Thanks
@morgenstern09 that I have the privilege to try the seasons FWs with my stock 1Z. I also have a Romi Blackgate modded 1A but for the interest of most members here, I shall share my view on the 4 FWs briefly here (in sequence of my preference) with my stock 1Z:
Player - Stock 1Z, Firmware Version 3.01, Region: Universal / Japan
IER - FiR Audio M5, PW Audio Mercer 4-wires, 4.4mm Balanced Out
1. Autumn - A thick and smooth mid makes it perfect for vocal. Bass is deep with smooth treble, with an impressive soundstage and resolution. For me it is the one for soft jazz vocal and pops.
2. Spring - A perfect balanced low, mid and high. Nothing stands out but it works in a harmonic way. Recommended for all genres.
3. Winter - Similar to autumn but with a deeper bass. Soundstage is a bit narrower than Spring and Summer. Suitable for Jazz / pops / rock.
4. Summer - Amazing soundstage and resolution, mid is a bit thin but overall a neutral tonality. Suitable for Live Album / Classical.
What impressed me most is the smoothness of the high for all seasons of which I am a bit sensitive on. I think technically these FWs are not stressing much on hardware capability of the device and the IEM, but overall musicality and tonality is fantastic. I can easily listen for these FWs for hours.
Thanks again
@aceedburn and
@morgenstern09 for your contribution and unselfish sharing.