My latest Roon setup - A Fiio M11 Plus, Roon Ready Android based digital audio player, shown with the Sennheiser HD800s, which are connected to the M11 Plus with a 4.4mm balanced cable (from Fog city Audio).
The sound is just suberb and the M11 Plus easily drives the HD800s to very loud listening levels. Since the M11 Plus acts as a Roon Ready endpoint (yes it runs RAAT) and runs the Android version of Roon Remote I even have the convolution filters for the Sennheiser HD800 loaded as well.
An absolutely fantastic little device. More information can be had from this thread: Fiio M11Plus ESS and M11S with Roon Ready is great!