Someone posted some measurements of various android players in the Fiio x7 thread. The Onkyo was rolled off at the highs. Poweramp was even worse. The flattest was the stock Fiio player. Just saying. Hibyplayer was flat....not sure if you can listen to hidef with that though. Not sure what the measurements for UAPP are. I like the stock player on the ZX1 if that means anything to anyone. Oh, and Neutron player was flat as well.