Sorry (@fertb1978) to add another possibility:
7. Item being a fake? I do have absolutely no idea whether fake IE 900‘s exist at all. Of course, I searched this thread for the word ”fake“, not conclusive.
I bought them from a member of this forum, a person who seems trustworthy from his other posts and sales on this forum. With the purchase invoice and the sound I don't think they are fake, incredible soundstage, separation, etc... everything good is here, but they have distortion/saturation. It is evident having compared them with the fh7.