Pete, that would be true only for Clone mode.
@acousticsguru David, not so. In my setup for example, I’ve got the Upsampler configured to upsample to DXD, but with DSD Passthrough ON.
When I stream any PCM rates, they get upsampled to DXD. When I stream DSD64 or DSD128, they passthrough as is. But under all circumstances, the Upsampler to DAC always remains at AES3+4.
I just verified this (to check that I’m not imagining things 
), see for yourselves;
Glad you posted that. My settings are same, and I have never seen the DAC switch off of 3+4.
You guys are right! Same settings I use with the exception of the DSD filter choice in the DAC (with Spectral amplification, DSD Filter 5 sounds best), and it’s showing Dual AES for DSD64 playback, same as on Anupc’s pics (meaning I have no clue what’s causing the truncation - which, it seems, I’m not the only one to have noticed). So, using Mosaic, you do not get relays clicking when you play back a DSD file, nor truncation at the start (of files where the music starts immediately, of course, the truncation last barely a second or so)?
Greetings from Switzerland, David.
I can stream a PCM track and immediately follow-up with a DSD track; in between there is a slight audible switching that goes on (especially audible on my Bartok with headphones), but there’s no truncation of the DSD track’s beginning. 
Have you tried this with tracks where the music starts immediately, such as a track from a classical composition (not the first movement, obviously) that needs gapless playback when played back complete? To give one example of a favorite track, Horowitz’s Historic Return to Carnegie Hall Track 2 (the slow movement from the Bach/Busoni) in its unedited DSD transfer - impossible to play that back without adding a Ghost Track, as the truncation will make it sound like a false start.
Greetings from Switzerland, David.
I’m back after some time away from home, which is a good thing.
Similar to David, I hear switching sounds as the upsampler adjusts to a DSD track. I switched my clock cables around d and followed precisely the diagram in the manual and still have this issue.
In am using AES 3 and 4 for the upsampler to DAC connection.
I have DAC buffer set to on.
This is not a huge deal for me, other than 1 song. The acoustic version of Candles in the Wind from the Goodbye Yellow Brick Road SACD. No matter what I play preceding it, the stack clicks away, and the song picks up on the second downbeat of an acoustic guitar. It is kinda jarring.
I’ll keep thinking about this, I have a major system tear down and rebuild in the future to accommodate an Everest and move some components around on the rack, so I’ll get another chance to triple check all the connections.
I can’t imagine you’ll put the Everest on the top shelf, David…it’s…errr…rather a rack-unfriendly thang. 
Supposed to be lovely kit, though!
Unfortunately I don’t have that particular disc/DSD track to test on my system.
The stream board on the Vivaldi Upsampler does a pretty good job of handling track changes seamlessly, albeit, I rarely mix formats between tracks (not into playlists), but thus far I don’t recall ever encountering a problem with the start of a fresh DSD streams. 
I do have that track, and if I can get a chance today, I will see if I can replicate the problem using Plex.
Thanks, electrician is running the new pair of dedicated 20 amp circuits now, will be back up and running/listening later tonite and will double check all my settings then.
Well, I did a couple of mock-ups just to get a sense of scale. It was suggested I need to buy two Everest’s to maintain symmetry, but even I have my limits…
Audio dealers/makers and their crack runner fans. There’s always a way to dig into the wallet deeper. 
I’ve got an electrician here today, too. But not for my audio, thank goodness.
In the end I “settled” for one Everest…
I understand now that the truncation of the first second or so of DSD tracks is a known problem at DCS and a fix is in the works. It apparently does not affect all DSD recordings, is not going to be easy to resolve, and there is a workaround to use a USB to play these tracks (not worth my effort at this point).
I’ll be patient.
David, as turns out, I actual do have Elton John’s “Goodbye Yellow Brick Road (30th Anniversary Deluxe Edition)” double disc SACD with the “Candle In the Wind (acoustic mix)” track that you mentioned in a previous post. So, I ripped the SACDs to see if I could replicate your issue.
Yes, I’m experiencing the exact problem you describe with the truncation. However, only under one single condition; when played back via Mosaic immediately after a PCM track.
I tried a PCM 24/96 track, and queue’ed up Candle in the Wind DSD64. During track transition, the Upsampler switched through 24/96 to 24/176.4 to 0/176.4 and finally settled on DSD, and the truncation occurred.
The problem does not occur under any other circumstance, say if it’s preceded by a DSD track from the same or a different album, or even if I playback via Roon and preceded by a PCM track - looks like the Roon/RAAT stack on the Upsampler stream board is working as it should, whereas the Mosaic/UPnP stack needs some fixing
ps: By the way, this issue does not affect my Bartok, there’s no truncation even when playing back a PCM track followed by this DSD track via Mosaic. So, it’s just the Vivaldi Upsampler-DAC combination.
Here’s the track if anyone’s interested;
Anupc,
Thanks a ton for checking, and assuring me I’m not crazy…I have the same issue if I play a hi-Rez recording from Quboz after a PCM 24/96 recording too. I have poured over the Vivaldi manuals and changed every setting I can find to resolve the issue…I thought the DAC buffer would be the solution but nope. I question what purpose the DAC buffer serves if it doesn’t fix this specific problem.
I had my collection of SACDs ripped to DSD when I got the Vivaldi stack and sold them off along with my Puccini SACD/CD player and UClock, assuming I could achieve the same sound quality. The SQ is there, but the truncation is annoying.
It is not the end of the world for me, since anything I have on my NAS as DSD is also available in PCM but I play guitar along with my stereo, and it is kinda jarring for a song to start on the third strumming down stroke, as is the case with my DSD version, or a hi-rez version from Quboz, of A Horse With No Name. It is hard enuff playing the song, without giving the band a head start.
I’ve been advised that a subscription to Roon will probably solve the issue, but I’m happy using Mosaic as my interface, and don’t need Roon for anything else.
Cheers,
Mitch
David, would you kindly clarify your problem as it doesn’t seem to be exactly the same as Anup’s or as the other David ( acousticsguru) . Both of their issues involve changing from PCM to DSD whereas I understand your issue involves only PCM recordings ( all Qobuz files are PCM ). Are you upsampling the Qobuz track to DSD ?
Have you tried changing tracks rather than playing through?
Recall the Rossini issue is seen when jumping between DSD tracks, but not when playing from one DSD track to another; I don’t know what happens if you play from a PCM track to a DCD track, I would expect the same loss of the first .84 second.
Recall also playing .dsf via USB only works for tracks after the first; the first is always truncated as when the datastream stops it assumes it is PCM and the delay in detecting and switching to DSD is what is the root cause here.
By comparison, a network connection defaults back to PCM between each track, so it will always truncate the beginning.
The problem (at least on the Rossini) is that it takes time to determine whether a bitstream is PCM or DSD and if DSD switch to the DSD decoder.
However, rather than cache the data that is incoming while the detection and switch occurs as virtually all other DACs do, at least the Rossini either just drops the DSD data received to that point or sends it to the PCM decoder assuming it was PCM.
Imagine if you had to switch flow coming in from a main to one of two pipes based upon whether the content was water or alcohol.
Rather than build in a reservoir to hold a second’s worth of liquid flow while you decided which destination pipe got the flow, you just let whatever was in the pipe spill onto the ground while you figured out which liquid it was and routed it appropriately, or sent one second’s worth of alcohol down the water pipe.
That’s what dCS is doing in the Rossini.
The only solution at the moment is to use playback software that can insert a second of silence before each new track - the equivalent of pouring one additional second’s worth of alcohol into the pipe to make up for the amount you would know get spilled out/misdirected on the receiving end.
You’re right Bill; if I force a track change mid-track when playing back a DSD album over the network on my Vivaldi Upsampler, the truncation problem does occur. The Upsampler reverts to PCM before switching back to DSD. Same thing on my Bartok as well. So, the bug is across the family.
However, it does not occur when the album is allowed to play track-after-track by itself, nor when tracks are queued with “Add next”. No reverting to PCM between tracks then.
Likewise, no problem at all when using Roon to playback DSD tracks either, even jumping between tracks, the Upsampler never reverts to PCM (even with Resync Delay set to 0ms just to be sure).
I’m sure our dCS friends are well aware and working to resolve this with a Mosaic firmware update. 
Now that there’s been one, is your experience any different?
Similar issue as above. Vivaldi Dac and upsampler, no clock, but with clock cable connecting the two.
Using dcs’ own qobuz playlist: http://open.qobuz.com/playlist/2744707
Using Mosaic Play track two “Overnight”, then after a few seconds go back to track one “An evening I won’t forget.” The dac buffer doesn’t seem to help.
https://www.dropbox.com/s/klg3jdgpf5rsk13/Video%20May%2014%2C%205%2020%2046%20PM.mov?dl=0 Shows me starting the playlist from nothing and I lose a full second. Jump to track two which is ok enough, back to track one and I lose half a second.
