Ill chime in regarding the Q701 from an HTC phone. When I had my One M9 with the Q701 I used it in the area of 70 to 85 percent volume and I don't listen all that loudly. For people that listen more loudly than me, the HTC phones probably wont be enough. The LG V10 on the other hand im usually in the 40 to 50 percent area of the volume control and it sound much better overall. The V10 has a ton more power with headphones over 50ohm.