What is wrong with negative feedback?

I think you will find the answer to your question if you read about amplifiers by Soulution. Apparently, their research showed that in conventional amplifiers, the negative feedback that was applied was slightly out-of-time with the signal it was trying to correct, therefore throwing off the coherence of the original signal. I remember years ago hearing a similar criticism of the servo systems in Velodyne subwoofers. Anyway, they supposedly found a way to corrrect that problem, and I think that it is their position that negative feedback is not a bad thing when it is implemented in the way that they do it. The only bad thing is the price of their amplifiers...whew!

There's open loop (global) and closed loop (local). Few designs can be stable into low impedance loads without some feedback and, if you read carefully, some advertise "no global feedback" and sometimes forget a word. In the case of op-amps, it's usually already there.

Easy to find all the negative things about negative feedback. I'm still waiting for someone to advertise positive feedback as being better :)

What about feed Forward ?

Like this?

http://www.wolcottaudio.com/WA_presence.htm

Appreciate Wolcott's integrity.

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.