I actually got mine today. One thing that bothers me is that the only lossless I can play is WMA which is fine I guess. Flac & Wav lossless doesn't work, wont show up in the player.
It does not really get too loud without an AMP which is sort of expected I guess...then again, I did expect more from Nokia, sound is clean though, no distortion very clear bass even with E7 pumped up all the way to max volume + phone to max volume.
Without an amp, meh ... with amp ... not bad at all. Clean sound, good bass reproduction. Unlike with other devices, when you cap out the phone & amp on sound, you get distortion due to double amp, you do not get that with the 920.
It kind of sounds like Ipod > lod > amp.
Trying to find a better player for wp8 though, stock players are never really all that.
Did find some players, but they are really focused on streaming from cloud / computer with cache so you can listen to your music even when you are not around a signal.
EDIT: I am going to see how this does with E11 once I charge it up, E7 is usually more rounded, also will dig up my OTG cable & see if E7 will work with USB OTG cable & Lumia 920.