I had just tried the dx200 (on amp 1) for a short while (1.5 hrs). I come from Onkyo Dp-x1 (and fiio x3 before that). Here are my thoughts. Note that one man's meat is another's poison, you have to listen and judge the sound personally before you purchase.
IEM1: Empire Ears Arthur + Excalibur cable
IEM2: Zeus XR Adel + plussound silver-gold litz (yes, unusual pairing, but it is my favorite combination for acoustic tracks)
Output: 2.5mm trrs
Impressions: (all equipments I used were fully burned-in.) Dx200 has an airy and transparent sound. It's bass quantity is controlled and textured. It is also slightly bright.
It didn't pair well with Zeus XR, but is awesome on Arthur. Both are very sensitive iem, and has some hiss when plugged into the dx200. The hiss is negligible on Arthur but quite significant on Zeus.
Compared to Onkyo DP-x1 (ACG mode), dx200 has a more extended treble and slightly wider soundstage. Imaging is equally precise. DP-x1 sounds deeper has thicker mids and somewhat looser bass. The DX200 is faster and has a more textured bass. I know this might be a preferred sound more many, I didn't like it, especially on the Zeus R + Plussound silver-gold combo, which is already very bright and lean.
As for Arthur, it sounds better than Zeus on dx200 in terms of bass quantity, but it still sounds marginally better on Dp-x1 to me.
This is not to discredit the highly anticipated dx200, it's simply that I don't enjoy the sound when it is paired with the particular IEMs I happened to pair with. However, I guess the dx200 would sound very good with Noble K10, Lime Ears Aether and Custom Art Harmony 8.2, all of which sound less analytical and have more mid-bass impact than Zeus.
As for the software, I found the Android UI responsive and sleek. The stock music player has 6 (or is it 8?) digital filters to choose from, much like the Dp-x1. Each filter yields a slightly different sound texture without altering the overall sound signature and presentation. However, the filter settings seems to be exclusive to the stock music app, as opposed to the global implementation in DP-x1, so one may not be able to choose the filter when usong third party music apps or streaming services. Hopefully they can implement the digital filter as a global setting in the upcoming firmware updates.
I didn't have the time to test out the Mango system so I can't comment on that. On a side note, the battery life dropped by around 10% during my period of usage, and there's a significant amount of heat produced by the DAP.
Personally I don't see it as an upgrade from the Dp-x1. It is definitely a boon that it has a swappable AMP unit, and I would like to see more amp modules with different sound signatures. The Android system also needs to be improved to make the dap more power efficient and utilise the sound chips optimally.
