the last sub i watched blow was a 15 inch kicker comp vx. they threw a 20hz square wave tone at it, with over 5000watts pushing it. clipped it like no other. the sub lasted a lot longer than i figured it would.. somewhere around 30 sec. I believe a hole blew in the cone at first, then it got MUCH louder for about 5 seconds.. then finally it seized. They were messuring SPL during it, and when the hole blew in the cone, it went up over 5 dB. That was a good day. I got to sit in the car while it burped over 155 dB. With hearing protection of course. If you ever have the chance to do that, you should take it! It was kick-ass!