I have recently started getting into distortion testing of drivers (specifically, harmonic distortion)... not so much for just "consumer research" (I think Zaph and Mark K have that area pretty well covered), but more so I can find "problem spots" in a driver's passband.
I have been using Steps (part of ARTA) because, from my understanding, using stepped sine waves is the simplest way to get reliable harmonic distortion data. However, this is my first time using stepped sines; up until now JustMLS has served me very well; super-reliable.
Anyway, things SEEM to be set up correctly, but for some reason, my distortion measurements are coming out a bit weird. After testing a few drivers and getting some results, I decided to use a "control" driver (eg: one that has been distortion tested a lot): a Seas 27TBFC/G. Now I'm starting to wonder if I've screwed something up.
Anyone have any idea why the odd-order distortion is showing up so much louder than the even order distortion? Running sweeps of just the amp itself shows pretty normal results... 2nd order distortion about 80 dB down, everything else well below 100 dB, so I don't think it's the amp. I suppose it could be the Behringer mini mixer I use for a mic pre; but it's pretty much the same old UB802 everyone uses (oh, and the mic is an ECM8000).
So anyone with any experience doing distortion testing I would really appreciate any time or thought or input you could offer.
Thanks!
-Paul
I have been using Steps (part of ARTA) because, from my understanding, using stepped sine waves is the simplest way to get reliable harmonic distortion data. However, this is my first time using stepped sines; up until now JustMLS has served me very well; super-reliable.
Anyway, things SEEM to be set up correctly, but for some reason, my distortion measurements are coming out a bit weird. After testing a few drivers and getting some results, I decided to use a "control" driver (eg: one that has been distortion tested a lot): a Seas 27TBFC/G. Now I'm starting to wonder if I've screwed something up.
Anyone have any idea why the odd-order distortion is showing up so much louder than the even order distortion? Running sweeps of just the amp itself shows pretty normal results... 2nd order distortion about 80 dB down, everything else well below 100 dB, so I don't think it's the amp. I suppose it could be the Behringer mini mixer I use for a mic pre; but it's pretty much the same old UB802 everyone uses (oh, and the mic is an ECM8000).
So anyone with any experience doing distortion testing I would really appreciate any time or thought or input you could offer.
Thanks!
-Paul
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