Sometimes, I connect my phone to my amp via a 3.5mm-to-RCA cable and play things on Spotify. I'm not much of an audiophile, so I don't really care about other sources at this time. I don't want to have my phone tied to the amp whenever I do this. Would there be any real difference between a Chromecast Audio connected to the Aux via the same cable I'm using and the Echo Dot connected in the same way in terms of sound? I was reading this http://blog.petersobot.com/echo-dot-vs-chromecast-audio-an-evaluation and thought it was interesting. Would it come down to voice control versus controlling via my phone?