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Moderate use of negative feedback

But what is moderate? As I understand, it's demonstrable that "moderate" of say 10 dB), reduces 2nd and 3rd harmonics moderately but introduces higher order harmonics. However substantial feedback, say 40 dB, substantially reduces ALL orders harmonics including the higher order ones.

Here's a graph curtesy of Nelson Pass (of all people, and advocate for low feedback) that illustrates this point ...

?

In a similar concept, global feedback consistently reduces distortion across all stages of amplification. The "time smear" argument is invalid because the feedback propagation is typically a small number of microseconds that put delays orders of magnitude above the audio frequency band.




Dmitri Shostakovich



Edits: 07/01/12

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