Spotify at the highest quality is 320kbps, right? Is casting spotify from my iphone to a chromecast (as opposed to playing directly from iphone) giving me less than 320kbps? When I compare spotify via iphone>chromecast to cd or my own flac rips (via the same dac), the difference is sometimes noticeable. Obviously different masterings can cause this, but I'm hearing it where I think it's the same mastering.

Thanks