Here are my preliminary findings. I got the phone and uploaded a few flac files onto the lg music player. I used Q701 (bass modded) for listening. On more quiet recordings I was wishing for a little more headroom, but with my normal listen would probably not exceed the max of 75. On other recordings, I was listening at about 60-70. Impressions of the sound are pretty consistent with others. It seems very clean, detailed, and natural. While listening through the music player could have asked for a little more authority in bass and dynamics. Treble was airy very detailed, but had the potential to be fatiguing at higher volumes. Not so sure about the mids they sounded a little recessed which is not something I associate with the Q701, but I'm not that familiar with the recording I used. I would venture to say the sound overall could be considered slightly bright and possibly thin, but I'm used to listening to the Q701 on vintage amplifiers. Regardless, my very limited impressions are that this thing sounds good.
Here is where things get interesting. I switched over to Spotify with a track still playing in the lg player and then paused the track on the lg player. The phone continued to leave the dac and amp enabled; however, it could not be disengaged via the toggle switch. It continues to play music through the dac and amp until a notification comes through and then it disengages. You must go through the same process again to re-enable it. I have not done a comparison regarding the sound, but can tell you the Q701 were significantly louder while using Spotify. Like I said I'm not really familiar with the tracks I used. Perhaps they are typically low tracks, or maybe I did something when ripping them.
I would imagine it's only a matter of time before they fix this. It seems to me its definitely a coding issue. Those more savvy then I could possible theorize, as to who needs to make those changes whether it is lg, the individual apps, or google. This is an unfortunate oversight though given that they want to market this as an audiophile player. Not even those conducting the reviews were cognizant of this issue, so you wonder what audio enthusiasts who pick up this phone and have not read up on theses issues impressions will be. Unfortunately, between reviews and consumer impressions if they don't fix this, the audio quality of this phone might miss out on the attention it deserves.