How does the ZX507 compare to the ZX2? It may be time for me to upgrade if it sounds better than the ZX2. I have been waiting for a new sony android dap.

-Headphone(s) / earphone(s): IE800, IE80, MSR7, M50X, HD598, DT990, Shure SE215 -Any DAP(s) / DAC(s) / amp(s): Fiio X5 1st, Fiio X5 2nd, Fiio X1 1st, Sony Xperia Z3, Sony Xperia Z5, Fiio e17, Fiio A5 -Descriptions and links to review(s): None yet but would love to start -Geographical region...

-Headphone(s) you possess: Audio Technica MSR7, Audio Technica M50x, Sennheiser IE800, Sennheiser IE80, Beyerdynamic DT990, Beyerdynamic DT770 -DAP(s) you possess: FiiO X5, Sony Xperia Z3 -FiiO product(s) you possess (if any): FiiO X5, FiiO E17, FiiO E7 -Descriptions and links to...