Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 77 - diyAudio
 Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks?
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 28th May 2006, 08:49 PM #761 diyAudio Member   Join Date: Jan 2005 Location: Manila fred76 Hi GM, Ah, by 'Stock' do you mean use TC's Original BIB dims for enclosure height (~70") and driver's height from floor (~39"), except for the 220"^2 Sm?? Thanks for the sim response plot! fred
 29th May 2006, 05:36 PM #762 diyAudio Member     Join Date: Mar 2005 Location: UK Right. You'll need to adjust the W x D dimensions to give you the required mouth area. __________________ "'That'll do", comes the cry of the perfectionist down the ages.' James May -The Reassembler www.wodendesign.com Community sites www.frugal-horn.com http://frugal-phile.com/
 29th May 2006, 05:59 PM #763 diyAudio Member   Join Date: Feb 2004 Location: Appleton, WI After all this time the only thing I'm really sure about is half of line length equals height. Is there a conversion formula to input some widths and depths? Could this be formalized at How to Build a BIB? And keep it in inches. That would mean a way to read out a=b=c measurement as a product of depth. Also there seems to be some variation on line length being the apex of c at b or to the bottom of the cab.
 29th May 2006, 06:11 PM #764 diyAudio Member   Join Date: Jan 2005 Location: Manila Thanks Scott... So for the 7x, an example would be: WxD = 11" x 20" Zdriver = ~31" BIB Height = ~72" D/2 = 5" *would be less when interal baffle thickness is taken into account* fred
 29th May 2006, 06:27 PM #765 diyAudio Member   Join Date: Jan 2005 Location: Manila Hi loninappleton, I think the A=B=C or Depth/2 was always kept in inches. Half the Line Length = BIB Height is a good approximation. If you want it a lil bit more accuracy you can use the .xls spreadsheet attached by someone here some pages back. BTW, WxD = Sm. fred
 29th May 2006, 06:30 PM #766 diyAudio Member   Join Date: May 2005 Location: Bavarian Forest A question to the audience: What is the highest Fs and lowest Sd that has worked, yet? I don`t have the TQWT and BLH mathcad sheets, but my hornresp calculations indicate the 13cm Altec-Lansing (see http://www.spectrumaudio.de for specs) could work (length clearly more than half wavelength of Fs).
 29th May 2006, 06:33 PM #767 diyAudio Member   Join Date: Jan 2005 Location: Manila Fe103e/107e... Anyone here tried the 103E/107E BIB with good results by lining stuffing experiments w/out using an extra base to increase baffle height (for better room loading)? Thanks... *edit - I just realized that the extra base is also needed for "driver ear height" when listening. So nevermind on the 'w/out' query. Anyways, any subjective feedback on the 103E/107E BIB for those who built 'em is still very much appreciated. Thanks. fred
diyAudio Member

Join Date: May 2005
Location: Bavarian Forest
Maybe a modification like this for small size drivers?
Attached Images
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 29th May 2006, 08:42 PM #769 diyAudio Member   Join Date: Sep 2005 Initial Radio Shack 40-1285D BIB plans . . . . So I drafted up GM's BIB spec's for the radio shack 40-1285D 6.5 inch, and I think it will look pretty good. I'm going to try and make a detachable speaker mounting plate on the front to allow me to swap in other drivers. I'm curious to see how some of my OEM Console speakers (6 - 8") can sound in a BIB. Take a look at the draft: (hope the image isn't too big . . .) I figured I can build them with only 4 4X8 sheets of good birch 3/4 inch plywood. Any suggestions or comments welcome
 30th May 2006, 01:54 AM #770 diyAudio Member   Join Date: Sep 2005 take two Picture didn't load . . . take two:
thanks for the enclosure design

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