My open baffle project on ortho acoustic design ideas

[sondek12]

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.

distortion at 96 dB @ 1 m

 

[sondek12]

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.