The above post mentions a great point. Reviewing this thread, I don’t see confirmation that you haven’t set up a MUSE profile for the affected HDMI Zone as @Nils-Elling_Stubberu just mentioned. This will certainly create the downsampling condition - I’d double-check that first.
No MUSE profile and this would not explain the aforementioned intermittent nature of my issue and the ability to reproduce the problem now by hard resetting the Nucleus. If a profile was active it would always be active unless I changed during each test, which I am not.
The DSP you are seeing is inherent of the issue itself. When downsampling occurs DSP is shown and when downsampling is not occurring DSP is not shown. I have attached to show the settings for both sources HDMI A (aka Denon) and HDMI B just to settle this here.
I do appreciate your comment though as I am looking for any thoughts on why this is occurring. I believe I have narrowed down to Hardware/Software with all my testing but am always open to someone else’s take on this issue. Also I had believed it was a setting on my part for a long time but the exhaustive testing and posted results have disproved this over and over.
Thanks for the confirmation! Our development team would next like to test out ruling out the Denon device altogether - could you temporarily hook up a monitor or TV via HDMI and test for the same downsampling issue?
Completely unplug and disable the Denon device and only playback with a monitor/TV via HDMI, and let us know the results. Thank you! 
Confirmed. This has been done already if you look back on multiple postings. I can reproduce the problem with nothing connected to the ports or just a simple TV screen to verify connectivity.
John
Thanks for the confirmation @John_Klimaszewski, we’ll be discussing your case with our development team again for further analysis and instruction, and should have more to share soon. 
Thank you for the update
Btw if you look at my logs again I found the way to fix the problem temporarily but it goes back to downsampling about some sequence of tracks I play. You might be able to see something in the logs from Monday (3/24).
Hi @John_Klimaszewski ,
Can you confirm a more precise timestamp/track when you were able to temporarily resolve the issue? Are you able to temporarily fix the issue and let us know the next track/timestamp you are able to do this with?
I looked over your previous log set, but I see that the HDMI A still appeared to be downsampling, and the HDMI B didn’t. I wasn’t able to locate any instances where the downsampling stopped and returned.
It would have been the morning of 9/24. I would say between 9-11AM. But this is only my best estimate. I didn’t do an exact timestamp. If you don’t see anything on the log that shows tracks not downsampling that is interesting in itself because I definitely had it working briefly.
At this point I am realizing this is such a random situation we are dealing with. Right now I am getting Too Many Failures again when I try to play any track using HDMI A (connected). Timestamp would be 3/28 between 11:28 and 11:37AM. I’ve mentioned this before. This will resolve eventually but I don’t know how it resolves but it always happens when I unplug then reconnect HDMI A and even waiting about 10 min then it will start downsampling. Does this help at all?
I don’t know what else I can do to test.
Thank you again for your ongoing patience. We have everything we need in diagnostic logging at this point and shouldn’t require any more testing. We’ll share any next steps or workarounds immediately in this thread as we investigate further with QA and development.
Just an update. I spent the two weeks working with Denon. They are suggesting this is not a Denon receiver issue. I am totally confused at this point. From Denon’s point of view their receiver is just playing the music however it is passed to the receiver. In other words a downsampling would only occur if the music is being passed to the receiver at the lower sampling level.
I did verify that my older receiver a Denon X2400 does show the proper sampling but Denon dismissed this as just a handshake with Roon on my newer Denon-AVR110. This receiver is Roon tested as well.
I did resolve the minor issue of the music not playing with the error “Too many failures. Playback has stopped”. I just needed to add a delay of 1500ms and now all music even the downsampled music plays with no trouble other than the downsampling. This is good.
Otherwise I cannot test this any further. I learned a lot here but if this is a handshake issue this is beyond my level of expertise or control. I feel very confident this is not a configuration issue on the Denon or Roon nor is this a HDMI cabling issue.
I will wait for further guidance from you to help resolve this problem.
John
Hi @John_Klimaszewski ,
Thanks for the update. We are discussing next steps with the team and will get back to you once we have more information to share. Thanks in advance for your patience while this takes place!
Can you download the logs from about 2:30AM-2:45AM EDT Sunday 4/13. I was testing a few different settings in Roon and out of nowhere Roon started showing the proper sampling. I was primarily enabling different Audio Sources that still connect to Denon (ie HEOS and Airplay2) then I switched back to HDMI (renamed to Denon in Roon).
When I tested again between 7:45-8:15AM or about 5 hours later Roon started to downsample the same source again.
What is interesting is that Denon reports the Audio as being Unknown when it should be showing me the sample rate (format). And in Roon I was able to see the entire Device Setup settings (MQA, Max Sampling Rate, etc).
It is like Roon loses the settings as shown in Device Setup so it doesn’t know how high the sampling rate can be.
This happened before and I reported many weeks ago but this time I was able to capture screenshots to show you. All the photos are during the time that Roon started working again except for the last one which was taken when the issue resurfaced.
I can now reliably fix this problem but the fix is only temporary. If you are interested, I can get Roon to match the sampling rate of the Denon-A110 receiver by switching to another Audio Source then switching back to HDMI A (renamed Denon on Roon). I just keep doing this until the problem corrects itself.
The log on my Nucleus Titan should show the details of what is happening if you retrieve the log for Sunday, 4/13, 12:30-1:15PM.
The problem resurfaces ~several hours later without playing any music on Roon. I will keep testing to see if the resolution timeframe is consistent. I consider this a major step forward in troubleshooting this problem.
John
We’ve reviewed the events you’ve reported and shared in the last few days and escalated to Development. They’re actively working on this issue behind the scenes - we’ll clarify the timeline and provide more technical information as soon as it’s available. Thank you again for your patience.
Here is another interesting sequence: Once the HDMI port is downsampling and I disconnect the HDMI cable, Roon continues to downsample on that port.
It will continue to downsample until I go into Device Setup and change any setting then the settings reload and I can now see all the Sample Rate settings and Roon will play at the correct sample rate. Also if I wait about 3-5 min the port seems to reset automatically.
This sequence is repeatable every time.
This appears to demonstrate there is not an active realtime communication with the Denon DAC else you would think once the cable was disconnected Roon would immediately start playing at the correct rate again.
John
I read through this entire chain and realize I never sent a screenshot of what Device Setup looks like when the settings for sampling and MQA disappear.
Here you go:
First photo show Device Setup when I am able to do the temporary fix. The second photo is when downsampling is occurring and some of the settings disappear.
One more definitive test. I was able to borrow a Cambridge CXN100 and tested how my Denon-A110 receiver handles the input signal (Sample Rate). With this setup using the same cabling the Denon does display the proper Sample Rate that the Cambridge was outputting (192kHz in this test). I attached the Denon Information page for review.
Also I found a Denon article discussing “Unknown” Input Signals. I confirmed that HDMI-CEC was turned off on the Denon. I also verified again that that the Denon firmware was up to date and I had already performed a factory reset of the receiver.
The article suggests that if these troubleshooting steps are verified an Input Signal of “Unknown” is likely a HDMI handshake issue between the source device and the receiver. We discussed this possibility already.
Hope this helps.
