jerg: yeah, 2 weeks sounds about right.
Btw, I found this quote: "Got a reply from Fang. +/- 25% in impeance fine, sound quality will not change much." I'm +48.6% in the left driver and +60.5% in the right. Lol
I didn't notice this before, very important info, thank you. So, I guess, anything more than +/- 25% is eligible for replacement.
Limits for channel imbalance must be, then, even lower than +/- 25%.
This means that any resistance more than 48 Ohm and less than 30 Ohm is out of manufacturer specs. Lots of measurements that I have seen here are out!