So you ignore the VC crap yet Stephen stated it to be the issue and I've had another amp manufacturer (who also makes subs) point to it as a possible problem for an issue I was having. That tells me it is an issue that can effect an amp's performance. If the amp is 1ohm stable yet the subs go below rated impedence for too long, the amp is going to go into protection as it should. Not the amps fault.