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Old 10th November 2004, 01:40 AM   #1
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Default here's my new OB calculator :)

http://home.comcast.net/~jhyamamoto/3ob3.xls
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Old 10th November 2004, 04:46 AM   #2
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Default Re: here's my new OB calculator :)

Quote:
Originally posted by hitsware
http://home.comcast.net/~jhyamamoto/3ob3.xls

Care to give us a hint as to what it does?
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Old 10th November 2004, 02:39 PM   #3
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Default Re: Re: here's my new OB calculator :)

Quote:
Originally posted by Dave Jones



Care to give us a hint as to what it does?
After determining Fc (the freqency of the first order HP filter imposed by the baffle) one can take a chosen driver and (with a sealed box calculator (put the driver in an infinite baffle)), add the filter and thus approximate the system response.................
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Old 10th November 2004, 04:48 PM   #4
markp is offline markp  United States
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A little more explaination would help. What are the columns and what is dia of?
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Old 11th November 2004, 12:26 AM   #5
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Quote:
Originally posted by markp
A little more explaination would help. What are the columns and what is dia of?
space/1=in a tree
space/2=on the ground
space/4=on the ground near a wall
space/8=on the ground near a corner

height and width are the dimensions of a rectangular baffle
diameter is the diameter of a circle with the same area as the rectangle.................
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Old 11th November 2004, 03:03 PM   #6
Kittle is offline Kittle  United States
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What measurement units are you using?
inches? feet? cm? meters?
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Old 11th November 2004, 03:15 PM   #7
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Quote:
Originally posted by Kittle
What measurement units are you using?
inches? feet? cm? meters?
feet
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Old 11th November 2004, 06:33 PM   #8
markp is offline markp  United States
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I think that there is more to it than that. The baffle can't just be converted to a round surface of uniform radius. The long axis will support lower freqs than the short axis etc....
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Old 11th November 2004, 10:33 PM   #9
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Quote:
Originally posted by markp
I think that there is more to it than that. The baffle can't just be converted to a round surface of uniform radius. The long axis will support lower freqs than the short axis etc....
Intuitively I agree. However I have gleaned this approach from people who's knowledge I trust. Also it seems to be (empirically)
usable (within limits). A safer method would perhaps be to use the shortest dimension only (but perhaps too safe). This is in fact the same formula used to size the mouth of a horn. Obviously a mouth 1' x 9' is not going to act like a mouth 3' x 3', but perhaps if the ratio is kept reasonable all is well...........
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Old 12th November 2004, 12:09 PM   #10
Gregm is offline Gregm  Europe
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At the Fb calculation you have a constant "565". How do you get that?

I'm trying to convert the functions into metres/centimetres
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