Global Feedback - A huge benefit for audio

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#2,142
Let's put the thread back on the rails though, what about Mauro Penasa's work I posted the link to several days ago?
Someone dare to judge it objectively, without killer sentences and/or patronizing words?

In my view, it has to do with feedback and some possible negative implications on the Amplifier-Loudspeaker interface, and should therefore be on topic.
 
#2,143
AKSA said:
Normally I don't agree with much of your posts, but this one certainly is 100% correct and points up that in any area where the experts disagree there are likely to be religious wars rather than logical discussion.
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It is easy to get de-railed by losing your focus. If you choose the accurate reproduction of music as your goal then it becomes easier to deselect the confident voices of those who do not subordinate their theories and rationale to musical experience.
 
#2,144
sottomano said:
I fail to understand why that should be important, since I use amps to amplify music for my pleasure and not for academic reasons.
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It was established earlier in this thread that trying to get as low distortion and as linear amplification as possible is a valid personal goal in itself.

What's the use of running 100m in less than 10secs except for personal satisfaction?

Jan
 
#2,145
sottomano said:
Let's put the thread back on the rails though, what about Mauro Penasa's work I posted the link to several days ago?
Someone dare to judge it objectively, without killer sentences and/or patronizing words?

In my view, it has to do with feedback and some possible negative implications on the Amplifier-Loudspeaker interface, and should therefore be on topic.
Click to expand...

Sorry I can't find that. Could you repeat the link?

Jan
 
#2,152
Penasa wrote:
OBJECTIVE: to improve the interface linearity of a GC (LM3875)

SOLUTION: To reduce the sensibility of the feedback loop to EMF [NFB is the main culprit in this problem] We will add a resistance [.27 ohm 5W] in series with the output so as to decouple the negative feedback loop from EMF and to decrease the dumping factor.

RESULT: a drastic improvement in immunity against EMF & a more “balanced” sound [see following FFT graphs] To be noticed the popularity of this tweak amongst GC fans! [a series output R]

CONCLUSION: I have measured and resolved a problem, which is “heard” by many.
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The use of a 0.22 ohm output series resistor was used by a well known amplifier brand in the 1970s and they use one to this day.
 
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