I have never really been clear on what hurts a speaker. Will the popping sound on vinyl hurt speakers? What about distorted material i.e. track 9 on Bjork's Homogenic album? This song contains digital distortion. What doest hurt a speaker?
From your amp or receiver's perspectives ... mostly "dirty" power will damage speakers. Said differently, running your amp to the point where it begins to clip/break-up, will damage your speakers.
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