too little power
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Here is a rule of thumb: if you regularly drive your system into distortion, eventually it will break.
Most commonly, pushing an underpowered amp to the point of distortion causes excessive heat inside the tweeters. The heat melts the tiny wires in the speaker windings to the point they act like a blown fuse and short out. Driving woofers into distortion can misalign their suspensions. Constant abuse can tear them apart. If a woofer cone has jumped out of the gap it lives in, sometimes you can reseat it by hand and everything will be ok.
The occasional pop is probably ok. I doubt any recorded distortion will hurt them, so long as the distortion is reproduced cleanly :^)
Rosstaman makes excellent points! You should also never mention in front of a speaker that it lacks bass or does not image well. Do not compare monitors to full range speakers - in extreme cases they have been known to cry. Also (very important) NEVER mention - even in passing - that you would like to try an electrostatic speaker when in earshot of a dynamic speaker or vice-versa. This is extremely gauche behaviour!
Really offended speakers have been known to get even by eating the output devices of your favorite power amp or intentionally smearing vocals and string instruments. Speakers are also capable in extreme cases of transmitting subliminal messages to new/prospective dating candidates - Ya don't want your speakers hinting to the new girlfriend that your have crabs, DO YA?
Be nice to your speakers and they will in turn be nice to you.