Actually, radio station announcers use a type of compressor called a 'limiter', which prevents overmodulation, but doesn't boost softer sounds like a linear compressor does. (The linear compressor is used by dbx noise-reduction circuitry, at a 2:1 compression, and a 1:2 expansion. A single device that does both is called a 'compander' [compresor-expander]) It's also why DJs sound so alike; the 'timbre' is all but lost.

Tweeters don't suffer the most because they have smaller voice coils, the suffer because they get the high-frequency harmonics caused by the square-wave-shaped clipped signal caused by over-driving an amp. An amp doesn't have to be overloaded in the 'too much power' sense, because clipping even occurs with NO load; it's purely a voltage phenomenon.

The only effect trying to draw too much power has is a lowering of the power-supply voltage (from voltage sag) when overloaded, which causes clipping at a lower voltage than would occur otherwise. Actually, this kind of clipping is 'softer' than the purely over-voltage (output transistor saturation) kind, which causes the most tweeter damage.

Larry
www.fineelectricco.com