The sub was "properly broken in". I live in a small apartment and do not have the luxury of cranking it up even if I wanted to. What is "blown" was not the speaker, but rather, the amp died progressively in 2-3 days after two weeks of use. It was connected using LFE out of my receiver...
We can question the user or the product. In this case I think it was the product. I was pretty disappointed at the fact that I spent a couple of hours checking the cables, receiver, fuse etc and having to box it back up and having to deal with the people at Best Buy. It could have been just the unit I purchased, but after reading the forums and descriptions of "how it died", I am reconsidering the replacement order I put at Best Buy.
srobak: As far as your best guess, what you call "the only thing that makes sense", that a bunch of people who do not know how to appreciate it blow them up, although possible is not a good stance to take; I hope the guys at Klipsch do not take a similar stance. What if the unit you purchased malfunctioned? Even if someone takes the sub to its limits the minute they buy it, it is up to Klipsch to consider a design that is user-proof (at least if they are going to sell it to regular joe's at Best Buy). I repeat, The sub was hooked up using LFE out and was never "cranked up".
Ultimately, I am trying to figure out whether or not I should cancel my replacement order. How Klipsch deals with this will probably help me decide.