I have a Sony STR-AV570 receiver which I am trying to use to stream Spotify premium music (to Bose Acoustimass 5 Series II speakers). Which would result in higher sound quality? I currently have a chromecast connected to the hdmi port of my Samsung TV (which doesn't support Spotify since it is from 2013). The Samsung TV is connected to the receiver via RCA connectors. Am I better off buying the cables to connect an ipad air 2 or phone to the RCA ports of the receiver or would the sound quality be about the same? What I am doing right now is a hack. I have to leave the TV on (and turn the picture off via a menu setting to prevent image burn in) when I am casting my Android phone (playing Spotify) to the Samsung TV (with input source set to the hdmi port with the Chromecast connected to it).