here's my new OB calculator :)
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 10th November 2004, 02:40 AM #1 hitsware diyAudio Member   Join Date: Mar 2002 here's my new OB calculator :)
Dave Jones
diyAudio Member

Join Date: Jul 2003
Location: Silicon Valley
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?
__________________
Davy Jones

hitsware
diyAudio Member

Join Date: Mar 2002
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.................

 10th November 2004, 05:48 PM #4 markp   diyAudio Member   Join Date: Oct 2003 Location: L.A., CA A little more explaination would help. What are the columns and what is dia of? __________________ If it sounds good... it is good!
hitsware
diyAudio Member

Join Date: Mar 2002
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.................

 11th November 2004, 04:03 PM #6 Kittle   diyAudio Member   Join Date: Jun 2004 Location: KC What measurement units are you using? inches? feet? cm? meters?
hitsware
diyAudio Member

Join Date: Mar 2002
Quote:
 Originally posted by Kittle What measurement units are you using? inches? feet? cm? meters?
feet

 11th November 2004, 07:33 PM #8 markp   diyAudio Member   Join Date: Oct 2003 Location: L.A., CA 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.... __________________ If it sounds good... it is good!
hitsware
diyAudio Member

Join Date: Mar 2002
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...........

 12th November 2004, 01:09 PM #10 Gregm   diyAudio Member   Join Date: May 2003 Location: Wherever I leave my hat 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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