Thanks. Will try. What are the differences in SQ between those two FW?
Sound Explosion is a combination of Optima (all the tuning features ) + Clear sound ( those he tuned the sound)
Optima is those firmware he keeps the stock sound but optimize UI, system ...etc
Clear sound : he modified for each of them
Sound explosion v1, v2 , v3, v4 .each of them has different sound tuning.
I'm on 1.2.7 stock FW. I consider it as giving spacious and neutral sound with slight warmth. Would clear sound Russian FW give spacious, and neutral SQ without this warmth?
yes, it is