How does the PHA-3 driven by a WMPort cable from a modest Sony DAP (NWZ-A15) compare to the NW-WM1Z (or 1A, or AK240, or Lotoo PAW Gold, or other premium DAP) alone going directly into (preferably Sony, due to high output impedance of PHA-3) headphones? I have the PHA-3, Sony Z5 IEMs and Z7 headphones and am trying to determine whether there is any sound improvement with a high-end Sony Walkman. I understand that there is a convenience improvement with the Walkman. Thanks! (I have already read @purk's and @whitgur's comments around post #1532 of last November, giving the edge to the PHA-3 driven by a premium Sony Walkman e.g. 1Z, if the WMPort cable is silver custom rather than stock).