So, between the DAC and amp? I am using balanced connection between the DAC and the amp. How would that work if I connect the DAC output to the NUC that is running HQ?
You drop the Lumin completely go Roon NUC ethernet to hqplayer PC then usb to T+A.
Keep in mind that to get DSD 512 and higher into the T+A it either needs to be fed by a PC running Windows and the appropriate T+A driver, OR, Linux PC with Kernel 4.4 or higher only (as noted on T+A product webpage). I"m not sure what @Jussi is using for Embedded which means, you might need to run the appropriate Linux distro .
I’d worry that it would be underpowered to run HQPlayer at high rate DSD with some of the filter / modulator combinations.
Edit, or you drop NUCs completely. Build a big PC that will run Roon AND HQPlayer, then go ethernet to something like a Holo Red and then USB to the T+A. This would personally be my choice, since the Red provides both Roon and NAA endpoint options. Again, no Lumin in sight.
I didn’t want to mention it in my first post but I do exactly what you mentioned: Custom built PC that has Roon / HQplayer Desktop / HoloAudio Red / I2S to DAC/
14700K / 64gb DDR5 / 4070 Super / REW Convolution files. It creates a wonderful sound.
When you say a “big PC”, what do you have in mind? I need to pu this pc in my AV rack. I don’t want to have something that will generate a lot of noise and heat.
Depends on what filters and modulation you like to use. To put into perspective, my raspberrry pi 5 OC’d to 3100hz can run HQplayer DSD256x48 7ECUL with default filters with convolution.
I don’t tinker with filters anymore after gone through the entire exercise of comparing filters, the default are just excellent allrounder that sounds great with anything you throw at them.
I do have a 13600K desktop PC with a 3080TI that has no issues with DSD512x48 with any 7EC modulators and pretty much any filters other than maybe Sinc L…
For many practical configurations also Mac Mini with M2Pro should be good. Hopefully they update it to M3Pro soonish. For regular DSD256 output also basic Mac Mini 16 GB works fine. These are also compact and quiet.
For headless also some suitable PC running HQPlayer OS is good options. But there are so many possible variations for PCs that one would need to know a bit more about the goals to come up with something specific.
Then it is best to start with something like i9-14900K or 14900KS, fast DDR5 RAM and for example RTX 4070Ti Super, 4080 Super or 4090 GPU… You may still need to overclock it a bit.
Please remember that every doubling of output sampling rate at least doubles or quadruples the load. So you reach pretty high demands quickly…