ultraRendu dropouts at DSD512 and 768kHz

+1 @designsfx 

FWIW, I have both uR and oR and have no issues upsampling to either 768KHz or DSD512 in HQP Desktop (of course, not all modulators / filters as this is computationally intensive).

Thanks for the suggestion. I haven’t been there specifically to check the forums, but it sounds like it might be worth a few minutes to check out. 
 

To be fair, customer service at Sonore and SmallGreenComputer have both been responsive to emails over the weekend, which is somewhat uncommon. I’m not convinced they have a solution right now, but to their credit, they do seem to care. 

@willrich47 

Have you checked the Dena and HQ Player forums at Audiophile Style? They seem to have direct lines to customer support over there (at least I’ve seen for HQ, Lumen, and Roon).

Discovered the issue. 
 

Sonore is having trouble with firmware version 2.9 working on all Denafrips models. I did an OTA update of 2.9 to make sure it was properly installed, and now the ultraRendu is completely unable to interface with the Denafrips. No music whatsoever. 
 

Customer support is trying to work with me to flash to 2.8, which I think means mailing out a new SD card. It’s going to take some time, and even then, I am not sure it’s going to work at the highest output settings (DSD 512 and 768 kHz).

I will report back when I know more.

DSD takes up a lot of bandwidth. +1 on making sure your core is wired to your router, not on Wifi, since it will take a lot of bandwidth in and out.

Also, make sure you are using USB 2.0 or better, not coax or optical anything between your streamer and DAC.

I use Roon to carefully eliminate bass modes and balance my two speakers, then my integrated's loudness control when appropriate.  

I had an issue with my OpticalRendu and I resolved it by moving my ROON Core server so that it was directly attached to my router. Great thing about the Rendu's is that they do not need to be connected to the music server.

I used to have my ROON Core on the slow side of my home network, on the PowerLine adapter part (using in-wall copper lines). The bandwidth on that part of my network was not able to keep up with the hi-res data that I was streaming. The issue was 100% reproducible using George Harrison's All Things Must Pass stream. Specifically a part of a song where George whistles. My music always got garbled a bit during that passage.

When I moved the ROON Core to the faster side of my network, the garbled sound on that passage went away.