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In Reply to: RE: FWIW JA and I often do not agree. posted by A.Wayne on November 16, 2015 at 20:42:11
Here's the problem: feedback is often inappropriately applied.
Here's a link that describes the problem quite well.
Its probably best if you read through all the parts.
Follow Ups:
Ralph , you missed my question, how much feedback is too much for Ralph , 1db, 10db, 20db, 30db ..? Would 10db be perfectly acceptable , no need to get into the academic stuff like stability and OL bandwidth , just the amount you would be comfortable with...
Go Rossi ......
All designs are different and what works for one may not do so for another.
I like a gentle overload characteristic and there is almost no way to do that if you are running loop feedback- the overload onset is rather sudden.
In addition I like lots of detail and tonal neutrality, which means not only no 2nd harmonic but also no artificial brightness. Both are colorations IMO. To accomplish 'no brightness', using feedback is tricky indeed (as it will generate higher ordered harmonics where they may not otherwise have existed at all) so I tend to avoid it.
It does not matter to me if this limits the speakers that I can use. If a speaker will not sound right unless the amplifier employs feedback; well, put another way its always going to sound bright due to higher ordered harmonic generation if feedback is used. Since that is an annoying artifact and a coloration, IMO/IME if the speaker needs the amp to have feedback the result is that it might sound like a great hifi but it will never sound like real music. IOW I like the speakers that have the ability to sound real- and that can only occur if the amp is low distortion and lacking feedback. Its a narrow path for sure, but it works.
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