2x555DR vs. 1x555DR on a ND555

I wish😬

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FWIW I installed new PS555DR on the upper shelf feeding the digital socket on the ND555. The power supply used for analogue is on the shelf immediately below the digital supply. It took a while to settle in.

Next time I break it down for any reason, I’ll try one of the other possible permutations to see if I notice a difference.

@Darkebear interesting re the 555PS D on the base shelf. I have 4 P/S on one fraim currently and am about to strip down. So would love your advice. I have all Medium shelves. Thinking about the following now…

Top level 552 P/S
Then 555 P/S A
Then 500 P/S
Then 555 P/S D
Base CHC DS3 half width P/S

The format above is based on your earlier comment about the 555 D being best at the bottom. Would you move the CHC DS3 up one and still place the Digital P/S on the very bottom?

The ND555 and 2x 555PS = $44,000 here in the States. I’m trying to figure out the “up to twice the price” option(s) in the market they say it compares well with. There must be something at that price; I’m unaware. dCS Rossini is $29,000; not close.

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Anyone willing to invest in a ND555 and 2 x 555drps, should really also try the competition, as you would be very silly not too

Agreed! I’m just trying to figure out what that is in the price range the reviewer mentioned. It’s not dCS or Nagra, but there must be more esoteric brands I’ve never heard of??

There are a few and it all depends which you prefer, most have been talked about on this site.
I went down the rossini/clock road

I know 2 recent Rossini converts here in the States. Hope to do some travel at some point and hear them in a Naim system. (Actually one has it paired to an Aavik.)

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Correction: I’ve just peered down behind the rack and found that I have the analogue power supply above the digital, but the analogue is supplied by the newer supply. I will try it in one of the other permutations when I’m down at the level of those PSs next.

DCS and MSB would probably be the best known Bart.

Best regards, BF

Lumin X1 too. Some prefer it to the Rossini/ clock at more than twice the price .
My dealer have only the entry level Lumin, but not the S1 or X1. I wonder how they sound.

Things to consider:
1. The 500PS is by far the Noisiest supply - I would not nest it in-between the two source supplies!
2. Medium Levels are Great! They help a lot.
3. The 555 ‘digital’ supply in-part also feeds the DAC circuits in the DtoA process and is in some respects also a ‘source’ in part, so it is not an entirely clean decision. The two 555 supplies will sound different - I swapped each and one config had better timing and was ‘faster’ with less heavy ponderous effect, so I chose the ‘faster’ better timing option; but you too can try and verify for you - very easy.

…so I’d put 500PS lowest of you shown option - just shuffle it down to bottom. 500PS also sounds good on a Base Level - I found the 500 Head unit does not and likes to have an empty Base level under it on a Standard Level, or higher-up in the Fraim.

Worth getting it right as at this price point it really matters - in fact it always matters but the more you have spent the more you should work to get the most out. Only time to try it. :bear:

DB.

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Thanks @Darkebear! Exceptional advice as always! I always find your starting points make a difference so its really useful to tap into your vast knowledge.

I assume the 552 P/S is best placed at the very top, is that a good assumption? I have always had the 555A on top but will be switching the 552 Head up one level to the top when the ND555 arrives. Cable dressing would work in any position.

Any thoughts on the CHC DC3 P/S? It could go anywhere really. Never considered putting it at the very top but maybe the half width box may keep the 552 Head further away from a P/S…

Apologies for all the questions!

FWIW this is what I have now:

Nac552 Analog 555
ND555 Digital 555
Space Nac552 PSU
Nap500. Nap500PSU

Standard shelves everywhere except the bottom ones that are medium.
@Darkebear

If you can be bothered, try swapping the 552PS and digital 555PS…

It can work well in many places - sounds different top and bottom - I prefer overall top, but bottom has a certain stability - top more open. These were before I went to dark side with S1 Pre. :bear:

I always experiment - I learn from having a great idea and spending many hours pulling Fraim apart to do it - it all looks great - and sounds awful! Then I ponder - what has happened? I learn from getting it very wrong, but I also know it can be go very wrong.

Anyone Active with SNAXO powered by Supercap (SC) - the PS needs its own space away from other supplies! I thought my system had developed a fault - it sounded so harsh - but put it all back to where it looked bad but the SC was top shelf away from power Amp supplies - and it was so much better it was silly.

The 552PS is similar - it likes not to be ‘nested’ so have it top or bottom and decide which you prefer - or have plenty of space around it may also allow it to not get a bad interaction with the other PS fields.

DB.

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In my system, If I put the 552 PS up top, the cables won’t get to the 500 anymore.

I personally would not go for two supplies with a 555 because I am not sure about the differences in performance, and the expenditure does not seem to justify it, but there are some people like this configuration.

@Michaelb - just curious - why do you think it would make things better? Just trying to understand your POV.

@MMky both Michael and DB have suggested the 552 on top being an option. DB explains a couple of posts above the difference he heard in his system between bottom and top positions. He found both to work well but they gave a difference in sound. DB was answering my questions and I use Medium uprights on my fraim, if you use std maybe the top is the best for the 552 so it does not have anything above it…