[Eeyore]

Arny Krueger wrote:

The problem I saw was that ...... the amps
had a lot of nonlinear distortion related to the switching, well below
clipping. I mean like 2-3 dB below clipping.

Yes. For a while they had an application note that explained that. It looked
like 'fuzz' on the output waveform that's reminiscent of instability in linear
designs. It wasn't a disaster from a spec viewepoint since it was all beyond
the audio range but it didn't give one confidence.

Graham