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Amp clipping is a little different. If you overload the input of an amp with a 'small signal' it will produce an amplified version but that will basically be DC not AC, that's a danger to voice coils.
If you look at the nominal input of your amp it could be around 0db, your mixer could be sending +24db when it's in the red. That's essentially +24db headroom which you can use for brief periods of time but is otherwise overloading the amp. If the amp doesn't have inbuilt limiting it will overload, clip and try to fry the coils.
That's my understanding of it from a few years of playing about, I wouldn't claim to really understand it all.
Airhead
amp = 80w
speakers 50w
i don't know how i work out amp headroom...
i can obvs run it until the speakers distort, and that should happen before the amp clips, no?
n.o.v.i.c.e.