Quality Power Cord


HI to everyone.

Need advice. I would like to replace stock power cord on
NAD C356DAC with the better one.
I've tried with the Signal Cable but it didn't work.
Lost highs, actually the sound became muffled with the "brushed" highs.
Any suggestions.
topten
AL, that's good research on the IEC.
Would a PC with a Screw-off ground pin perform with satisfactory results on the NAD C356DAC?

The Pangea Audio AC 14 XL is a quality cable and has such a feature.
http://www.audioadvisor.com/prodinfo.asp?number=PGAC14XLI
Al, Never mind my question. The cable just lifts the ground pin, it still is a 3 wire IEC. I'm a dummy.
I have tried following cables: Pangea AC-9mkII; AQ NRG-4;
Shunyata Venom 3 and all of them affected the sound (highs).
The best sound was with the tiny $1.00 stock power cable.
UNBELIEVABLE!
Uh, how was it that you paid $1 for a free stock cable, and why would you do such a thing?