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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: If you want to understand what negative feedback is really about....read a text, solve the equations posted by Soundmind on August 17, 2006 at 13:37:27:
You still didn't answer my question, Soundmind. I asked you what you think the audible consequences of the feedback no longer working properly above a certain frequency, which is distribingly low in many cases. Tom Danley gives a good answer above, I suggest you read it. Just because the open loop bandwidth of the typical transistor amp is low doesn't mean they are all poor open loop. Many non-feedback amps have open loop bandwidths well beyond the limit of hearing. They are also quite stable when run in class A and reach thermal equilibrium (run it hot and you have stability in the power supply and in the circuits.). Many modern tube amps self-bias and compensate for changing tube parameters up to a fairly wide range.Finally, as the article Dan posted shows a high damping factor is not necessary to have a relatively flat frequency response so this benefit is dubious at best.
I think you should look at the practice more than the theory, they are not usually quite the same you know.
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- Re: If you want to understand what negative feedback is really about....read a text, solve the equations - morricab 14:07:00 08/17/06 (0)
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