it looks like an HDMI connector and physically it is but its not using HDMI electrically - its I2S and what you are proposing will not work and might destroy the DAC I2S input and perhaps the UltraRendu too.
You need something like a Singxer SU1 or SU6 to get from USB to I2S
IIS Port
X-SABRE Pro is equipped with the most complete input ports of this series, in addition to optical, coaxial, AES/EBU, USB ports, we even added a IIS·LVDS input via a HDMI connector to differential transmit IIS signal, maximize the transmission performance of the IIS port, to make the data from the short-distance transmission between the chips into high-speed interconnection between the devices, get rid of the USB transmission or S/PDIF transmission re-encoding, and let the original digital audio stream directly into the D/A chip.
currently Roon won’t get to more than DSD512 upsampling
I was looking at the SU-6 and other DDCs that can turn usb into IIS but I wasn’t sure they support DSD1024? As far as I can tell they only seem to support DSD512?
I forgot to mention I’m using HQPLAYER with my Ultrarendu and HQPLAYER allows DSD1024 signals.
Hey @Jesus_Rodriguez So the SU-2 DDC supports DSD 1024. Hqplayer supports DSD1024. and my Matrix X Sabre DAC supports DSD 1024. Does the Ultrarendu have to support DSD 1024 for me to be able to stream at DSD1024. Okay… I’ll stop saying DSD 1024 before I go crazy!