remote controlled hardware hifi player

[friendlyghost]

I am looking for a hardware media player, remote controlled using a smartphone app, which I can plug into my hifi amp and use to play music from my subsonic server (which is not anywhere near the amp). Could in principle build something myself using a raspberry pi or similar, but there must be others who have solved this problem before. Any suggestions? (any Sonos based solution is too expensive, IMHO).