That really sucks to hear about those sound issues, I really hope they get that fixed up by the time they hit LA. Accept's sound guy does a consistently fantastic job from what I've heard and saw a year ago, but Kreator's guy seems to be failing a bit so far.
Brocas Helm/Hatchet/Exmortus/Midnight Chaser 11/22
High on Fire/Kvelertak 12/12
Exodus/Nails/Hellfire (???) 12/20
Neurosis/Bl'ast!/YOB (???) 12/29