2x555DR vs. 1x555DR on a ND555

Because it gets the 552PS away from the 500PS. My hunch is that the impact of the latter on the digital 555PS will have less impact on overall sound quality.

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I think Mmky is already proposing having the 552 on top of the brain stack

@Michaelb ahh ok! I misunderstood!

Seeing as you actually have a CHC DC3 and were the one who advised this as a potential option to me, where would you place it in the stack? Second shelf between 500 on the base and 555D on the third or very bottom is what I was thinking but I am not as familiar with the unit as you. I suspect it has a smaller transformer than the 5xx power supplies but again could be wrong! I have medium spacing which does help a bit. I plan to have the DC3 on the right of the shelf with the EtherRegen to the left of it.

Hi Darke … I have been following your journey and really appreciate your findings and views … I think I will eventually end up with a second 555ps…doh. One area I can recommend is replacing the powerlines…yes sacrilege!!! I tried the Russ Andrews Evo500… they are fantastic…this was like box upgrade…more of everything…

Or Chord sarum t on 555 dr. Great!

Makes sense. Worth a punt.
The analog 555 is the one that’s connected to the burndy closest to the din interconnect, right?

Yes, that’s the one!

I have my DC3 and EtherRegens around 5m away from the rack. That’s partly historical (the Cisco worked much better like this). Your positioning sounds good if it allows all the cables to hang free and for the Ethernet cable to keep away from power… But don’t be afraid to experiment. You’re correct on the transformer sizes.

PS: Actually, thinking about this further, I’d try putting it on the top shelf, so the ER only has one big PSU to contend with

Tell us more FR.

The tonality and sound signature I had remains the same. So it’s not dissimilar to my Kharma cable I had previously. The powerline sounded a bit lean , not organic to my tastes.
With the Sarum t, which apparently needs maybe 400/500 hours to be fully run in, I have for now ( 40 hours) a more dynamic sound, more open, with better defined instruments.
I will say more in 10 days, when the burn in will be more done.

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fr…imagine what will Chord music do to your source

If only I could afford…but yes, I imagine. :innocent:

So - what do you prefer? The Rega TT or the NDS. And which needs more tweaking?

Imagine can be true latter … now you think as John Lennon thought long time ago

There is still something more real with the turntable.

Hi Bart
dCS Rossini is $23,999 and Rossini Master Clock is $7499 = $30,998
(Master Clock should be mandatory according to most)

$29,000 is for the Player version with CD drive as Dan just bought.

Best
Gregg (one of the two US dCS owners you know :laughing:)

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This will help.

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Typo - exactly as I said before - except change to:

2. place the ‘analog’ PS on the lowest shelf (viewed front of PS - LH rear ‘Burndy 2’ to LH ND555).

What I described before is exactly what I did and found - I just confounded the attribution of the Analog and Digital Burndies.

Picture above helped. I recall before that I thought the ‘analog’ PS would sound better up from the lower base-level - but in my system it really did not. Hence the sequence I recommended when asked was what I use found on experiment.

The D to A conversion area where the little square blocks are shown on the middle RH PCB are where the transition from the ‘digital’ world to ‘analogue’ signal is made.

It is a very sensitive place to noise intrusion and has to both have an ‘digital’ and ‘analogue’ side to the chip - looking at the wiring it may be that it actually uses one of the ‘digital’ lines for the D to A chips.

The following circuits (lower RH and the full LH PCB) are then all various filtering circuits to remove digital noise artifacts and produce the finished analogue signal - these are all fed from the ‘analogue’ supply.

From previous work I have done myself with D to A conversion this is the point where you join the digital and analogue 0v lines that then find their way to respective their PS; you then can ‘group’ the circuits that feed the individual stage supplies to keep the current loops separate and lower noise entry from cross-talk in the supply circuits and associated wiring.

In any case - Naim do all that job to sound the best in the end result - and then you have the option when arraying two PSU - if you power it that way - such that you get the best results. The only way is to try both options of stacking and choose which you prefer.

DB.

Well i picked up my second 555 ps yesterday and installed per DB’s comments. I played it last night and today and it has made this nd555 sound just wonderful. It has improved the detail, clarity, dynamics and is giving much better bass control, which i was not expecting. The new Bob Dylan album has a track titled “Murder most foul” which is 17 minutes or so long. To underscore some of the lyrics, the bass goes very deep at times, which i enjoyed before. The second 555ps has surprised me how it has tightened up the bass on this track. Listening to Santana, Caravanserai…i would liken it to having wiped a little mist from a window you can see more, or in this case hear more of the recording.
Very pleased.

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Yes - the Bass weight and authority were the immediate obvious things that struck me. It allowed the bass rage instruments to do their thing with more easy musical freedom - and allowed the rest of the frequency range above to come alive more is how I first heard it on demo.

Once you settle-in over time with it you will find it is a lot more than that though - that is just the first impression. :bear: :wink:

DB.

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