So, I rolled back to 1.2v for mod 1Z. In 1.2, every sound, eg: vocals, musics sounded thicker, bolder. This reminds me of how a good copper cable should sound. Like a hot steaming, good, thick coffee. Stability is the name here. I think this may be more suitable for WM1A, although that depends on one's sound preference and iem used.
Going back to 2.00v, soundstage, separation, resolution go up a notch. More importantly dynamics play a better role. Vocals are more expressive and has lots of feelings, music seems to be more 3D-ish? On some songs, music can sound amazing, some sounds can feel like its from miles away, you can hear how hard the piano notes are touched, echoes go on and on and on.I think the word here is expressive and alive.
I'm using modded 1Z with Warbler Prelude and Alo Ref 8 iem cable, and also use EQ. So, performance maybe a little harder to replicate.
The negative about rolling back and forth for the 2 different version is that I lost all the songs I have on the bookmarks and the need to rebuild the library, but can be done on the WM1Z/A itself. Be aware about this.
Play around and see which version is more suitable for you. For me, I really like version 2.00, it's really special based on sound quality alone and gives me goosebumps. I think brighter iem, eg: Andromeda or using silver cable should benefit well from version 2.00
Please share your impressions if you can