*Yawn* You worry too much. Steve is a pro. He knows how to handle anything. In fact, if I'm not mistaken, someone from Kicker.com hooked up four, KX1200.1 to a pair of S8"L7 and reached 150dB without a single problem. Just to show you that it's all about installation with a nice of knowledge in the background.
(Ya know they can't put it on the Internet if it's not true) (were did you hear that?) ( the Internet!)