I have the Ayon Auris II. It replaced a PS Audio BHK preamp. It was the single biggest improvement I have ever made to my system beyond my speakers. I was using it with the BHK 300 amplifiers which sounded really great but because I like the Ayon preamp so much I bought the Ayon Evo Epsilon monoblock amps to go with it. Now everything is even better.
I have never owned Pass gear so I can not compare to what you own.
Looking at the output impedence on the Auris and your XA60.8's input impedence, no concern in regards to impedence mismatch.
Build quality of Ayon gear is very good. On par with the Jeff Rowland gear I have owned and much better than the PS Audio. The remote is aluminum and feels good. It is small but I like that because I keep it in my pocket.
Good luck.
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