If you use a really good reclocker right before the DAC to reduce jitter (any DAC in my experience will benefit from this), the streamer will not (relevantly) affect sound quality unless it does some processing (e.g. sample rate conversion). With this configuation, I ended up keeping only the bit-perfect optical out of a Chromecast Audio to stream content from Spotify (320k) and Qobuz (CD and hi-res) with stellar results in my very resolving audio rig. Without the reclocker or from its analog output, however, I wouldn't loose my time using the Chromecast for any critical listening. Generally speaking, I would keep away from using DACs included in streamers.