better to my ears in that room than the 20A Cardas G.Ref. : smoother, quieter, more dynamic, powerful sound with better bass impact and no added sparkle.
I think Oyaide Tunami with its impressive gauge (I opened it to install the C279) of 5,5sq (it was difficult to fit in the C279, while its C046 "special edition" have larger holes) is a great solution for regenerators.
I have to try it in my new room.