First, congrats on being a member of a rarified club that clips kilowatt amplifiers. The flashing red LED just tells you you're clipping. The amp will play into clipping periodically without damage but the speakers might not like it too well. Eventually the amp will shut down due to thermal overload but it will do so gracefully. You really should consider biamping though. Maybe 7B on top, 28s on the bottom. Or 28s all the way around.