change dispersion by dsp
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Topic: change dispersion by dsp
Posted By: airbell
Subject: change dispersion by dsp
Date Posted: 12 October 2011 at 8:08am
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Does anybody know how or even IF its possible to change the dispersion characteristic of a (single) speaker only by digital processing?for example some companies say their line array can change the HORIZONTAL dispersion angle.but which trick Do they use without changing the horizontal angle of the horn?cant imagine that... cheers |
Replies:
Posted By: Dref
Date Posted: 12 October 2011 at 8:42am
| If you by single speaker mean a speaker with multiple drivers then it is possible, to some extent, to control the dispersion. Because the interference can be varied by directly changing phase of on of the drivers, or by changing crossover point. |
Posted By: airbell
Date Posted: 12 October 2011 at 9:24am
| Hmm okay, and thx for the answer, but take for example the l acoustics kudo line source...okay it has 4 5inch mids so far i can follow if 2 are verical x 2 horizontal, but what about the hf? They have two of it but by a line array i can only imagine that they are vertical positioned, so how to change horizontal dispersion of the hf that way?actually impossible... |
Posted By: Dref
Date Posted: 12 October 2011 at 9:42am
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The cabinet incorporates the K-LOUVER® Modular Directivity Technology (Patent pending) allowing mechanical adjustment of the MF/HF directivity with 4 possible settings in the plane perpendicular to the DOSC® waveguides.
In that case i think that they actually have some wings in the horn which can be moved mechanically thereby changing the dispersion of the horn. Take a look at the animation under http://www.l-acoustics.com/kudo" rel="nofollow - http://www.l-acoustics.com/kudo -> Technology.
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Posted By: airbell
Date Posted: 12 October 2011 at 9:49am
Thanks  i didnt see it first coz my handy didnt show it 
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Posted By: Dref
Date Posted: 12 October 2011 at 9:57am
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Hehe no prob
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Posted By: Centauri
Date Posted: 12 October 2011 at 10:45am
These plates can be seen behind the grille in this photo:  |
Dref wrote:Posted By: Dref
Date Posted: 12 October 2011 at 12:59pm
| Nice. I like the idea. Haven't heard it in real world though. |
Posted By: Centauri
Date Posted: 12 October 2011 at 3:50pm
| The only time I have heard them, they sounded crap ....... |
Posted By: airbell
Date Posted: 12 October 2011 at 10:03pm
| Its really a nice idea, specially in long narrow rooms where a lot of people just hang any 90 or 120° line array and care nothing about reflections by the sidewalls... |
Posted By: Tocooltom
Date Posted: 14 October 2011 at 1:39pm
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Did anyone go into the Demo room at plasa next door to the funktion one room? Cant remember the companies name but they had some long thin speakers on the floor and in the corners of the room, and a small line array system set up which was ridiculously expensive. Basically the system used slight delays on each individual speaker in order to "direct" the sound to a particular place. The idea was for open public spaces where you need a PA but there is back ground noise, you can direct the sound to the spot where the people will be instead of wasting watts filling a whole room...e.g. a railway station They made me stand in a particular place in the room, then walk sideways and 1m back and forth in the room in front of this big long speaker laying on the floor, the sound was noticeably different in places and also louder in places. I was impressed but its not something i would have any use for at all, and the cost is crazy... |
Posted By: Pasi
Date Posted: 14 October 2011 at 1:42pm
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Yes. That was Duran Audio with their Axys range. Digitally steerable systems are out there from many manufacturers. Most common form is column speaker, used for example in churches or railway stations in big reverbant spaces. Idea is to adjust delay between drivers to aim the main lobe down where audience is. This gives better clarity and reduces reverb. |