Carl, My wife and I moved from Fl. to Id. In the process of moving, and after unpacking, I noticed that one of the woofers had collapsed. Have no idea what had caused this. Nothing touched the speakers during the move (we were very careful of that). I believe that it would take one very powerful amp to blow a woofer on the Infinity speakers. These speakers could activate the protection circuitry on my old Phase Linear amp with ease, and finally fried the amp. They also could shut down my MX1000, and it's rated to drive @ 2ohm loads. That's one of the reasons we switched to the Legacy Focus. Also being a much better speaker helped too. No problems now. Just sweet music with plenty of volume.