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Amp/Preamp Asylum: RE: yes and no. by villastrangiato

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RE: yes and no.

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Despite your apparent reversal of the graphs with the descriptions (assuming you are suggesting minimal harmonics with the "zero feedback" case), your graphs and your post proves absolutely nothing. Feedback does in fact improve linearity and reduce distortion. It is an effective way of sacrificing gain for linearity and bandwidth by using a form of electrical damping. Most novices don't understand the true nature of feedback and its real world impact on performance. And unfortunately, snake oil salesmen and factually challenged "reviewers" love to capitalize on this misunderstanding or knowledge deficit to gain some level of control or power.

A very readable, well thought out, sensible, and accurate description of negative feedback can be found here:

http://sound.westhost.com/articles/distortion+fb.htm

You don't have to have an electrical engineering degree or background to grasp what is being said.

Also, as noted earlier, one cannot reliably attribute a set of distortion measurement findings to the use of feedback or lack thereof without attempting to operate the device with feedback and then without - taking distortion measurements in both instances. Citing the distortion patterns of two different amps and automatically attributing the difference solely to the use of feedback is idiotic since distortion has a multitude of sources - potential feedback oscillation being only one.


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