I sent a message through the head direct site about my imbalanced he 400's issue 2 days ago.
Do you now a direct email adress or person at head direct where I can describe my problem ?
http://www.head-fi.org/u/292104/hifiman-us this one given by MattTCG is ok for my situation ?
It's weekend so they won't answer until Monday when they get into work.
This is the email I've always used to get in touch with their customer service guys:
Just send a simple email requesting a replacement, mention your transaction number etc, and the imbalance defect of course.