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Thread: Dynamic Headroom Testing of Audio Amplifiers

  1. #1

    Dynamic Headroom Testing of Audio Amplifiers

    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

  2. #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...ew-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
    Last edited by oldphaser; 09-13-2018 at 12:04 PM.

  3. #3

    Understanding Dynamic Headroom by Len Feldman (Radio Electronics Dec 1978)

    Understanding Dynamic Headroom by Len Feldman (Radio Electronics Dec 1978)

    https://www.americanradiohistory.com...cs-1978-12.pdf

    see pages 53-55. NOTE: Unfortunately 2 pages have been folder over in the scan.

  4. #4

    Technical Talk: Amplifier Dynamic Headroom by Julian Hirsch (Stereo Review Feb 1979)

    Technical Talk: Amplifier Dynamic Headroom by Julian Hirsch (Stereo Review Feb 1979)

    https://www.americanradiohistory.com...ew-1979-02.pdf

    see pages 50 and 51.

  5. #5

    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...ST-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.

  6. #6

    A Musically Appropriate Dynamic Headroom Test For Power Amplifiers

    A Musically Appropriate Dynamic Headroom Test For Power Amplifiers by Peter W. Mitchell

    http://amplificadoresnextpro.com.br/...%20app_dyn.pdf

  7. #7

    Dynamic Headroom Test Generator by Tyson C. A. Hoole US Patent US4336499

    Dynamic Headroom Test Generator by Tyson C. A. Hoole US Patent US4336499

    https://worldwide.espacenet.com/publ...C&locale=en_EP

    or

    http://www.freepatentsonline.com/4336499.pdf
    Last edited by oldphaser; 09-13-2018 at 12:39 PM.

  8. #8

    MAXimum Headroom by Larry Klein (High Fidelity July 1987)

    "MAXimum Headroom" by Larry Klein (High Fidelity July 1987)

    https://www.americanradiohistory.com...ty-1987-07.pdf

    see pages 52 and 53


    NOTE: The scan of this document has pages that are not in sequential order. Pages 52 and 53 of the article appear on pages 54, 55 in the pdf.

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