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Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks?
Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks?
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Old 30th June 2006, 07:15 PM   #931
Scottmoose is offline Scottmoose  United Kingdom
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I think Greg's done a couple of Lowthers about 30 pages back. It's about time I did one though, so here's one for your DX3s, using the parameters off the Single Driver site -the ones on Lowther's own site are worth about as much as the ink on a 1 note (removed from circulation 1985).

Line length 128in.
Zdriver 25.6in
Sm=118.25in^2

I want to know what these sound like, so get that saw fired up!

Best
Scott
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File Type: gif lowther dx3 bib.gif (6.5 KB, 718 views)
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Old 30th June 2006, 07:38 PM   #932
GM is offline GM  United States
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Greets!

#702.

GM
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Old 30th June 2006, 07:58 PM   #933
Scottmoose is offline Scottmoose  United Kingdom
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Thanks Greg. BTW, do you have a link to any accurate Lowther T/S parameters, aside from the one on the SDS, which looks about right -similar to those Martin sent me for his PM6Cs.
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Old 30th June 2006, 08:00 PM   #934
dhenryp is offline dhenryp  United States
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Quote:
Originally posted by Bing Yang
I know there has been discussions on using Tang Band W4-1320 in BIB. If I want to put two drivers in the design to get higher SPL, what would be the changes in the dimensions of the design?

You could make a BiB bipole. I think the the attached approach would work.

The first is just two standard BiBs back to back with the common wall removed.

The second merges two unequal length BiBs. This could have the advantage of having the peaks in one BiB filling in the valleys of the other. It would take some simulations to find the right combinations of lengths to do this.

This is just an idea, I've not built it.
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Old 30th June 2006, 08:02 PM   #935
Scottmoose is offline Scottmoose  United Kingdom
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Only trouble with that is, these things are designed for near wall / corner placement to achieve their 1/4 - 1/8 space loading. Bipoles by nature tend to like being pulled out, well away from walls. That's why I didn't suggest one. Nothing's impossible of course though.
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Old 30th June 2006, 08:08 PM   #936
Scottmoose is offline Scottmoose  United Kingdom
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Here's Greg's cabinet for the DX3, DX4 & C45 as it doesn't have a plot to go with it.

Line length 120in
Zdriver 25.2in
Sm=220in^2
4ohms series resistance.

I used the same T/S parameters off the SDS for the DX3 for the purpose of the model. Nice response.
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File Type: gif gm dx bib.gif (6.4 KB, 722 views)
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Old 30th June 2006, 08:09 PM   #937
GM is offline GM  United States
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Greets!

You're welcome!

I use the ones MJK published in his Lowther section since the few others I have are 'close enough' to his.

GM
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Old 30th June 2006, 08:26 PM   #938
Scottmoose is offline Scottmoose  United Kingdom
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Many thanks as always Greg, why it didn't occur to me to use those on Martin's site I don't know. I must be loosing it.

Here's a plot for Greg's DX2 cabinet:

Line length 138in
Zdriver 30in
Sm=220in
2 ohm series resistance

On a different note, for general interest, if anyone likes some of the now unavailable books on audio -particularly amps, but other stuff too, have a look here: http://www.pmillett.com/tecnical_books_online.htm
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File Type: gif gm dx2 bib.gif (6.6 KB, 695 views)
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Old 1st July 2006, 09:15 AM   #939
Samuel Jayaraj is offline Samuel Jayaraj  India
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Scott, thanks very much for providing the BIB dimensions I requested for. Time to get going builing these.
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Old 1st July 2006, 09:51 AM   #940
Samuel Jayaraj is offline Samuel Jayaraj  India
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Just one more question with regard to the BIB dimensions for the Fostex 168EZ Sigma.

Using the Excel sheet provided by GM, I get H=64", D=10.299" & W=7.210".

However, Ray Collins who has already constructed his BIB for the same driver used H=64", D=11.00" & W=6.75".

Which of the above is the most optimal dimensions? My guess is the one provided by GM's worksheet.
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