I may have missed some of Al's recent replies, but we had a chat via PM and he has the DSD version of the AP1. I can use DoP with my non-DSD version but it doesn't show the correct volume for the track. That might explain why his impressions are different. Yes. the PP is powered separately from a USB charger, not my MB Air. I never found a difference in sound using computer power versus a hub for the AP1 after I got the Pure Power.
6/23/14 at 3:04pm