bib calculator

[dudule25]

Hi
I want to make a BIB with 215rtf supravox. I am looking for bib calculator and i don't find it, the link is broken.
BIB Calculator - Bigger Is Better Loudspeaker Design
Is there a problem ?
Is there another link ?
Thank s

 

[planet10]

There is another link. Godzilla will need to check in to post it.

dave

 

[dudule25]

Thank s
Is there a metric bib calculator ?

 

[DanHat]

Martin King includes a BIB simulation in his excellent set of math cad spread sheets.

Quarter Wavelength Loudspeaker Design

 

[dudule25]

Can you tell if it's right

metric system non metric system

Fs Fs speaker Fs speaker
Vas Vas (liter) Vas (cu feet)=Vas (liter) *0.035315
Qts Qts Qts
Line lenght L(m)=C/2F=343.4/2F L(inch???)=13464.54/2F
Folded Height L(m)/2 L(inch)/2
Vb(???) Vb(unit???)=20Vas*Qt^1.25 Vb(unit???)=20Vas*Qt^1.25
Sm Sm=????? Sm=Vb*1728/B7 ?????????
Depth How do we calc Depht How do we calc Depht
Width widph=Sm/depth widph=Sm/depth
Z driver Z=line length*0.217
a b c depth/2 depth/2




What is Vb ?
What is Vb unit in metric system and in non metric system
How do we calc Sm in metric system ?
What is Sm unit in metric system and in non metric system
How do we calc Depht ?
Z driver what is 0.217 ?

Thank you for your help !!!

 

[zayne742]

I should still have the original excel spreadsheet that was on Godzillas's site. It did have a switch to change between metric and imperial. Please be patient and I will find it and post. Many others have asked for this sheet, and maybe it is time to put it back out there. Originally I had entered many of the common speakers people were using, however, that was quite some time ago and many of them are no longer available. That said, I will see if I can post a clean unlocked version. I will do my best to post this tomorrow evening.

 

[dudule25]

Great
Thank s a lot.

 

[GM]

It did have a switch to change between metric and imperial.

Interesting! I don't remember/have one with a 'switch', just one by O'Neil with a metric conversion column: http://www.diyaudio.com/forums/atta...90303-fostex-fe206e-bib-bib_166_gm_v2.xls.zip


GM

 

[dudule25]

Thank s a lot.

 

[Godzilla]

https://sites.google.com/site/speakerprojects/enclosures/bib

 

[zayne742]

Interesting! I don't remember/have one with a 'switch', just one by O'Neil with a metric conversion column: http://www.diyaudio.com/forums/atta...90303-fostex-fe206e-bib-bib_166_gm_v2.xls.zip


GM

You are correct! Your memory is better than mine. The one with the switch I could never get to work correctly.

Sorry for not getting back to this sooner, I will still try to unlock and clean up the file.

 

[zayne742]

Attached is a clean version of the BIB calculator. This will give you the ability to add all the drivers you want and save.

Enjoy!

 

[GM]

Thanks!

GM

 

[Godzilla]

https://sites.google.com/site/speakerprojects/enclosures/bib

I've added the 'clean' bib spreadsheet along with the one that's already populated with several examples. I hope it's helpful.

Zilla

 

[iperv]

Thank's for your work.

I'm planning to build a BIB enclousure to accomodate a pair of AN super 8 speakers, and another one to fit a pair of fostex fe103.

I would like to know if there is to dampening the internals.
Are they to be left clean?

EDIT:
I found this:

https://speakerprojects.wordpress.com/cabinet-types/bib-loudspeakers/bib-calculator/

Very good!
But...what about the double BiB?

 

[GM]

Stuffing wise, it's been a strictly by ear tweak for a typical pipe horn, though some have used MJK's software to get a starting point using polyfil. I use fiberglass insulation and for pipe horns I'd grab a handful of R-19 pink to stuff in the top and use 1" acoustic duct insulation [OC 703 IIRC] to line the horn all the way around the driver area and down to the bottom on one of the parallel sides with a diagonally positioned 'blanket' hanging down the back half of the horn to damp it in both planes.

For two drivers, double the Vas spec.

GM

 

[iperv]

Thank you for your suggestion.

My ask about the double BiB was about this:

 

[GM]

What about it? I don't recall anyone building it.

GM

 

[xrk971]

Akabak script for BIB

Here is an Akabak script for a BIB with a TC9FD. You can use it as a skeleton for other drivers by replacing the dimensions from the BIB calc spreadsheet into the geometry section, and adding T/S parameters for the driver of your choice. This script accounts for the effect of the 180 deg turn via four 45 deg turns (7 segments total), baffle edge diffraction, forward firing driver and upward firing horn mouth, and room wall reflections from back wall and floor (no ceiling). Copy the contents of the txt file and paste into a new script in Akabak.

 

[giantstairs]

Hello Iperv (???),
The double folded bib as you have drawn is not optimal as it will not load a ceiling with normal height. Better to make a 3rd fold and floor load. I have made 2 pairs and they work well although the driver height is a bit low. There are pictures in the big BIB thread.