It was this feature alone that I bought the LG V10. I was gutted when LG informed me they had no intention of releasing this in Canada but I chose to eliminate any possibility of a discount through my carrier and paid full price of over $900 for this... And couldn't be happier, it's that good.
With the great little app fix, playing music via Power Amp through my Sennheiser Urbanites is easily the best audio I have experienced. Just incredible. The ESS Saber DAC and amp are definitely worthy of their great reviews. I understand these are similar to what is in the highly rated Dragonfly USB dac. I know the latter has a reputation for being on the brighter, detailed or analytical side of the sound signature which suits my relatively dark Urbanites fine.
I am listening to a flac version of the Glitch Mobs latest and the sound is best described as immersive. I am swimming in the ocean of blissful music. The bass is just incredible, hard hits of firm tight bass with accurate decay. Sound stage and imaging are great, big and airy. My headphones had good side to side sound stage but not much depth or up and down however, through this player I don't notice that weakness. Such clean sound even when loud.
Speaking of "loud" I did have issues getting it to play with the gain not set low but I use the trick of plugging in just the cable first then attaching the cable to my headphones which tricks the amp to believe it's a line out and high gain. Now this things has oodles of clean power driving hard hitting bass for those of you bass freaks. If you have bass heads headphones you are in for a treat.
I bought this phone for the music and was rewarded well but I am spoiled by all the other features such as a camera I could not have imagined would be so capable plus the second screen that, for me, has been really useful and far more than the gimmick many claim.
This has been perhaps the most rewarding purchase I have experienced.
After my horrible experience with an HTC One m7 and it's crap camera and lagging keyboard this thing has been a dream. Love the V10.