SHUNYATA RESEARCH VRS CARDAS AUDIO VRS SYNERGISTIC RESEARCH

Hello @swede58 and @vx700 ,   greetings from Maryland!

Here are my recent experiences with 2 Shunyata Power cords.  I wanted to get a power conditioner / surge protection unit due to frequent thunder storms.  I had read good things and purchased a Shunyata Denali 6000s V2, along with a Sigma V2 XC 20 amp power cord.  I tried this combo in one of my systems, my family room with at that time Revel Salon 2 speakers.  I ran my Makua preamp / Tambaqui DAC and my streamer through he Denali.  I always kept my Audionet Max amps plugged directly into a dedicated 20amp outlet.  Wow my wife and I thought.  It seemed to really 'light up' this system.  Maybe blacker background, but certainly highlighted the upper end.  We liked it.  Note the Salon speakers have a relaxed top end.  But, as extended listen sessions followed, I began to get ear sensitive and developed listening fatigue.  So I swapped in a 20 amp Kubala Sosna Elation power cord, and the sound smoothed out.  The Denali still cleared things up, but the synergy of the Elation power cable with my all Elation system seemed to win (again) for me.  Well fast forward, the rubber feet on the Denali stained my Tiger Maple audio shelf, and the nice folks at Shunyata gave me a 20% coupon for my troubles.  So not to be deterred, I purchased a Shunyata Sigma X NR 20 amp power cord to try in the Denali.  I liked it better, and kept it in the system for a couple of months.  But I could not stop  the feeling that the highs were just too bright.  So again, I swapped the Elation 20 amp PC back into the Denali and again things smoothed out to my liking.

Venturing into the not what the OP asked, I am now in the process of upgrading my better system to K-S Ovation, and my family room system to Realization.  Each is easily incrementally better, but always in keeping with the Kubala Sosna house sound of full spectrum, resolving, but never fatiguing.

I am sure the decision on these items is very system dependent.  For example, the Denali in my better system, which is more resolving, was not beneficial no matter what power cord.  I think a system with, strictly for example, McIntosh tube gear might appreciate this brighter sound where a solid state system like mine may be more sensitive to it.  Similarly, my systems stay away from silver in wires and appreciate an all copper cable loom.

My experience with your selections are limited to SR fuses and a USB cable based on suggestions here on AG. The fuses were a waste of money and the USB cable sounded no different than the $5 USB cable that came with my DAC, so it went back (fuses were not returnable). For digital I went with DH Labs Ethernet and USB which I thought sounded better and were very reasonably priced, and from what I can tell is a very well respected Company.

I am sure you don't want to hear (read) this so here is your chance to bail:)

There are few cable companies that spew marketing BS as much as (as well as?) SR. There is no such thing as quantum tunneling in metallurgy. In their digital section they brag about 99.9999% pure silver but in the specs they only list 99.999%. An innocent typo? Maybe. But when words like "Tesla Coil", "Quantum Tunneling Ground Lifters" etc. are thrown around you need to get "5 Nines" vs. "6 Nines" correct. 

There are plenty of cable companies that make excellent products at fair prices, with those that are direct to consumer generally representing the best value for money ratio (usually double in terms of cost of manufacturing vs. MSRP), that do not make up doo doo to sell their goods.

My system is listed in detail in my virtual system (current pics coming soon as I just changed out speakers and rearranged the room).

@fastfreight I expect the Shunyatas sound good in the OP's system because he has a full MacDaddy setup. 

I had Andra III 's for over 15 years and they cannot hold a candle to ATC. Power handling on the ATCs is superb , easily handles 1000w, whereas I wouldn't push the Eggs beyond 300w.

There's a good  YT video on the Andra's by GR Research.

The first thing I’ll say is in 2019 I upgrade drivers, internal wiring, and crossovers to Egglestone newest at that time, and painted the cabinets in Bentley  Black Matelic. 

they sound far better than early Andra III an leaps above IIs

as for SR, not my cup of tea at all, a friend told me exactly the same thing that steakster said about SR

me I have used Shunyata for quite sometime now and I did notice recently they seam a little bright in the high end, started wondering if it was the ATC CD player I had caused it, I just sold it and yes sir it was the ATC CD player. I never liked it! 
I am leaning towards Cardas at moment. Thinking buy a few or of used and see what they do. 
Any other suggestions? 

@fastfreight I haven’t tried any PCs from Shunyata but my impressions of the Alpha v2 xlr mirror yours, very detailed but a bit thin, bright and analytical sounding. I was hoping the new X cables would have a fuller sound.