Dynamic Headroom Testing of Audio Amplifiers

oldphaser

oldphaser

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#1
I will be placing some articles in this thread as they relate to "dynamic headroom" testing.

I will also be editing this particular post from time-to-time, as I find more appropriate verbiage.

"Dynamic headroom" was defined in IHF-A-202 (in 1978). I do not have a copy of IHF-A-201 (1966). If my memory serves me correct "music power" still existed at that time.

Essentially, "dynamic headroom" is the difference between rms power output and the old "music power" output rating.

So you will see some articles on "music power" in this thread.

Ed
 
oldphaser

oldphaser

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#2
Technical Talk: Testing Audio Amplifiers by Julian Hirsch (Stereo Review 1982)

Technical Talk: Testing Audio Amplifiers by Julian Hirsch (Stereo Review 1982)

https://www.americanradiohistory.com/Archive-HiFI-Stereo/80s/HiFi-Stereo-Review-1982-01.pdf
see pages 28 and 30.

In Julian Hirsch's article (on page 30) he stated that he was using a "General Radio 1396-B in combination with a low distortion mixer" for performing dynamic headroom tests.

I am curious as to what his technique that involved using a "low distortion mixer"? Did he use (1) or (2) 1396-B's?????? or something else???

Joe or Nick any ideas?

Ed
 
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oldphaser

oldphaser

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How To Test Audio Amplifiers-Mannie Horowitz (Electronic Servicing&Technology Apr 83)

How To Test Audio Amplifiers by Mannie Horowitz (Electronic Servicing & Technology April 1983)

https://www.americanradiohistory.com/Archive-PF-Reporter/80s/EST-1983-04.pdf

see pages 53-59.

"Dynamic headroom" is discussed on page 56.

For those wishing to add an "A" weighting filter (to perform a "A" weighted signal-to-noise measurement) to their measuring instrument(s) (i.e. AC averaging milli-voltmeter) see figure 3 on page 58.
 
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