I think one thing possibly missing here is that my sub gain was fine with the previous FW. I wonder if the defaults levels changed? I could definitely see the auto-cal routine possibly adding in a big attenuation too. I think expecting all setups staying under -15db with with the now working two channel offset is unrealistic. As I said earlier several people have already stumbled upon it. It is easy to work around but when it hits it has the potential to do damage to your sub, not a good thing.