I’m having an NPX 300 on demo, connected to the 332. It makes the sound a lot cleaner, a lot blacker background, better soundstage and more detailed but it also takes away quite some warmth and makes the music less emotional, more analytical. Perhaps more hifi, less musical? Without it the music seems more organic and easier to listen somehow. Have others experienced the same? The ATC’s are very revealing and can, in some mismatched combinations, tip over to the analytical, too direct side. Looking forward to hear what others experienced when adding the NPX.
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I don’t hear any of the downsides you are hearing in my system. My current system conveys emotion very well? I did run the 332 and 333 without the NPX and in both cases when I added the 332 all aspects of SQ improved to my ears. When I did only have one NPX though, I thought on balance the system sounded better on the 333, I know others thought best on the 332.
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No direct experience here with NPX300, I run 333/332 bare. However, what you describe sounds a lot like a piece of equipment that is very new and hasn’t settled in yet. Is it worth giving it all a bit more time to settle in?
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In my experience, the NPX 300 makes the 332 sound more emotional and holographic, grow in scale, and the whole system sounds more effortless, full, and fluid. It was so much of a change that I’d never run a 332 bare again. Adding it to the 332 was the day I was shown what an NC250 can actually do after using it for 1.5 years previous.
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When I added two NPX 300 units to my system I was amazed at what a difference the power supplies made to both my 332 and 333. I too also found my NC 250 was improved. My dealer felt the 350 amps were not necessary for my system. I also had insufficient rack space and outlets for the 350 amps. I am never let down by the NC 250. My husband often asks me to lower the volume.
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UPDATE:
It seems what I described has subsided. I think it might be because I had the rings closed too tightly (not sure if that’s possible). I disconnected it this morning and reconnected it when a friend came over. We didn’t hear anything of what I described earlier anymore.
We were actually both in awe of the upgrade it brings to the 332. We were a bit speechless after the first song. It was a bit of an emotional song and it kind of left us silent when it stopped 
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This is NOT a small upgrade… it is almost transformational I would say.
My system now sounds like hifi systems you hear on hifi shows that are many times the price. So effortless and it improved literally every aspect of the sq.
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Naim power supplies provide a cleaner power supply and the sound will therefore sound more accurate. Less distortion, better and clearer bass, mids and treble. Will remove fuzziness and so called ‘warmth’.
If you don’t want those attributes then go bare units. Nothimg wrong with that.
I have full 500DR system and there is no option to go for power supplies. They are included with preamp amd power amp. And ND555 won’t work without them.
If I had 300 series kit or 200 series I would go NPX300 on each component. You will get the best of your system that way. Buy used and save funds.
Of course if you are happy without NPX300 then do that.
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I agree the NC250 really benefits from the 332/300, 333/300 and the NVC TT/NPX TT. The 250 has plenty of power for me, as I don’t play music at studio levels because it triggers my tinnitus.
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@paulbysea I agree. I would love to do a power supply for my NVCTT, but I have no rack space or outlets remaining.
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I’m not finding that at all. Probably needs to thoroughly settle down. Nine months and I’m finding subtle improvements to the sound but all of it musical. In fact after 40 years in hifi I’m gobsmacked at what this Naim combo is capable of achieving. Have faith.
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@pslosarc It took quite a while for ne as well.
That’s the exact term my Naim dealer used to describe the impact of a 300 on a NSS 333. He was right. Enjoy your upgraded system!
Claude
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Has anyone with an NVC-tt hooked up to a 332/300 added the NPX later? I would love for someone to describe the difference.
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Perhaps you missed the “update” post 
Fully agree now hehe.
I have the NPX and would describe it as a very worthwhile upgrade, more clarity, scale, and realism wrt instruments and vocals.
I am listening Clapton’s unplugged album and I can NOT believe how good the system sounds. The NPX300 is really an INSANELY big improvement. Everything sounds so much more real. I think this piece really brings a lot of improvement if the rest of the chain is up for it.
This sort of upgrades really amaze me at how much more the SCM40A’s can keep giving. My 40’s sound better now than most 50’s I have heard. Of course my full chain has been fine tuned to my liking so that I different tha when you hear 50’s at shows. Upgraded XLR’s between 332 and 333 and to the ATC’s, Plixir power supply with Furutech DPS cable and upgraded power cables to the Naim equipment and to the ATC’s. Also my room is partly acoustically treated.
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The difference is not night and day then. More night and volcanic eruption.
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Maybe it’s the speaker pairing or power amp? I have 332/300/350’s via Sonus Faber ON5’s and just can’t get enough listening hours in
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It already solved itself. See the post with UPDATE above . 
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Sorry missed it…great that you’re enjoying