Is DR part of all Naim products with power supplies introduced after 2012

If you look at the internals of say an NDX2 you can see that the PSU section is quite basic - various transformer taps go through rectification and smoothing. No fancy DR regulator boards.

Many devices do include additional further regulation across various boards, or for powered DIN etc,

This is the naim way - you add an external PSU to increase the quality of the power rails and hence SQ.

The XPSDR has fewer DR regulators than the 555PSDR which was one reason for the cost difference (let’s not start discussing VFM again).

The new 300NPX uses DR regulators, obviously.

DR regulators can be found in the NAP250DR, NAP300DR, NAP500DR, XPSDR, PS555DR, 200DR (DR power for attached preamp, not the power amp itself), Supernaits 2 and 3 (DR for preamp only), Hicap DR, Supercap DR.

Nigel interesting from what I see doesn’t apply to the New Classics?

Does it? Doesn’t say that on the website, as far as I can see?

I was only covering the non-NC stuff.

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Here’s 110db on the topic

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Look at the internals.

NPX300 has a number of DR regulators.

Thanks guys, get it now.

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I was only looking around the forum to try and find a post from 110db about the regulation in the bare NAC332, as I wasn’t sure if that was DR vs some other regulator scheme, can’t find the post I thought I recalled so far!

…here’s a post from Richard on the topic

Edit 2, and one from Steve Harris

The NPX300 has eight DR regulators, and they are also in the new 250 and 350. I’m not sure about the 222, 333 and 332 though; I presume not.

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The same principles apply to NC.

Look at the internal PSU of the 222…does it look very similar to the PCB in an ND5XS2, for instance?

Add the 300NPX to get fully regulated DR rails.

Of course there are other improved approaches within NC, before anyone says.

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Naim website says that the 222 has DR

Here are some internal photos of the NC 300 series by @110dB:

Only “Linear PSU regulators” are mentioned in NAC 332 and NSS 333, in contrast to NAP 350 which explicitly states “DR PSU”.

No…

…to this day however.

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With all due respect to Dr , it’s no longer new and probably just seen as a std part now in new Naim , no need to advertise ,it is after all over 10 year old development

Fair point. By now, naim should be fitting it as standard.

Yes.

Rather like my car model name doesn’t include a little i at the end, even though it has fuel injection

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The answers are on the forum.

The NSS222, 332 and 333 have a “linear PSU regulation” board, under other boards so not immediately visible on photos.

As naim explain on linked posts this regulation is not DR, it’s previously used (but reliable/tuned/understood) tech.

Whether the 222 has a single DR regulator for pre amp only, like the SN3 does, I don’t know.

But to get DR regulation on all power rails on NC devices you need the NPX300.

From a marketing perspective this makes sense. If the 333 (for example) had 8 internal DR regulator boards there would be no point/uplift in adding a 300 NPX!

Looking at a picture of my Supercap Dr, the part that does the NAPSC equivalent
has DR regulation.

That’s correct, the SuperCap DR outputs 2x12V DR on the digital interconnect.

I wouldn’t say it was quite as simple as that. It’s a bit like saying you don’t need a Hicap if you’ve got a 200DR because the preamp power supply in the 200 then provides DR power. Putting the power supply in its own box gives it physical isolation from sensitive electronics, and allows it to be substantially beefed up given all that extra space available.