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In Reply to: RE: Measurements vs. Reviewers posted by mark.korda@myfairpoint.net on August 18, 2015 at 10:07:49
Can it even be measured?
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I once was in a room with Murray Zeligman and David Berning. The Berning BA150 being used had variable negative feedback. As the feedback was lowered the sound seemed more alive and lifelike to me although the distortion and frequency response were getting worse. I brought this up asking if they found any correlation between measurements and good sound expecting a negative reply. Yet both said yes and both gave me the same answer, linearity defined as if 1 volt in gives 2 volts out then 2 volts in should give 4 volts out, etc. the better this is done the better the fidelity.
How can the frequency response distortion increase while linearity gets better? They are the same.
I ask because my experience agrees with what you heard: the lower the negative feedback, typically the more life-like the sound. I just want to know what exactly is improving as the negative feedback is decreased. Thanks!
Because the definition of linearity of the amp designer was the one I gave and that's the one that correlated with good sound. The other person in the room made the 1st Berning preamp and also designed many quite unique tube amps and measured them to try to find sonic correlations also. They are two of the most creative designers I've known of.
Another definition is the degree to which the output signal matches the input signal.
That doesn't take into account if the amplification is linear, only if it is equal at all frequencies.
when was the last time anyone posted up a 20 or 50hz squarewave ..
A square wave test isn't that useable on a speaker. Almost no speakers pass them very well because of phase changes over frequency. I would be impressed by a speaker that does do square waves well but there are many speakers that are not linear phase and yet superb reproducers and in some cases vice versa. I recall the Bowers and Wilkens DM6 from the mid 70s which was a fine speaker in its day and would pass square waves over much of its bandwidth but with the improvements of speakers in 40 years would no longer be at the top of the pyramid.
> I recall the Bowers and Wilkins DM6 from the mid 70s which was a fine
> speaker in its day and would pass square waves over much of its bandwidth
> but with the improvements of speakers in 40 years would no longer be at
> the top of the pyramid.
I posted your 1977 review of the DM6 to the Stereophile website review
archives this past week, Allen. (See link below.) I used these speakers
briefly back then and thought your review caught what the DM6 was about.
John Atkinson
Editor, Stereophile
Thanks for link John, now I know who hahax is... Allen Edelstein.
sauarewave test suggested was for amplifiers not speakers , sorry i thought that was academic so did not specify .
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