Clipping begins to shape the waveform like a square wave, generating large products at ultrasonic frequencies. If it is the preamp clipping this high frequency garbage can send some amps into oscillation exacerbating the problem. Other amps can amplify it just fine, passing it right along to the speakers at great levels. Moving coil tweeters do not like substantial amounts of energy at ultrasonic frequencies, the rise time is too fast and the power too great. If you wish to persist in this I would suggest a simple ultrasonic filter at the input of the power amp with a knee just over 20K and a steep rolloff.
10 responses Add your response