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Audio and Video Talk
Acoustics & Room Treatment
In room frequency response = sick puppy
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<blockquote data-quote="Hennie" data-source="post: 38955" data-attributes="member: 20"><p>The idea behind distributed subs is to excite different room modes. Separating the subs gives a smoother response overall. I don't want to get involved in too many arguments about this, except to say that this technique was developed by Dr Earl Geddes who did his thesis on small room acoustics. Todd Welti, John Kreskovsky and Genelec have variations on this theme. JBL sells a sub controller specifically designed for optimizing multiple distributed subs. Another one, based on Welti's research, is in the Harman Group's pipeline and will AFAIK bear the Harman Kardon brand name.</p><p></p><p>It is not necessary to have a fancy sub controller to exploit this technique. The Geddes methodology relies on random placement of the subs, and adjustment of the low pass filter frequency and the phase control. Geddes recommends at least three subs, but two will already yield an improvement over 1. I think in this case, overlap between the mains and two subs, distributed, moved around and adjusted for the smoothest response, will give the best results.</p><p></p><p>The corner and mid wall positions are suggested as starting points, by all means move the sub around, use the controls, measure and see what works best.</p></blockquote><p></p>
[QUOTE="Hennie, post: 38955, member: 20"] The idea behind distributed subs is to excite different room modes. Separating the subs gives a smoother response overall. I don't want to get involved in too many arguments about this, except to say that this technique was developed by Dr Earl Geddes who did his thesis on small room acoustics. Todd Welti, John Kreskovsky and Genelec have variations on this theme. JBL sells a sub controller specifically designed for optimizing multiple distributed subs. Another one, based on Welti's research, is in the Harman Group's pipeline and will AFAIK bear the Harman Kardon brand name. It is not necessary to have a fancy sub controller to exploit this technique. The Geddes methodology relies on random placement of the subs, and adjustment of the low pass filter frequency and the phase control. Geddes recommends at least three subs, but two will already yield an improvement over 1. I think in this case, overlap between the mains and two subs, distributed, moved around and adjusted for the smoothest response, will give the best results. The corner and mid wall positions are suggested as starting points, by all means move the sub around, use the controls, measure and see what works best. [/QUOTE]
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Audio and Video Talk
Acoustics & Room Treatment
In room frequency response = sick puppy
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