Mark, hopefully, the tweeters are protected, but it may be that they're not. When a transistor amp is driven into 'clipping', which means it's being asked to put out a higher voltage than it's capable of, the voltage waveform has a flat plateau, which is where the output transistors are at full conduction.

At the points where the waveform goes from smooth curve to flat top and flat top back to curve, and the wave looks like the top has been clipped off, there are sharp angles in the wave. These points generate very large bursts of high-frequency noise, as would any square-wave. Unfortunately, the tweeters receive this high-energy distortion and the result is overheating of the voice coil.

The sad result is burned-out tweeters, and the only fix is replacements. In the future, "Keep your cousin off the phone."

Larry
www.fineelectricco.com