If you have music playing in standalone mode and the network control button selected then that is all you need on the HQPlayer side .
Open roon settings go to the setup page, select ADD HQPlayer, and then add the HQPlayer Server’s IP. After it is added, then you select HQPlayer as the output for Roon.
Your HQPlayer server is not on the Pulsar, that is just an endpoint, your server is on the Mac, from your description. You need to make sure that HQPlayer Desktop is running on the Mac and add the Mac’s IP address.
Roon sends stream to HQPlayer server running on your mac, which processes and sends it to your endpoint which is running on the pulsar and then it sends the audio to the Holo.
Here HQPlayer volume is turned down to -60 dBFS. You may want to turn it up… Roon can also do it for you once it works. But please never turn it higher than -3 dBFS! (to leave headroom for inter-sample overs)
I spent some time watching the tennis highlights and reading up on the fact that I would need a computer.
It will have to be a Mac and sit in a cupboard with my other hardware (modem, switch etc.). The intention would be to convert PCM to DSD256 and leave it alone. I don’t like fiddling with audio, I prefer to listen to music. It would not run anything else. Roon would still be on my QNAP.
You could save price of a Windows license with a Linux one.
Desired use case and form factor defines a lot, affecting price as well. MacMini gives you roughly highest performance per Watt, in a small form factor. This is good for a cupboard placement. But it also affects price.
If your DAC is to be directly connected to the HQPlayer server over USB, then it cannot be far from the DAC. While if it would be connecting over network to a NAA network endpoint, then the server could be placed in a basement or somewhere else within the home network infrastructure. And then the form factor is not as critical.
I have a basic 16GB Mini M1 for PCM to DSD256 with poly-sinc-gauss-* filters, ASDM7EC-light modulator, and Holo DAC corrections. It does the -super version of the modulator without DAC corrections, but DAC corrections take it over the limit, so I backed off to the -light modulator. If you can find a refurb 16GB M1, go for it, they aren’t easy to find currently.
Good. I own both a Spring 2 and a May (different locations). HQPlayer Desktop 5.7.2 offers corrections for Spring 2, Spring 3/May, and Cyan 2. Those are @jussi_laako’s “secret sauce” that I found beneficial with both Spring 2 and May. For me, with my sources and analog gear, ASDM7EC-light + corrections > ASDM7EC-super.
For Pro, it would be 32 GB. But it is more critical for the non-Pro base model, where the difference between 8 GB and 16 GB models is bigger. Maxing out the RAM takes all RAM channels into use improving practical memory bandwidth. So it does have a performance impact too.