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Old 8th April 2013, 05:59 PM   #1
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Default Just found the BIB design

I just found Terry Cain's BIB design. While I've found a ton of information, most of it references zillaaudio.com, which seems to be dead links.

Am I correct that this is a TQWT designed to be 1/2 wavelength instead of the standard 1/4?

If so, does that mean there is an opening? That would make sense, but most of the designs look like there isn't one.

Where is the driver placed? Is it the standard TQWT 1/3" the length of the pipe? Is the only reason to do an inverted BIB to place the driver closer to ear level?
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Old 8th April 2013, 07:40 PM   #2
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yes there is an opening.... usually on top, inverted to bring it down, cover the dust trap
I had the original, opening on top, and found the driver in good height (fostex 6 inch)

Danny
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Old 8th April 2013, 09:01 PM   #3
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There's 105 pages of discussion on the BIB here:
Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks?
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Old 8th April 2013, 09:19 PM   #4
xrk971 is online now xrk971  United States
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There is a nice Excel spreadsheet BIB calculator buried in there somewhere by GM.
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Old 8th April 2013, 11:50 PM   #5
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Quote:
Originally Posted by xrk971 View Post
There is a nice Excel spreadsheet BIB calculator buried in there somewhere by GM.
It is on the page that is sadly now only broken links.
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Old 8th April 2013, 11:59 PM   #6
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Quote:
Originally Posted by Don Hills View Post
An excellent thread for someone familiar with Bib, but actually contains little information on what the difference is between a BIB and a TQWT that is twice as long as normal.
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Old 9th April 2013, 02:52 AM   #7
zman01 is offline zman01  Bangladesh
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Default BIB Calculator

Refer to post #21 to download the BiB calculator:

Enclosures for Hemptone FR8
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Old 9th April 2013, 03:45 AM   #8
GM is offline GM  United States
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The original BIB is indeed a 1/2 WL pipe horn with the driver off set 21.7%, though of course it doesn't have to be a 1/2 WL of the driver's Fs if you want it longer or shorter for whatever reason.

GM
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File Type: gif BIB Layout.gif (29.5 KB, 1020 views)
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Old 9th April 2013, 04:27 AM   #9
xrk971 is online now xrk971  United States
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Default GM's BIB Calculator - re-posted

Quote:
Originally Posted by bvbellomo View Post
It is on the page that is sadly now only broken links.
In that case, I will re-post GM's excellent spreadsheet here for you.
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File Type: zip Copy of BIB_Calculator_V1-2.zip (11.8 KB, 176 views)
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Old 9th April 2013, 11:47 AM   #10
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Thanks to those who helped me get the spreadsheet. Maybe others will find it here since it isn't online at zillaaudio anymore.

Is the entire 'terminus' area supposed to be open on top? What if I invert this design?

The reason for looking at this design is that I wanted to minimize space taken up by surround speakers (WAF) but need to raise the drivers up off the floor (no stands, behind a couch). The "Z Driver" puts this almost in the center vertically, but I want it on top. Maybe I can play with the way this is folded.

The spreadsheet calculates the "Z Driver" as 0.217 * the unfolded length. Does anyone know the reason .217 was chosen? This seems like an arbitrary number.
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