No Air for macOS Catalina?

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One option might be to use Roon, which has built-in support for AIR, instead of Audirvana. It has a nice integration with Qobuz. Arguably quite an expensive hammer to crack a nut, but possibly the most elegant solution if you want something that avoids wires. There's a free trial so you'd at least be able check whether it would work OK in your set-up, and if so, whether you like it enough to switch.