NDS rings like a bell

With my CD5si - although not with the Bigger sleeve.   I improvised by sliding in a shimmy of folded cardboard in the middle at the behind. 

But along with the ringing glass and brass it's probably all scienced in.

Indeed, no doubt it's "scienced in", but it's a strange thing. I noticed it when I was calibrating the home cinema amp. I had to put a towel on the NDS because it was joining in with the speaker level test tones. The sound was clearly audible as the test tones stopped and the NDS continued to ring.

Keith

I noticed the same thing when installing my SN2.  It's weird.  Still, the music is wonderful, so it's all good.

It is indeed "scienced in" as you say.  Naim used to supply a damping piece that you could slide about on the back panel.  This was mainly to keep people happy who worried about these things, but also it was a sneaky way to show them that if they tried with the damping piece and then without, invariably it sounded best without... 

KRM posted:

Does anyone else find this surprising? Tap it and it rings. Speak next to it and it sings along with you.

Sondek's sub-chassis and platter ring and yet..

Chag - 

Thanks Richard, that's interesting. Perhaps the 555 streamer will ring even louder 

TOBYJUG posted:

.......all scienced in.

Top phrase-making.

Chris

I tried damping mine and it flattened the dynamics. Also a friend tried damping his, without telling me as we sat down to listen. After a track I asked if he had altered the system in any way as it sounded flat. He smiled and pointed at the damping, and once removed the sound returned to its best again.

The ringing is most annoying when playing loud on a track which stops suddenly, but the kit carries on singing its own tune.

Christopher_M posted:

TOBYJUG posted:

.......all scienced in.

Top phrase-making.

Chris

I think I might have been influenced by just recently watching " The Martian ". Specifically the scene where he realises that to survive " I'll have to science the sh#t out of this" 

As a science guy, I loved that line. I don't recall it being in the book.

Have the same with my 552,which I purchased 'preloved'.

i surfed the net looking for an answer,mentioned it to Naim guys at Bristol Show,spoke to Naim service,wondered if it was a result of sitting on a Mana rack, but nobody said that it was intentional.

Eventually,thinking it may not have been 'preloved', possibly moved without the suspension being secured, paranoia got the better of me and I decided to have it serviced and have the dr upgrade at the same time.I had the dealer include it on the service request but nobody offered an explanation.

Serviced and returned,still with no explanation to the 'ringing', I installed it and sat down to enjoy the 'fruits of my labours' and it still rang!

Yes, I do find it odd and it can be a distraction.

I have an  nDac/555ps and have recently flirted with the idea of replacing it with an NDS.

Not so sure now,do I really want to introduce another bell into the system?

Rusty I found my NDAC case used to ring.. Perhaps not as sonorous as some of the descriptions here, but it certainly did ring on my Fraim when set up right. I didn't notice the NDS was particularly different other than its case was larger.

Simon

Rustyneedle posted:

Have the same with my 552,which I purchased 'preloved'.

i surfed the net looking for an answer,mentioned it to Naim guys at Bristol Show,spoke to Naim service,wondered if it was a result of sitting on a Mana rack, but nobody said that it was intentional.

Eventually,thinking it may not have been 'preloved', possibly moved without the suspension being secured, paranoia got the better of me and I decided to have it serviced and have the dr upgrade at the same time.I had the dealer include it on the service request but nobody offered an explanation.

Serviced and returned,still with no explanation to the 'ringing', I installed it and sat down to enjoy the 'fruits of my labours' and it still rang!

Yes, I do find it odd and it can be a distraction.

I have an  nDac/555ps and have recently flirted with the idea of replacing it with an NDS.

Not so sure now,do I really want to introduce another bell into the system?

 

Hi Rusty,

Perhaps the ringing is inaudible in Naim's large listening room, but is a potential issue in "real world" settings?

i hasten to add that it doesn't bother me.

Keith

Allowing resonance of a case seems very odd, especially given the emphasis many people place on  minimising vibration or other acoustic transmission through mounting of source and even high signal items like power amp, as if there is any microphony effect via any components within the said case it will serve to increase the effect. That damping it is alleged to have a negative effect is even more curious. Perhaps it is something to do with the emphasis of PRaT that seems to be the intended focus for many - the 'Naim sound' - maybe having been found to be contributory it is now there deliberately to introduce an effect that the ears pick up as an emphasis of rhythm components, and that when damped you might be hearing a more accurate signal, but are conditioned not to like it. The mounting on Fraim or similar supports in this context makes sense, contributing by ensuring that only the designed-in signal emphasis occurs with the deliberately 'tuned' boxes...

Interestingly there's quite some discussion taking place currently on another hifi forum about the audio differences between the Akurate and Klimax versions of the Radikal power supply for the LP12. The electronics are the same, it's just that the case of the Klimax version is machined from solid. And this is just a power supply for a turntable! There's been no mention of ringing casing, just about the audio improvement. I'm going to request a demo because it seems difficult to accept. 

Hi Simon,sad I know,but I have just given my nDac and 552 the ring test.

I would not say that my nDac audibly rings and the composition of the two sleeves appear to differ.

Hi Keith, no I agree it's is not something I listen for,especially as Naim have serviced it,but sometimes I do here it echoing conversation in the same room or ringing, which is apparent when the music stops.

I had run olive amplification 52/250 for many years and had never detected ringing.

Richard's point regarding the damping piece,I think I remember seeing that,but never gave it a thought, or read about it in the considerable amount of magazines I would have bought at that time.My friends and I did a lot of 'tweakery' in those days,encouraged by Mr Belt!

Clive,my LP12 has long since lagged behind the rest of my system,hence my user name.I have a Lingo mk1, but I will search the forum out.Thank you.

Rusty, not sad at all, if we can't share our compulsive disorders here, where can we share them 

Until this thread came along I had not given the ringing much thought at all.  I did notice that the casing would ring on the SN2 while I was installing it, but have never been aware of it since.  I just shouted at it, and sure enough all connected up and in the rack, it does still ring slightly.  Hardly a distraction though, I've never noticed it once while listening, or in the fraction of a second after stopping a track etc.  Is an NDAC or NDS really that much more prone to ringing, or is this a non-issue really?  Perhaps the vibrations are absorbed by the casing, which helps to prevent them reaching the electrical components inside?

There is also the art of tuning in/out this ringing that's not just exclusive to Naim boxes.  What with decouplers by passing the devices feet - three, one under and near the mains transformer and the other two positioned in strategic positions under and between shelf and component.   Also a choice of decoupler composite material - steel onto brass, titanium onto carbon or aluminium onto wood/glass can all effect and alter intonation and timing.

if Naim were to ever bring out commercially a range of "tuning" accessories for its kit this forum would overload.

Some people spend considerable mony on brass resonators (cant remember the brand name), which are claimed to enhance music replay when placed in the listening room.

I have no idea if the above is relevant to this discussion.  The only thing of which I am fairly sure is that Naim pay considerable attention to mechanical vibration, and they seldom miss a trick to get better sound from their gear.

Charlie

Some have suggested this as an inexpensive remedy to case resonance concerns. Likely by inhabitants of northern climes.

For a time I experimented with placing a thick paperback book on my cases for the same purpose. In the end I found the books served more usefulness stored on a bookshelf.

I've been away.

Enjoy: - https://forums.naimaudio.com/to...03#19447375212588903

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