It makes the music sound less alive. I have a Mesa Baron amp, which has adjustable feedback levels, so it is easy to hear the difference. Increasing the feedback improves the specs, cleans up the bass a little, and robs the mids and highs of life and air. This matters less with heavily processed music (eg., pop or some rock,) which can even benefit (see "cleans up the bass" above) but it is fatal to acoustic or classical music.
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?
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?