I'm setting up systems for a couple of family and friends and have a line on a couple of used Marantz NR1504 AV receivers. They're far from top of the line at only 50 WPC but that's plenty and they seem to have a good reputation. The 1504 is DLNA 1.5 compliant. Like Oppo and others, you can use a smartphone app or the UI on your TV to have the 1504 "pull" files from a NAS or other device on the network for playback. But can you use a Raspberry Pi or other music streaming/playback device to "push" files to the 1504 for audio playback? Thanks for any info and advice.