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In Reply to: RE: It is not a tricky issue at all posted by Lew on October 13, 2010 at 07:03:14:
That's feedback.
Moderate feedback (like in this case) reduces low order harmonics (about 12 dB), but creates higher order ones.
In real world you can not have, at the same time, a completely filled in cask and a drunk wife (this is my best translation of an Italian proverb).
I suppose this is the reason why excessive feedback has such a bad reputation and why it is generally accepted that a good basic design (with inherent low distortion) is needed before ever thinking of applying NFB.
I realized this fact by extensively playing with simulations and this is the main driver for adopting frequency selective feedback instead.
If feeedback is vanishing away (starting from a few KHz), the creation of potential high order harmonics, that would be otherwise created by flat frequency feedback, is automatically prevented.
In conclusion, I think that, based on a careful case by case assessment, frequency selective feedback can be effective in improving audio performance.
Best Regards
Luca
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Follow Ups
- You are absolutely right! - 6AS7_6SN7 00:44:26 10/14/10 (6)
- RE: You are absolutely right! - Ralph 11:05:49 10/20/10 (3)
- RE: You are absolutely right! - Banat 05:28:04 10/21/10 (1)
- In this particular case I have found that.... - 6AS7_6SN7 11:35:59 11/28/10 (0)
- We made all the points quite clear....... - 6AS7_6SN7 23:56:08 10/20/10 (0)
- RE: You are absolutely right! - Lew 19:51:52 10/14/10 (0)
- RE: You are absolutely right! - Banat 10:10:48 10/14/10 (0)
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