You’re kidding, right?! So if you dropped say £3K on something then you would automatically hear a benefit - no matter what - even if it sounded worse? My God, how could you ever trust yourself to buy anything?
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Yes that’s certainly true.
Yes I agree.
Yes, and that, once upon a time was pretty much the only way. I’m thinking of way back now - 1970’s. These days much DIY experimentation is unnecessary since it’s all commercialised. There’s a pill for every ailment. Much easier to go out and buy that.
I don’t spend money on punts I can’t afford to lose.
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So this means that, unlike people who do, you are able to see things for how they really are?
So it really comes down to ‘if you are able to afford losing money then your audio judgement will not be impaired’. If, on the other hand, you cannot afford to lose the money, then you will be subject to a pschological effect that makes you incapable of perceiving anything other than a benefit from your purchase’.
Highly imaginative!
Evidence?
I have had mine for 3-4 weeks now and I am gradually seeing an increasing improvement in sound quality. I was disappointed at first but decided to stick with it and leave the system running non-stop. I am now very happy. I think @burg has been having a similar experience.
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Good to hear. Whilst it seems not everyone finds it so, most cite an improvement after a reasonable burn-in period.
I suspect the degree of any improvement depends on the quality of your mains supply. If your supply is noisy then the improvement is more significant than if your supply is relatively clean and quiet. Which begs the question, how do you know if your supply could be improved by adding the Puritan 156 (or similar). It seems a try before you buy is the best approach, but if a new one it needs to be run in before coming to a conclusion.
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Possibly, though if the ground and 0 volts are bonded, which does have advantages, I suspect based on my experiences, it’s not so much the live / neutral being noisy, but the earth on TNC-S type systems and for that you can convert your mains supply to TT if not already to really get the mains supply noise levels down. I have been told TT systems are preferred in some recording studios.
You can also ask a dealer to borrow one. The one I purchased mine from offered the use of their demo version first before buying.
I asked Puritan on this since I’m using it without ground.
“Very much the most noise exists on the two wires you do use Live and Neutral
The PSM156 deals with the differential noise which is different on each wire and common mode which is the same on each.
The effect for you will be equally a revelatory as for those using grounded outlets.”
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Are you saying you have a Naim system plugged in to electric outlets without ground?
Absolutely 
Have tried with ground from another room. Heard no difference. But it is still on my todo list.
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Holy moly! Prepare for the attack!
I do have a ground box! Preparing for another attach 
It’s mainly for safety but I have RCD in my house which covers my back if that would happen. A ground connection could reduce EMC to some point if that’s an issue but it sounds great without it. Promise 
Remembering setting up a Naim system for a Hifi show first without
Earthed outlets it sounded like there were no attack in the sound,then I found an earthed outlet to plug in the system ,then
it sounded like a real Naim system.
I can imagine some of the more esoteric tweaking retailers selling different grades of soil for this at ever increasing prices. 
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Just buy a new bag when it’s full.
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Go check out CAD ground control boxes and their reviews and what people think. It’s made in UK too. Sometimes things are not like you might think. I’ve tried many of them and still have them. I guess you never had? Some think a 5GBP wall socket is best class and some don’t. There’s place for both without harassing people making fun of them just because you don’t think they align with your philosophy of what is OK or not. Here´s a wild card. You might actually be wrong. I guess your nick speak for itself. Cheers.
There was considerably more detail on offer and in that respect the upgrade was of a similar level to an upgrade of a streamer, DAC, preamp or other key component. But more importantly, it all just sounded much more musical, and has encouraged me to spend more time listening. *Paul G, London, UK
hooked the GC1 Ground Control up to the Melco server via the ground post and WOW, did it smooth and clean the sound up. Just an amazing improvement in the overall quality of sound. I’m amazed by how the stereo sounds with the GC1…Simply fantastic!! *Frank Goldfarb – Owner of Cane Creek Audio, North Carolina, USA
just wanted to tell you about an interesting revelation I had during my last recording with Ilonka Kolthof on piccolo flute and Raloh van Raat on piano. I was really afraid of the piccolo, being such an extremely high-pitched instrument, getting super sharp and brittle, especially with my very broadband microphones. But it really wasn’t, which surprised me greatly. I then unplugged the CAD GC1 and oh my, what a difference! Of course, I had already experienced the difference the GC units can make, but I was floored by the sheer difference between having it plugged in vs not. It was incredible. My assistant engineer, who’s worked for Channel Classics and Pentatone Classics as well, said he never heard anything like it and also wants to purchase a unit. *Brendon Heinst – Recording & Mastering engineer
The GC1 Ground Control received the Recommended Product Award from Net Audio Magazine in Japan:
I connected the GC1 to a RCA coaxial digital input of my SACD player to see how it would work. The result was an outstanding change in sound quality, noise was reduced, more details were heard, especially in reproducing weak notes. I haven’t experienced such a significant noise reduction with any other audio accessory in the past.” *Net Audio Magazine, Japan (translated from Japanese)
Connected the GC1 to the SPDIF on my CD player, it’s so good it’s overwhelming! Totally transformed my system.” *Alester Kells, Designer at Quadraspire audio racks
The difference the Ground Controls make is so profound in my system – a system that already has a fully realized, dedicated AC supply and two parallel clean grounds – that they have become indispensable.” *HiFi+ Magazine
I’m loving it – tunes are so much easier to follow and bass is so much more detailed; timing is incredible. Everything hangs together in a much more coherent fashion; every aspect of the performance is improved. The system is starting to take on some of the dynamics of real music. Really shocking. In summary, all I can say is ‘wow’!!” *Evan S. – Massachusetts, USA
I have one GC1 for a test in our home, I must say it is like the Holy Grail for me! I have been looking for this solution for thirty years! And now I have found it! Remarkable, I nearly can’t believe it.” *Rickard S. – Stockholm, Sweden
I have wired up the GC3 Ground Control and all I can say is *Holy ***!” *Nick S. – Hong Kong
WOW the improvement was astonishing. If I had not heard it I would never have believed the improvement this little box can make” *Philip – United Kingdom
If I’m honest, I get slightly cold feet with stuff like this, as I’m not exactly wealthy and I start to try to justify spending ££££££ on a small black box? ( I’d never even try justifying it to my wife ! ) Then I listen to what it does and there’s just no getting away from it.” *Stuart – United Kingdom