Love what the Vivaldi clock has done to my system. Tonight everything seemed off…compressed flat sound stage, dull veiled sound, less precise instrument placement, etc. Started checking everything and couldn’t figure out what was wrong and I was getting frustrated…wondered if it was a power issue in the grid etc. I have the Vivaldi clock display set to “off” since I often listen in the dark. Finally, I turned it on and out of my awareness, the setting on clock 2 was on 44.1 and not 48. I didn’t notice the clock change on the Rossini. Most of tracks I had been listening to were 192k, so without me knowing the system reverted to the clock in the Rossini instead of using the external Vivaldi clock. When I corrected this I was back to stellar sound I’ve been hearing since I got the clock.
Never happened to me. Never 
As @all2ofme says. This is not an issue that I have either experienced or even heard of elsewhere.
I can only surmise that you have inadvertently changed the setting and that this has been made more feasible by having the display switched off so that you were unaware of it until you noticed the sonic degradation.
I was being sarcastic, Pete — it HAS happened to me. I had both settings such that the music I was listening to on the Rossini wasn’t getting what it needed to from the Vivaldi Clock.
It needed a 48kHz multiple and both of mine were 44.1kHz (44.1 and 88.2 from memory). What a twit I felt. (I also felt vindicated at my recent spend on the Vivaldi Clock, however 
)
I am planing to audition a Vivaldi clock (vs my Rossini clock) at home. After reading this post, I understand that there are settings to be made, to get the best of a Vivaldi clock paired with a Rossini dac. What are these crucial settings? I listen to music via the Mosaic app (Tidal) in the Rossini Apex dac.
Thanks Ben. If several people are experiencing this perhaps @Phil should be made aware - another item for his inbox when he returns.
I have been giving this some more thought subsequent to the post from @harryb.
I do not think that Vivaldi clock can change clock frequencies on its own volition. Either one of the two panel buttons for frequncy has to be touched or there has to be an external agency.
There is an IR code for chnaging group 1 or 2 frequencies for Vivaldi and some earlier units ( but not for Rossini AFAIK). However I am not aware of the Vivaldi IR remote ( the plank) having access.Nevertheless it is possible for IR receivers to misinterpret random IR sources. Sunlight can cause this as can other sources. For example I had difficulties with settings changing back when I had a Paganini DAC and a CRT TV sited opposite. The solution was in a software revision adding settings lock. This has been carried to later units including Vivaldi Clock. I think that you both need to check that this is engaged ( Menu/Config).
Antonis, you first need to set correct frequencies for each of the two clock groups. Standard settings are clock group 1 44.1 and group 2 48. These are set from the two frequncy buttons on the panel. I suggest that once selected ( as well as clock dither if you prefer) you lock the settings ( Menu/Config).
You then connect clock outs puts group 1 and 2 to the related inputs on Rossini DAC.
You now need to select the correct synch settings on your Rossini DAC to “W”.
https://dcsaudio.zendesk.com/hc/en-gb/articles/360021859879-User-Manual-Vivaldi-Clock
I wasn’t suggesting it changed on its own…or that there is a problem warranting dCS attention. If the display is off (and I often have the displays in my headphone system set to off) it is certainly possible to bump the “Filter 2” button and not know you moved the frequency from 48 to 88.1. I’ve been in the rack making changes a good bit, and this is what likely happened.
The reason I posted about this was that it convinced me that the addition of the clock has led to true dramatic sonic change as opposed to a psychoacoustic effect of me convincing myself of dramatic change relative to $$$ spent…lol.
Of course, it’s always possible that I unconsciously bumped the button so that I could have this eureka moment to justify my Vivaldi clock purchase 
I’ll have to give this further thought.
Understood Harry. However as I suggested further on in this thread, make sure that you engage settings lock ( menu/config) and even if the buttons are accidentally touched or if random IR signals are received nothing further will happen and you can be secure with your decision.
Thanks Pete…I’m locked and loaded!
For me, a Rossini DAC + Vivaldi Clock is like a BMW M3 with Porsche car spoiler…
I would rather take the non-spoilered Porsche
I don’t think this is the best analogy.
I think slightly better would be: base Porsche Cayman with an appropriately sized (and in this case imaginary, to make the point) 911 turbo module added to the engine after purchase.
Better in all respects…
Hi Harry,
As someone always debating adding the Vivaldi clock, I’d like to get back to the heart of the matter ; )
Do you believe that “the system” reverted to a different setting, or that you accidentally touched a button changing the setting
Ben,
What was your experience please
Thank you!
R
Do you mean that in a positive or negative way?
I see it more like putting a GT3 gearbox in 993 based Carrera 4.
I had the display off and think I must have bumped the Clock 2 button shifting it from 48 to 88.2.
Was a while back — I think I’d just not read the manual properly. Has never happened since. Locking FTW!
Just kidding, I can’t judge things I’ve never heard before. If some folks love their setup then it’s all good- even if I wouldn’t invest in that order.
I highly recommend getting the clock. I was looking for a Rossini, but came across an excellent deal on the Vivaldi clock. I’ve never a-b’d the Rossini vs Vivaldi clock and would be quite interested in that comparison.
Would you rather start with a two-box Vivaldi set and add the clock later?