# 2x555DR vs. 1x555DR on a ND555 **URL:** \ **Category:** Streaming Audio\ **Created:** [October 9, 2019, 12:33am UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450 "2019-10-09T00:33:09Z")\ **Posts on this page:** 20\ **Page:** 25
**Author:** ![GraemeH](https://community.naimaudio.com/user_avatar/community.naimaudio.com/graemeh/32/337_2.png) [@GraemeH](https://community.naimaudio.com/u/GraemeH)\ **Post date:** [October 30, 2020, 12:41pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/487 "2020-10-30T12:41:27Z")
Anacablethatcantbediscussedhere G ---
**Author:** ![Darkebear](https://community.naimaudio.com/user_avatar/community.naimaudio.com/darkebear/32/262_2.png) [@Darkebear](https://community.naimaudio.com/u/Darkebear)\ **Post date:** [October 30, 2020, 1:29pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/488 "2020-10-30T13:29:27Z")
> [@Richieroo](#): > > …the balance of my system seems to have shifted there seems to be more mid bass and the hi frequencies are slightly more recessed…I know this is a beast of a power supply and takes some time to settle … Do give it about 6 to 8 weeks before tweaking elsewhere to get tonal balance optimal, for now is my advice. The DR supplies I find start from new with Bass-end very good and almost ‘done’ run-in but the top-end goes low-detail and can sound shut-in for a bit until run-in and that makes the whole sound bass-heavy with detail rendered - the ‘subjective’ frequency response and not any actual one measured with sine waves and the like. Once the DR supply HF caps run-in then it opens-out nicely and it should then be fine. The non-DR supply runs-in ‘opposite’, in that the bass takes time to fill-out and lags the rest. The DR very low bass also fills-out later and the end result is a seamless presentation when the DR supply is offering a more linear impedance to the supplied load (ND555) and it all just runs nicer to listen to after a few weeks from new. Just how I hear it and not meant to be other than one experience of these things. 🐻 DB. ---
**Author:** ![Richieroo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/richieroo/32/40009_2.png) [@Richieroo](https://community.naimaudio.com/u/Richieroo)\ **Post date:** [October 30, 2020, 2:56pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/489 "2020-10-30T14:56:54Z")
😉 😃 🤓 ---
**Author:** ![MrUnderhill](https://community.naimaudio.com/user_avatar/community.naimaudio.com/mrunderhill/32/7462_2.png) [@MrUnderhill](https://community.naimaudio.com/u/MrUnderhill)\ **Post date:** [October 30, 2020, 3:54pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/490 "2020-10-30T15:54:29Z")
…you mean ‘futile’ surely? ---
**Author:** ![Richieroo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/richieroo/32/40009_2.png) [@Richieroo](https://community.naimaudio.com/u/Richieroo)\ **Post date:** [October 30, 2020, 4:44pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/491 "2020-10-30T16:44:43Z")
That as well!!!.. ha ha 😂 ---
**Author:** ![Robbo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/robbo/32/141550_2.png) [@Robbo](https://community.naimaudio.com/u/Robbo)\ **Post date:** [October 30, 2020, 5:52pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/492 "2020-10-30T17:52:21Z")
> [@Richieroo](#): > > So in the last few days…the balance of my system seems to have shifted there seems to be more mid bass and the hi frequencies are slightly more recessed. The sound is still very good but ‘darker’ if that makes sense I am in exactly the same place. The sound is a bit « round »… as if the top end now needs to extend a bit to catch up with the extra bass and mid. As I’ve said before, I had a very extended trial of a well run in PS, and with that the whole presentation improved top to bottom, so just a waiting game to get there I guess 🙂 ---
**Author:** ![Richieroo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/richieroo/32/40009_2.png) [@Richieroo](https://community.naimaudio.com/u/Richieroo)\ **Post date:** [October 30, 2020, 7:04pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/493 "2020-10-30T19:04:05Z")
Good to have your feedback…yeah I expected the run in to be protracted…but I did wonder if the digital side would be so sensitive…the answer is obviously yes it is…just hunkering in for the long haul now… ---
**Author:** ![Done](https://community.naimaudio.com/user_avatar/community.naimaudio.com/done/32/105708_2.png) [@Done](https://community.naimaudio.com/u/Done)\ **Post date:** [November 2, 2020, 6:27pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/494 "2020-11-02T18:27:34Z")
I noticed exactly the same with my CD555. I bought a second 555PS to partner my NDX2, but tried it on the CD555 as an experiment. It hasn’t gone back on the NDX2 ---
**Author:** ![Richieroo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/richieroo/32/40009_2.png) [@Richieroo](https://community.naimaudio.com/u/Richieroo)\ **Post date:** [November 2, 2020, 10:49pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/495 "2020-11-02T22:49:42Z")
Hi all good news … bizarrely things are beggining to snap in space … the sense of space and air…is getting better and better…the speed of percussion has also increased leading edges are very very good. On the other hand I am getting a sense of relaxation to the presentation… especially to complex music passages…which are really opening up… Bass is tighter and deeper…all good now let’s hope it continues… ---
**Author:** ![Robbo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/robbo/32/141550_2.png) [@Robbo](https://community.naimaudio.com/u/Robbo)\ **Post date:** [November 3, 2020, 7:22am UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/496 "2020-11-03T07:22:07Z")
Similar experience here - all started to snap into place on Saturday evening, which is a week into burn in. Now sounding very balanced, bass lines are laid bare, beautiful mid and a sweeter, more open top end. All good 🙂 ---
**Author:** ![Richieroo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/richieroo/32/40009_2.png) [@Richieroo](https://community.naimaudio.com/u/Richieroo)\ **Post date:** [November 3, 2020, 8:35am UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/497 "2020-11-03T08:35:33Z")
On this journey a couple of things have really surprised me… 1. The ND555 sounds really great with one psu … and you think how could it be any better…as nothing is apparently wrong…but the second supply really does for me have quiet a profound effect. The same happened with the 272 … adding the 555ps was phenomenal…yet it did not sound broken before… amazing. 2. Just how good the 552 preamp amp is … it is very fast and very transparent for an old timer… 3. These little PMC speakers are just incredible … these little chaps are so transparent, clear, focused, snappy and yes they are digging out some amazing bass…perfect for a small room. I will also add they are in no way embarrassed or exposed by the front end … they are a brilliant design. ---
**Author:** ![Robbo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/robbo/32/141550_2.png) [@Robbo](https://community.naimaudio.com/u/Robbo)\ **Post date:** [November 4, 2020, 10:17am UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/498 "2020-11-04T10:17:30Z")
And it just keeps getting better! Separation of instruments is just on another level. I am hearing stuff that was always there, but just sort of blended into the mix. Now every instrument exists in its own space, if that makes sense. I am wondering how it can get better, but apparently the journey will continue for a few weeks yet 🙂 ---
**Author:** ![Richieroo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/richieroo/32/40009_2.png) [@Richieroo](https://community.naimaudio.com/u/Richieroo)\ **Post date:** [November 4, 2020, 10:19am UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/499 "2020-11-04T10:19:20Z")
Very well put Robbo … here here … 👍 I think the ND555 is phenomenal and really it does deserve the two supplies … I am listening to all sorts… particularly enjoying ECM albums…I have a couple of tracks I occasionally reality check with … as I am used to sonic landscape. All I can say is wow I am hearing elements in these tracks that were not there before … in a way the system is seeming to behave like its being supplied by a phenomenal analogue - source… if that makes sense… ---
**Author:** ![Richieroo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/richieroo/32/40009_2.png) [@Richieroo](https://community.naimaudio.com/u/Richieroo)\ **Post date:** [November 4, 2020, 10:41am UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/500 "2020-11-04T10:41:36Z")
Just listening to the MQA test on Roon Live Radio … wow that sounds terrific… give it a try… ---
**Author:** ![emrei](https://community.naimaudio.com/user_avatar/community.naimaudio.com/emrei/32/9009_2.png) [@emrei](https://community.naimaudio.com/u/emrei)\ **Post date:** [November 4, 2020, 12:09pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/501 "2020-11-04T12:09:00Z")
Have you read the review ? İt is little like a Commercial:) ---
**Author:** ![Meni](https://community.naimaudio.com/user_avatar/community.naimaudio.com/meni/32/410738_2.png) [@Meni](https://community.naimaudio.com/u/Meni)\ **Post date:** [November 4, 2020, 12:36pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/502 "2020-11-04T12:36:44Z")
A third 555ps will bring musician home 😀 😀 ---
**Author:** ![Richieroo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/richieroo/32/40009_2.png) [@Richieroo](https://community.naimaudio.com/u/Richieroo)\ **Post date:** [November 4, 2020, 1:55pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/503 "2020-11-04T13:55:04Z")
🤣 😂 ---
**Author:** ![BertBird](https://community.naimaudio.com/user_avatar/community.naimaudio.com/bertbird/32/881_2.png) [@BertBird](https://community.naimaudio.com/u/BertBird)\ **Post date:** [November 4, 2020, 2:50pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/504 "2020-11-04T14:50:33Z")
I expect a 888ps… 🙂 ---
**Author:** ![Richieroo](https://community.naimaudio.com/user_avatar/community.naimaudio.com/richieroo/32/40009_2.png) [@Richieroo](https://community.naimaudio.com/u/Richieroo)\ **Post date:** [November 4, 2020, 3:19pm UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/505 "2020-11-04T15:19:56Z")
I had a thought last night … what if you had one big box … say the size of a Krell KSA and then had every single supply cable with its own dedicated DR psu and individual transformer and smoothing capacitors for every single supply cable…(as I am not sure 2 x 555 supplies cover the each entire supply cable…(I think some are grouped correct me if I am wrong) … 🤔 😱 ---
**Author:** ![Naim.Marketing](https://community.naimaudio.com/letter_avatar_proxy/v4/letter/n/bc8723/32.png) [@Naim.Marketing](https://community.naimaudio.com/u/Naim.Marketing)\ **Post date:** [November 6, 2020, 11:25am UTC](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450/506 "2020-11-06T11:25:24Z")
Well the Hi-Fi+ review is in - you can read it in full here. Summary = “Naim has done it again”. [https://www.naimaudio.com/sites/default/files/HIFI%2B%20November%205%202020%20-%20ND555%20double%20barrelled%20review.pdf](https://www.naimaudio.com/sites/default/files/HIFI%2B%20November%205%202020%20-%20ND555%20double%20barrelled%20review.pdf) [Previous page](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450.md?page=24) [Next page](https://community.naimaudio.com/t/2x555dr-vs-1x555dr-on-a-nd555/4450.md?page=26)