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RE: Class D , Class-a , Zmin and phase is Very important

Elliot's assertion that it is worse as power is reduced is exactly the point. As a percentage of power it increases, which is exactly what happens when the crossover distortion is constant and the main signal goes down. You do understand what relative means, right??

You would agree with me, I hope for your sake, that if crossover distortion is constant then as power goes down the % distortion of the main signal will go up. The way distortion is reported is always relative to a reference and not absolute. Otherwise, it would be reported in micro or nano volts and not as %.

Interestingly, many Class AB amps show a higher %THD at low power than they do at several watts. This might very well be because of xover distortion, and yes it is often a factor of 10 or more(usually shown on a LOG scale).

I said negative feedback doesn't eliminate crossover distortion and I am correct.


My point of showing those amps is two-food. 1) even many modern Class AB amps exhibit crossover distortion and most others you may not see it visually in the time based waveform but you see the effects in the FFT. 2) all those amps had significant levels of negative feedback and yet had pretty large amount of crossover distortion, which demonstrates that negative feedback won't tackle this problem when the output stage is under biased. A true Class B amp will be even worse.

You can't tell me these effects aren't audible in a highly negative way.

JA even states that it is crossover distortion in these examples.

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