He uses the CAD Audio Transport mostly for streaming local files. I am not sure if he listens to Qobuz, it might well be. I will ask him next time I see him.
I have a friend, who owns Martion Einhorn speakers.. He is very happy with it. Martion has been at Munich during the High-End the last couple of years. Go, check it out, it's well worth it.
I have heard Geithains many times and I think they are fantastic. Currently I am looking at the Geithain RL906 for a small office system. They also have great subwoofers.
I don't know if this brand has been mentioned in the discussion. I have heard it a couple of times and I think they are fantastic amps, with enough drive/power for your speakers I would assume.
https://www.angstromaudio.com/angstrom-products/orn180
Your dealer should offer you the chance to listen the Airtight Pre/amp in your system and let your ears be the judge. I noticed, that the Airtight amp has more power than the EAR. What speakers are you using? Do you need more power?