Now here's a surprising thing. I just signed up for a free trial of Amazon Music Unlimited which is claimed to be CD quality and hence better than Spotify Premium. On the same song, it was hitting 4dBC lower than Spotify on the Firestick (103.5dBC).

I have to conclude Spotify is superior for dynamic range.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated