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What is wrong with negative feedback?

I am not talking about the kind you get as a flaky seller, but as used in amplifier design. It just seems to me that a lot of amp designs advertise "zero negative feedback" as a selling point.

As I understand, NFB is a loop taken from the amplifier output and fed back into the input to keep the amp stable. This sounds like it should be a good thing. So what are the negative trade-offs involved, if any?
solman989

Showing 1 response by magfan

magfan
1,583 posts
 
I don't believe it is fair to talk about damping factor without mention of speaker 'Q'.
A hi DF and a 'Q' of over say....1.3 will still produce sloppy bass as will a very low DF and a critically damped 'Q' of .707
Also, no mention has been made of Voltage source vs Current source amplification, and the speakers which are best suited for each.
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