Just got the latest CuBox i4Pro. the Bells and Whistles model.
Three generations of Music carrier (plus Zecora) by
c-g., on Flickr
The tiny 2" cube Cuboxi4Pro is a Quad Core Arm Cortex with quite a good GPU and running a shitload of data and sensor programs for the house as well as Volumio. The Cubox has a tiny energy footprint. 5v @3A it idles at just 250mA. It presently has Volumio, Kodi, Airport Streaming as well as local spam filtering and send me iMessages when downloads are completed. I prefer this to the RPI because it has a case, it has optical out, it has USB audio out (via device D0) and can quite happily hold 128GB SDXC cards and this store a lot of data and stuff. It's also a perfect chrome/android/Linux triple boot thin client and it can run from SD card eSATA or USB stick or USB Drive/SSD. It has Wifi and Bluetooth already built in.
Solid-run.com frequently have specials for $99 (just ended) and for that you get a LOT of computer. Far more than just an audio renderer for the Devialet. I think with a little work it could be a great Ubuntu workstation.
Hence Zecora, the Zebrapony
https://www.solid-run.com/product/cubox-i4pro/