Thanks for all the input guys.
I have one more question.
Is it possible with tracks that use synthesized bass or very low bass guitars as well as loud bass drums (for example, Soilwork) that the sub could have any issues with trying to play too many different frequencies at different volumes? For example, if its being pushed pretty far by a very low bass tone and then a flurry of loud bass drums (LOW drums, not 80hz) kick in over top of it, can it make the sub do anything that could damage it? Or is excessive power or clipping from the amp the only way this could cause a problem?
I've always wondered if different sounds could possibly hurt a sub or if nothing matters other than too much power or heat.