tuga
Legal Alien
It's not the negative feedback per se that causes problems. As discussed in the paper I linked above (also by Otala), the distortion occurs if the amplifier's open-loop bandwidth is exceeded and this leads to internal voltage clipping.
It's all a bit over my head to be honest.
That paper is not free to download. I have this older Otala paper in my library:
Transient Distortion in Transistorized Audio Power Amplifier
Matti Otala
lEEE TRANSACTIONS ON AUDIO AND ELECTROACOUSTICS VOL. AU-18, NO. 3 SEPTEMBER 1970
Abstract
This paper discusses a new kind of distortion mechanism found in transistorized audio power amplifiers. It is shown that this distortion arises from the multistage feedback loop found in most high-quality amplifiers, provided that the open-loop transient response of the power amplifier is slower than the transient response of the preamplifier. The results of the analysis are verified by measurements from a simulated power amplifier, and a number of constructional rules for eliminating this distortion are derived.