I used to own the 535 and the 846, and I don't regard them as being very revealing iems, the treble is emphasized, but at the bold treble region which seems to lack a palette that the NT6 has which provide much more variations to the treble and over more accurate when it comes to transparency and therefore output micro details and reveals the resolution that is there. This was the situation when I compared the ODAC to the HP, I noticed treble not being as resolving as the DAC2 or the Hugo, and even the ODAC. Stage presentation was wide with the HP. I felt that HP sounded filtered to smooth out any roughness that can outputted by dynamically compressed recordings, and this would reduce the transparency with recordings in general.
So far I much preferred that ES9018S over the 2M version which the HP includes. The DX90 uses the 2M and it was less favorable to my ears, but this was a portable player with less power capability. Calyx M also utilizes the same chip, but is said to be warmer, so it's about implementation in the end. I've also listened to another ES9018S based DAC/Amp, the Anedio D2 which outputs the stereo typical Sabre characteristic. It outputs the dry forward treble details, which is great if one likes in your face detailing, but it's not accurate to the recordings. Dry treble characteristic is very noticeable with NT6. With headphones like the HD800, the dry treble is much less noticeable. I've also heard the ibasso R10 which utilizes the ES9018S, and it does output similar treble characteristic, but I thought it's the best portable performer I've heard until the Hugo and the AK240 which has different sound sig with cleaner treble. It was quite impressive for a portable player, but ui is horrible, laggy, and battery drains too quick.
Edited by SilverEars - 8/17/14 at 2:51pm