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Audio Discussions
Topic: Null-set dipole butterfly tweeters.

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Posted by Romy the Cat on 10-16-2006

As I have mentioned previously I’m slowly in a process of assessing other opportunities for my Macondo, since the EV T350 driver it too soft to be paired with Vitavox S2. While I am doing it an old observation keep knocking in my head. A few years ago I was experimenting with some tweeters over 10kHz and I detected that using them in indirect application was kind of “interesting”. At that time I did not use S2 but I took a note of the effect. I was making dipole with T350 drivers and ribbons, used Heil’s drivers and some custom made tweeters (inverted compression drivers) and I detected that when I positioned them back to back and turned them 90 degree off the MF horn direct line then HF turned out to be “fascinating”. I would not go into deeper explanations as I did not make those experiments with sufficient amount of precession and accuracy but now I would like to try something in this direction again.

Are anyone know any Harry Olson- level writing describing the mechanism of tweeters line arrays, parabolic arrays, hemispheric arrays or Null-set dipole tweeters? The Pro-audio folks uses them for years but I wonder of any theoretical research ever was dome into this direction.

Rgs,
The caT

Posted by horny on 12-23-2007
judging from your draving, they appear to be bipolar operating tweeters and not dipole. While I generally do favour the horn approach above all the others,
sometimes I do wish the whole reproduction would be less "dry" and bringing in some wide beaming tweeter energy does seem to be an interesting way of
ameliorating this "dryness". I don`t know what made you think in this direction, but the added reflections might improve the overall "subjective" performance
of the whole system.

Here`s a guy who once was a firm monopole tweeter radiation believer and was now converted to the opposite:

http://www.linkwitzlab.com/orion++.htm

regards

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