Power Cord for Synergistic Research MCC

Thank you for you guys sharing your experience.
Hi Bob,
Agreed with you, I've tried to plug a stock power cord to the MCC instead of my Master coupler today, the width/depth of the soundstage decreased, the pin-point focused vocal gone, I think the better PC plug to MCC, the better result you will get, I am using the MCC III for 1 Designer Ref Sq x-series power cord and 1 Designer Ref Sq (active but not X) AES/EBU digital cable, now I have a chance to buy either a Reference AC (not X), or a Master Coupler X-series, both are 2nd hand, first one is higher grade but old version, 2nd one is lower grade but latest version, which one will you suggest?

Mick I can't answer that question, sorry. The only way to know what will actually happen is to try it in your own rig. I can try to guess though...
It just might be a tie, so the best price might dictate the choice in that case. I am guessing an approximate tie because although the Reference AC was formerly a step up from Master Coupler, the Master Coupler you mention is upgraded to X series active shielding. Upgrade to X-series made a nice improvement on my DR2's, so assuming an equivelant enhancement (this assumption may or may not be correct) then the Master Coupler could be equivelant or perhaps even slightly better (or Not?).
This is all about synergy (how the individual parts react together as a whole) so as I said, the only way to really know for sure is to try it out for yourself. Even your personal listening preferences come into play here; the sound that I would prefer isn't necesarily the same as the sound that you would prefer.

Hi Bob,
Thank you for your suggestion, I tried both 2 cables in the 2nd hand shop today, they plugged them in a CD player for demo, I found the old Reference AC is better then the Master Coupler X, the Ref AC is more relax, focused & natural, I bring it home and listening now, very good, I think DR2 will even better a lot, but think of the cost effective, I am happy to use the Ref AC at this time.