I just A/B'd the Amazon Prime Unlimited vs Audirvana on my Macbook Air with a Dragonfly black and a pr of hd600s. Selected track- AC/DC For those about to Rock.....great intro for testing guitar and kick drum.....Anyway it was NO CONTEST! Audirvana smoked APU. APU was lifeless by comparison. Still I make keed APU for access to 50m + songs.
Amazon Launches Lossless "Hi-rez" HD Music Service