Shunyata or Synergistic for power conditioning?

lak is correct. That's the only way to do it. If you live in the US, call The Cable Company. They can send you demo's of both units. 

Sorry I cannot comment on the comparison but I own the 12UEF and could not be more pleased. However the Denali is also a very well reviewed unit and one I would be happy to own. Based solely on ease of use and my beliefs on synergy my advice would be that if you already have a lot of SR kit then go with the 12UEF but otherwise choose the Denali, if only for the plug supports which are a godsend, and something I have to improvise on my 12 UEF. One material consideration is that the Denalis do not come with a power cord, that actually makes them much more expensive if you do not have a spare suitable cord (in the $2-3K range) handy. Hope this helps. You can find my experience with the 12UEF here

Thank you guys!
The problem is that both products are sold by different retailers and both do not have the products for home trial.

That aside, I appreciate the kind advice from folkfreak from a "holistic" angle of owning a particular product. I own neither SR nor Shunyata products currently. I think SR has more products in their arsenal (Tranquility, grounding, etc)...

My cables are all HiDiamond.  Will the HD3 power cord from wall to Denali work well, I wonder. 

@hamburger;
I recently purchased the Shunyata Denali D2000T.
The HD3 power cord (I use to own a D3 and D4) will work on the Denali but you will need a 20 amp IEC feeding the Denali. If you don't own a 20 amp IEC power cord you could buy an adapter 15 to 20 amp IEC from VooDoo Cable for example: https://www.audiogon.com/listings/ac-cables-voodoo-cable-iec-adapters-15-amp-or-20-amp-cryo-treated-...
They do work very well and I have never experienced any loss of sound quality.
I found a gem in the rough that I'm currently using to power my Denali, it's the Silver Ghost power cord: https://www.audiogon.com/listings/ac-cables-6-silver-ghost-custom-made-silver-rhodium-woven-power-co...
I had a custom Silver Ghost made with 20 amp Wattgate IEC's. It's a very good power cord that is relatively inexpensive, but competes with power cords easily costing thousands of dollars in my opinion, and I have owned those power cords. BTW the Ghost power cords are built with impeccable craftsmanship, I'm very impressed and just ordered a second one last night. Being cryogenlitcy treated, they do take some break in hours.
I'm in no way connected to or benifit from any of the manufactures mentioned above, I'm just trying to pass on my thoughts to anyone that reads this.
Happy New Years to all!

"Based solely on ease of use and my beliefs on synergy my advice would be that if you already have a lot of SR kit then go with the 12UEF..."

folkfreak,

I find this to be so true with the SR products. Perhaps this, aside from the obvious value offered, is why SR includes their power cord and receptacle with each Powercell 12.

hamburger,

If you are open to other considerations, the Audioquest Niagara 7000 and the Running Springs Audio Dmitri have been recommended by several credible audiophiles here and elsewhere.

Best to you both,
Dave