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RE: The single-ended nature of air !!!

First let me say Nelson Pass is a hero as far as I'm concerned. Second I don't doubt that air is asymmetric as Nelson claims. But while single ended amps are similarly asymmetric is not necessarily an argument for the use of single ended amps. The asymmetry of the air in the recording is best maintained by the most linear amp. It seems an asymmetric amp will only add to the asymmetry which would be a distortion. The question is whether a good single ended amp has less distortion than a good push/pull one, a difficult decision since their distortions are different.

I do agree with Nelson that negative feedback lowers linearity. I heard this on a demo years ago on an amp with variable feedback, although this amp happened to be a push/pull amp. Lowering the feedback made the performance sound more 'alive'.

I do have one totally trivial nit to pick with Nelson's use of the term ' single ended class A' since it implies the existence of non class A single ended hi fi amps. No such thing exists in audio. Single ended must be class A by the nature of single ended topology; there is no 'other side' of the amp to crossover to.

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