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Thread: Subjective Evaluation of Distortion Performance

  1. #11
    Senior Member
    Join Date
    Sep 2010
    Yeah been reading that too. Then Troels had some ribbon tests that was contrary to Zaph's from what I remember.

    Just had me thining.

  2. #12
    Senior Member cvjoint's Avatar
    Join Date
    Mar 2011
    Northern California
    Real Name
    Hmm, found this thread today on Google after posting something very similar on Diy lol. Geddes is an interesting character, for example:

    Dr Earl Geddes Summa loudspeakers and kits - diyAudio

    He doesn't believe his own metric is worth computing lol.

    From what I can tell his data doesn't always follow his conclusions. Certainly in his papers THD and IMD even when used as crudely as he uses them have some predictive power. I would be curious to see another THD/IMD vs GedLee metric where THD is at least only measured for frequencies that matter, like bellow 10khz and so on. I think THD is only a poor tool if used really crudely.

  3. #13
    Senior Member
    Join Date
    Oct 2010
    Just getting to this thread now...

    1) Adam, I could have sworn there were VST plugins to do what you wanted, re: adding harmonics. I'll try to see if I can find some (thinking Voxengo...).
    2) cvjoint, that can easily be computed by filtering the harmonic distortion before computing its energy. I thought this was routinely done, no?


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