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Old 28th May 2006, 08:49 PM   #761
fred76 is offline fred76  Philippines
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Default 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
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Old 29th May 2006, 05:36 PM   #762
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Right. You'll need to adjust the W x D dimensions to give you the required mouth area.
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Old 29th May 2006, 05:59 PM   #763
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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.
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Old 29th May 2006, 06:11 PM   #764
fred76 is offline fred76  Philippines
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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
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Old 29th May 2006, 06:27 PM   #765
fred76 is offline fred76  Philippines
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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
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Old 29th May 2006, 06:30 PM   #766
el`Ol is offline el`Ol  Germany
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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).
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Old 29th May 2006, 06:33 PM   #767
fred76 is offline fred76  Philippines
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Default 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
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Old 29th May 2006, 07:06 PM   #768
el`Ol is offline el`Ol  Germany
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Maybe a modification like this for small size drivers?
Attached Images
File Type: jpg bib.jpg (4.3 KB, 686 views)
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Old 29th May 2006, 08:42 PM   #769
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Default 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:

Click the image to open in full size.

(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
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Old 30th May 2006, 01:54 AM   #770
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Default take two

Picture didn't load . . . take two:

<DIV align=center>
<img src="http://gallery.AudioAsylum.com/cgi/gi.mpl?u=28081&f=RATSHACKBIBS.JPG" width=800 height=534>
</DIV>

thanks for the enclosure design

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