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Old 19th June 2013, 09:31 PM   #21
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I finally came about to do some distortion measurements I trust on the finished speaker. This one is done at 96 dB @ 1 m, measured at 2 m distance in freefield. Second harmonic peaks at 1% at 1kHz and 7.5kHz which are intrinsic by design with the chosen units. Third harmonic is mostly below 0.1% for all but the lowest octaves, which I'm pleased with.

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distortion at 96 dB @ 1 m
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Old 19th June 2013, 09:37 PM   #22
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Quote:
Originally Posted by markus76 View Post
There's a paper by Kates which gives a very precise description how the optimum radiation pattern utilizing "trading" should look like: Kates, "Optimum Loudspeaker Directional Patterns", JOURNAL OF THEAUDIO ENGINEERING SOCIETY, 1980 NOVEMBER, VOLUME 28, NUMBER 11
Thanks Markus, I'm familiar with that paper. As far as I recall the dipole cosine radiation pattern is a fair approximation of Kates findings. But it has been a long time since I looked into the details of that paper.
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