Congrats. You guys just saved yourselves a lot of money since DX100 sounds only average and likely the other DAPs such as HM-801 and C4 are not gonna sound any better than the Z1070 too. I agree on the laidback vocal but not the rest. Bass muddy and not clear on DX100? That totally makes me wonder what tracks were you guys listening to and the earphones you all are using.
I am using JH13 and trying to reach the level of my STAX SR-009 rig. So it is not that I dont have money to spend on the player. It is the sound that is not worth to me. For bass and vocals, I want to hear every separate beat and words even if it is very fast like in "Hatsune Miku no Shoushi tsu". The dx100 make it too bassy for me to take it on my JH13.
My opinion of the player doesnt mean the player is bad to others. I agree that Sony players doesnt have the power for power hungry headphones but for earphones it definitely have no problem... I am just telling others to go compare players before buying.
I have not use other headphones like my K702 on DX100 so I cannot comment on the performance for headphones.
The HM-801 is worse than DX100 as it is too slow for Miku songs...