Gunn
There is a big difference between clipping a PA system and overdriving an amp
overdriving an amp does not damage equipment but clipping the sound reinforcement system can do any number of things from shutting down the board to blowing voice coils out of the mains and that does not entail pushing the main faders or a single channel fader for that fact all the way up out of its head room range that can be done by simply having an idiot behind the board who does not know how to correctly use the gain knob or where the faders need to be set when EQ'ing. clipping can also cause really bad feed back as well;
(just a side note about feedback: if you know that your gain is not set so high that it should not cause feedback lower the 5K frequency on your graphic EQ, this should eliminate of any feedback. especially need to reduce the 5KHz when using any ambiance/reverb or echo effects if you experience feedback when using the effect and don't when the effect is muted. FYI if you cannot eleminate feedback with the 5K slider down then your gain is set too high. this note is in refrence to VOX settings but does not exclude instruments)
I have never seen a guitar amp speaker destroyed by dimeing the volume and Gain unless the speaker was under rated to begin with.
Like I said clipping the system and distorting a guitar speaker are two different things entirely In my own opinion
Please don't give me the definition of clipping