The key word for the GPZ is leverage. Improvement across the board, not limited to one device as with a SPC Sakra V17. It’s a no brainer in my world. My guess it would make a Super Tramp Crime of the Century CD played on a PST through a Holo May DAC sound exceptional. 
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I know why reviewers don’t review Stealth Sakra V17’s and PowerZone’s because its to painful to give up when the review is over!
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Doing a little research and found this on an Audio Vision of San Francisco website:
Specifically:
Features & SPECIFICATIONS
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HAFNERTECH™ by Paul Hafner
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SmartStack™ by Meneta Group
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PowerZone 3.10 UK
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Powerzone 3.20 UK
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Powerzone 3.10 US
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Powerzone 3.20 US
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Powerzone 3.10 EU
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Powerzone 3.20 EU
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Designed and built in Denmark
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PowerZone 3.10 has 1x8 high quality Furutech outlets
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PowerZone 3.20 has 2x4 high quality Furutech outlets
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PowerZone 3.10 is equipped with 1 HAFNERTECH™ module
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PowerZone 3.20 is equipped with 2 HAFNERTECH™ modules
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PowerZone 3.10 is rated for 20 amp, and can handle a full system including Apex Stereo
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PowerZone 3.20 is rated for 40 amp, and can handle a full system including Apex Mono
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EU CE Approved
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PowerZone 3.10:
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Dimensions (WxHxD) : 486 x 125 x 285 mm
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Net. Weight 10.9 kg
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Shipping dim.: 61 x 39 x 28 cm
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Shipping weight: 19.5 kg
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PowerZone 3.20
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Dimensions (WxHxD) : 486 x 125 x 285 mm
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Net. Weight 11.9 kg
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Shipping dim.: 61 x 39 x 28 cm
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Shipping weight: 20,6 kg
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This demo is good for Donald!
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Thanks! I got all the information that I need from you and Al already😆 No demo for me in a foreign setup and room.
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I should add one thing, the specs for the PZ do not indicate its operating voltage. For the US typical mains nominal operating voltage is 120VAC, for the EU/UK it is 230VAC. Thus current demand for an EU specified amp will be half of a US specified amp. This is regardless of the dual C19 power provision.
In a nutshell, a US spec’ed PZ3.10 is power limited at 2,400 watts nominal. An EU/UK unit is good for 4,600 watts.
The Stereo APEX is rated at max 3,700 watts, so I’d follow Al’s lead and do a PZ 3.20 in the US. In the EU one could get by with a PZ 3.10.
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My Audio Guru George from Kyomi Audio got back in the USA today. I imagine he will need some time to adjust. But I sent him a text asking about a group buy.
Everyday you spend without one of these is a Sin against you and all of your wonderful Gear.
Seriously. This is the high speed train to the really, really, really good stuff. Stupidly expensive, but easily worth much more.
*and thanks to Paul we now know it works with way more affordable gear.
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If your “group” has room for one more, I’m interested.
The group has not formed yet, the more the merrier.
I received a positive response from George.
A potential group buy group is formed. If you are curious drop me a note.
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You’d have to get an Apex also. But Al is ready for his second Apex sometime down the road. After the the second Apex and Siren he would need an addition 3.10 for his source gear. #infiniterabbithole
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My way more affordable gear and the PowerZone. 
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Thanks for putting me in the PZPG (PowerZone Purchase Group). Zonies unite!
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Weedee, my BHK 600’s show max power consumption at 1500 watts each at 4 ohms. Double would be 3000 watts and exceed the 3.10’s capability if I have this correct.
This may only be an extreme situation as the P20 is at 65% capacity with theses amps and other source gear, with a 20a service and cord.
I hope not to be concerned with a 3.10 purchase as it might only rarely be at limit. Or, I’m simply wrong about this, wouldn’t be the first time.
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If Rune says it will power a stereo Apex I’m confident the pair of BHK 600’s will not be and issue plus you aren’t cranking up Tool to max volumes. Plus the other components Grimm MU2 and Jays Transport is not drawing a ton of power.
If you get the 3.20 no worries for anyone.
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Understood, IF you are in the EU, you are covered, but in the US you have less juice, if I understand this correctly. I also understand that even with more limited power in the US, I may never be at this extreme.
I always thought that EU/US power was a phase conversion and not a power difference.
Someone here please set this straight 
.
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Thanks for pinging George. Hopefully he is in the area for a while, 
Makes sense, and that Gryphon Siren is beyond, beyond…
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If you plan is to keep the BHK 600 long term, I would not hesitate to get the PZ 3.20. Especially if you currently have multiple 20 amp home run drops in your listening room.
I’d hate to learn that your Jay’s CDT is stalling on fortissimos.
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Siren is the essential Phono Stage. At least that’s what they say. Lol
Al and I had the discussion that the Commander has this large power supply with extra power ports for future Gryphon products like the Siren, but no they give the Siren its own power supply in a separate chassis identical to the Commander! It’s a head scratcher.
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EU/UK 50 hz, US 60 hz. No phase differential, which is a timing thing basically. The higher voltage provides for lower current (juice) delivery to meet a specific power output. The advantages of 230VAC over 120VAC are less current driven power loss (IsquaredR). My guess is the limiting factor for the PZ is the 12AWG wire rated for 20 amps at 250 volts.
My guess is the Hafner modules are a resonce devie that actually do not pass current being non-conductive. Emphasis on guess.
For Apex and BHK 600 level, 230VAC EU spec’d would be my choice. The advantage of the PZ 3.20 is it leave no room for second guessing.
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