Damping Factor and Overall Negative Feedback.

These specifications are assigned to some amplifiers but what is the difference between them? I had thought they were the same thing. I read the specs on a Karan Acoustics KSA 450 amp today with a high damping factor (?dumping factor?) and no overall negative feedback.

@almarg  Hi, I understand this post is from over 10 years ago, but could you please elaborate further on why, in areas where feedback could be beneficial, a good design calls for minimum or no feedback? It seems like it should be the other way around until the feedback reaches a balanced level, avoiding excess or deficiency, right?

A good design will require minimal or no feedback to provide good performance in the areas that feedback can help, and thereby avoid the downsides of excessive feedback.

Unfortunately, our beloved Al (almarg) is no longer with us. If you search the archives, you might find some of his insights that may help. Al is sorely missed, that's for sure. He was one of our very finest.

@waltersalas so very well said ! Miss him and this is a good reminder to savor his memory and contributions which were many.

to the recent responder, i’m not a big fan of negative feedback as Al eloquently stated because of the temporal distortions. There are designers who favor and those who disfavor the use of it. Volumes written, endless debate, cults created, etc…..

I will say this as a long time Music reference RM-9 amplifier owner and listener, it is an easy amp to evaluate the sonic temporal impact of 3 different levels of negative FB with, just be sure to level match. Draw your own conclusions.

@waltersalas @tomic601 

I'm deeply sorry to hear that, but his words of wisdom will remain with us. I will trace the archives for that. I wish that every amplifier will come with a switch for adjusting feedback levels.  Thank you for sharing that.

Two different things, although sometimes talked about in the same sentence. 

Often we can improve the damping factor and reduce distortion by increasing negative feedback, but it's not the only way to achieve this. For instance, adding more output stages can also improve the damping factor without requiring more negative feedback.