6 hours of normal volume. 24C inside. 9C outside.
OMG OMG, it sounds warm now! OMG the bass

. There's not only blackness in between high frequency transients, they are shimmering too OMG. It sounds very smooth. Bass is back

, the sound is more balanced now. There has been a tonal shift which makes me focus more on the bass than the highs, ah finally

. Everything sounds much louder now, dynamics are back too. It sounds 80% of what I had 2 days ago.
So it was the burn-in that was the reason for this! Minus 22 dB volume is not good enough to burn them in, it goes too slow, but it's good enough to maintain the burn-in. Usually I listen 6 hours a day so it burns in while I listen.