Hi, try this site
http://www.quarter-wave.com
I have been using Martins calculation for a while now and the results are remarkable.
Regards
http://www.quarter-wave.com
I have been using Martins calculation for a while now and the results are remarkable.
Regards
Yeah, I've been there but I'm still confused on where to start. I just need some plans. I found some for a BIB transmission line for the Pioneer driver but I don't know how to start it out. The height and width will be 10" x 20" ( the Sm is 200 square inches so I just went with 10" x 20") I just don't know how tall to make the enclosure though The line length is 138"
http://www.zillaspeak.com/bib-pioneer.asp
There is the link to it.
http://www.zillaspeak.com/bib-pioneer.asp
There is the link to it.
Hi... "The line length is 138"
Imagine the BIB without the center baffle. Just a tall tapered ‘triangular shape’… the BIB is basically this ‘triangular shape’ folded in half.
http://www.zillaspeak.com/bib-howtobuild.asp
In the case of the PioneerB20, the line length is 138 inches. That means the total length of the cabinet unfolded is 138”… by folding it in half you still have a line length of 138” but the actual cabinet inner dims is half, or 69 inches.
You simply halve the line length. Does that make sense?
Godzilla
PS. Yeah 69!
Imagine the BIB without the center baffle. Just a tall tapered ‘triangular shape’… the BIB is basically this ‘triangular shape’ folded in half.
http://www.zillaspeak.com/bib-howtobuild.asp
In the case of the PioneerB20, the line length is 138 inches. That means the total length of the cabinet unfolded is 138”… by folding it in half you still have a line length of 138” but the actual cabinet inner dims is half, or 69 inches.
You simply halve the line length. Does that make sense?
Godzilla
PS. Yeah 69!
Yeah, I got it all sketched up, L=138". Center of speaker 30" down from the top of the enclosure. The thing is, I didn't know if was supposed to make the inside board 69" long. It makes sense now that I think about it. So now the box will be around 79" tall if the inside piece is 10" from the bottom of the enclosure (a=b=c=depth/2) But is it okay that the width and depth is 10"x20"?
visit http://www.zillaspeak.com/bib-howtobuild.asp - there's enough and more information there.
Godzilla actually told you it would be 69" tall internal.
Pioneer B20FU20-51FW 8" full range
L = (Line length) 138"
So = Driver 30" down from sealed end of cabinet
Sm = 200"^2
All internal
That means you halve L to get cabinet hight = 69"
Sm is mouth volume or your foot print. I'd suggest using the golden ration 1.618. Then you get out your calculator and plug in numbers to find the other dimensions. 11" x 18" = 198"^2
You can choose those dimensions or come up with your own and more accurate or larger dimension.
Once there you you your internal volume and all internal dimentions. 69" x 11" x 18" .
Last thing to do is to find the length of the internal taper baffle. I'm not going to figure that out, that takes a bit more math, but is not diffucult. My suggestion would be to draw out your plans to scale.
Josh
Pioneer B20FU20-51FW 8" full range
L = (Line length) 138"
So = Driver 30" down from sealed end of cabinet
Sm = 200"^2
All internal
That means you halve L to get cabinet hight = 69"
Sm is mouth volume or your foot print. I'd suggest using the golden ration 1.618. Then you get out your calculator and plug in numbers to find the other dimensions. 11" x 18" = 198"^2
You can choose those dimensions or come up with your own and more accurate or larger dimension.
Once there you you your internal volume and all internal dimentions. 69" x 11" x 18" .
Last thing to do is to find the length of the internal taper baffle. I'm not going to figure that out, that takes a bit more math, but is not diffucult. My suggestion would be to draw out your plans to scale.
Josh
edjosh23 said:Sm is mouth volume or your foot print. I'd suggest using the golden ration 1.618. Then you get out your calculator and plug in numbers to find the other dimensions. 11" x 18" = 198"^2
You can choose those dimensions or come up with your own and more accurate or larger dimension.
Greets!
http://www.diyaudio.com/forums/showthread.php?postid=942572#post942572
http://www.diyaudio.com/forums/showthread.php?postid=943832#post943832
http://www.diyaudio.com/forums/showthread.php?postid=945770#post945770
GM
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