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  »  New  Tweeter for Vitavox S2. High-sensitively ribbons?..  Correction: Townshend Ribbon and sensitivity....  Horn-Loaded Speakers Forum     64  470316  10-19-2006
  »  New  The Active High Frequency Solution - AHFS..  Small problems with the camera lens can be mistaken for...  Playback Listening  Forum     5  32706  02-06-2008
10-16-2006 Post mapped to one branch of Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,325
Joined on 05-28-2004

Post #: 1
Post ID: 2964
Reply to: 2964
Null-set dipole butterfly tweeters.

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


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
12-23-2007 Post does not mapped to Knowledge Tree
horny
Posts 28
Joined on 11-19-2007

Post #: 2
Post ID: 6174
Reply to: 2964
Null-set dipole butterfly tweeters
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
Page 1 of 1 (2 items) Select Pages: 
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Tweeter for Vitavox S2. High-sensitively ribbons?..  Correction: Townshend Ribbon and sensitivity....  Horn-Loaded Speakers Forum     64  470316  10-19-2006
  »  New  The Active High Frequency Solution - AHFS..  Small problems with the camera lens can be mistaken for...  Playback Listening  Forum     5  32706  02-06-2008
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