Raspberry Pi rools OK!
No one seems to have noticed a change in my signature.
I've ditched my Mac mini/Audirvana+ front end in favour of a Raspberry Pi.
I won't say the RPi makes mincemeat of the Mac, but it's bloody good. Bloody good enough for SWMBO to say she'd heard things on a JJ Cale album she'd never heard before. She has only ever been so positive about a piece of kit when the first SECA hit the system.
So, the RPi is more detailed, more nuanced, more focused and clearer/blacker in its soundstaging.
Software-wise, I'm using Volumio, which seems to be the most actively developed of the audiophile Linux distributions for the RPi. I'm connecting to the Young DAC using a HiFi Berry Digi+ card, which gives me an SPDIF connection, so I don't need the M2Tech USB driver.
I'm still tweaking, but at around £80 all-told, I can't see myself going back.
I know one or two of you have had problems setting up an RPi, so I've started writing a how-to guide to get any non-Linux nerds (like myself) up and running.