1) Has anyone tried the ZX1 with hard to drive over-ear headphones? (Sennheiser HD600s, T50RP modded headphones, etc.)?
2) Is the "line-out" (I guess via their WM-port) clean sounding and which amps has anyone paired them with?
3) Is sound quality a step up from either the FiiO X3 or iBasso DX50 and can it compete with higher priced (but crappy) DAPs? Not in terms of power, but in terms of sound quality? (especially when using the line-out option)
4) Has anyone measured battery life while ONLY playing music (either MP3s or FLACs) to see if it's up to spec?
1)... with my KEF's (not hard to drive I believe(?), volume is down 5-10% compared to using IEM's but still pretty loud, so at a guess you'd probably need to amp.
2)... both Headphone-Out & Line-Out are very clean with the PHA-2... others are using more exotic stuff with no complaints.
4)... battery life is normal Sony using RB music files, I normally get about 15hrs out of it (that's with F887, ZX1's battery is bigger)... Hi-Res I'm not sure about.