Here is my impression about DP-X1 after constantly playing with it for about two hours.
My IEM is Fitear MH335DWSR with toxic cables picolino. I don't own any TRRS balanced cable, so I can't test the balanced output. I'm comparing my impression with my ipod touch 5G connect to VentureCraft Go-DAP DD Limited DAC with MUSES01 OpAmp and output to Cypher Labs Duet (M2M is custom Nordost Frey cable).
First thing is that I don't face any volume spike during my two hours listen session like the one that Dopaminer experience when he try the demo at Onkyo shop in Tokyo. Most of my files are jazz and pop with different formats from mp3, wav, flac up to DSD.
Now let's get to the point. The first impression is that DP-X1 sound way better than my own stack which cost about twice of DP-X1. The background is so black that I can notice any thing on my fairly sensitรve MH335DWSR. Soundstage feel wide and have some depth to it. The separation is very good and precise. The resolution is superb. One thing that I firstly notice is that the bass seem to a bit less on this DAP. MH335 is very bass heavy iem, so I'm not sure what will happen on other iem. Good thing that You have 11 points EQ to help compensate it, if needed. More comparison on the sound will come later.
I'm very satisfy with the build quality of this DAP. It feels durable yet light weight. It come with the protective film for the screen. The screen is easily prone to fingerprint and I already scratch the protective film.
This is my first my messing with Android. I'm always on apple ecosystem, the UI seem very unfamiliar to me. Comparing to iOS, DP-X1 UI is very confusing to me at first. May be because it is my first time using Android. The responsive for the input is slightly slow compare to iOS. The volume change seem to take about almost 0.5 second to response.
Here are some pictures.