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MultiWay Conventional loudspeakers with crossovers 

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6th December 2012, 12:24 AM  #51 
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Join Date: Feb 2002
Location: Western Sydney

http://www.umcs.maine.edu/~markov/GoldenRatio.pdf
this is a better copy: http://www.cdlmadrid.org/cdl/htdocs/.../markowsky.pdf
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency 
6th December 2012, 02:25 AM  #52 
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mathematically what numbers do you want for the dimensions? What should the numbers satisfy?

6th December 2012, 04:05 AM  #53  
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Location: in half space

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I'd rather go with JeanMichel's 1:1.5:2, which apparently causes a lot more cancellation, and produces a dyadic "power chord" which is less likely to generate unpleasant overtones in whatever resonances remain undamped. Well, no, but I'm thinking of all those people who won't listen to you about damping. 

6th December 2012, 07:09 AM  #54  
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Hello David,
The ratio on the graph are just the ratio between the combined L, W and H in Rayleigh's formula : http://www.bobgolds.com/Tangental/Ev...deEquation.GIF Taking a given dimension as 1 allows to apply the formula whatever the size of the resonator, so the formula applies for parallelipipedic enclosures as well as parallelepipedic auditoriums (only the values frequencies are differents but not their progression). Comparisons with Louden's real measurements and classification of the best shapes of auditorium is excellent. Best regards from Paris, France JeanMichel Le Cléac'h Quote:
Last edited by Jmmlc; 6th December 2012 at 07:11 AM. 

6th December 2012, 10:17 AM  #55  
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Location: The Mountain, Framingham

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Clearly for the case of 1:1.5:2, the 2 to 1 dimensions will have every one of the short dimensions resonances coincident wth half of the long dimension's resonances. Not exactly the solution for optimum spacing. I've worked in the field of architectural acoustics. Unlike small room acoustics, nobody talks of room dimension ratios. Dimensions are relatively long and standing waves hence are dense and not a consideration. (i'd be happy to read a contrary reference if you can find one.) Room length and width are determined by audience considerations ( seat count, sight lines, legal requirements for exit rows, distance to stage) and then the ceiling is raised until he RT is to target. David 

6th December 2012, 10:52 AM  #56  
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Location: The Mountain, Framingham

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Getting a little absurd... David 

6th December 2012, 11:37 AM  #57  
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Hello Dave,
Sorry to have to say that but your question is a silly question, You have to think more about the problem... (think 1 degree of freedom... so it is obvious ration between dimension 1 and 3 is perfectly defined knowing the ratio D1/D2 and D2/D3...). From the point of view of resoannt frequencies, it doesn't matter if the room is elongated along x, y ou z... Best regards from Paris JeanMichel Le Cléac'h Quote:


6th December 2012, 11:48 AM  #58  
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Join Date: Nov 2009
Location: The Mountain, Framingham

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You do understand that, right? 

6th December 2012, 12:43 PM  #59  
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Location: in half space

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I can build two pine guitar cabinets of different dimensions that resonate noticeably, and one will be preferred to the other. They'll say it sounds "sweeter". It's known that some concert halls sound better than others, no? And they're not dead. I don't think it's just the RT60, I think content matters, as well. Granted, I'm talking euphonics on a hifi forum, and that's always thin ice. 

6th December 2012, 02:57 PM  #60  
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Location: The Mountain, Framingham

Quote:
Quote:
David 

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