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Old 3rd February 2011, 12:48 PM   #1
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Default questions about shortened BIB fe206e

Hi from Argentina, I have a couple of questions, I want to build the shortened BIB with fostex fe206e and I'm confuzed about the internal measures. Running the BIB Calculator I obtain the following:

depth 12,54 inchs. 31,86 cm

width 8,87 inchs. 22,53 cm

Corrected Height + internal base 72,19 inch 178,12 cm

Corrected Z-Driver 28,59 inch 72,62 cm

are this data correct?

I must add to the depth the thicknes of the internal diagonal pannel?

I don't understand the utility of the "semicircle radius" semicircle length" and "difference from
original line" data, have this data any utility in the building?

No more by now, Thanks in advance and excuse my poor english
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Old 4th February 2011, 06:08 PM   #2
GM is offline GM  United States
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Greets!

There is more than one BIB calculator and do not know which one you used, but this type of cab alignment does not require a high degree of dimensional accuracy, so using my own calculator:

W = 8.89"
D = 12.56"
H = 70"
A-B-C = 6.278"
zdriver = 30.38"

All dimensions are internal and approximate and not far off from yours enough to be audible.

Using this W x D ratio, I see no need to add the divider board thickness to 'D', but you can if you want.

Note that this design assumes the published specs are accurate (which I doubt) and an insignificant amount of series resistance is used, so if either is off much, the net cab volume (Vb) will be too small, possibly sounding under-damped, requiring much more stuffing than normal to smooth it out, so you might want to consider increasing Qts at least to 0.3 and using these larger W x D, A-B-C dimensions.

I have no idea what the rest is about, maybe Godzilla or someone else will enlighten us.

Regardless, good luck with it and let us know how it turns out and what all you did to get them to perform well, or not.

GM
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Old 5th February 2011, 12:46 PM   #3
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Thank You a lot GM! very usefull data, I'll start the construction soon
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Old 5th February 2011, 02:24 PM   #4
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Bigger Is Better 'BIB' Cabinet Dimensions - ZillaSpeak

The shortened BIB for the 206e as shown on the site calls for larger inner dims. I should put a note at the top of the page that these are older suggested designs that that work but to check the latest calculator for additional results.

BIB Calculator - Bigger Is Better Loudspeaker Design

Personally, my BIBs using 165k are in cabs better optimized for the 168s.

Enjoy building your BIBs!
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Old 6th February 2011, 04:58 AM   #5
minhaj is offline minhaj  Bangladesh
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Pls checkhttp://diyaudioprojects.com/Drivers/FE206E/ where Qts is.24, Vas is 79.9L and Fs is 39hz.

GM and Zilla
I will build my BIB with 206 next week. What should I consider Fostex spec or the above spec. Pls advise.

Regards
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Old 6th February 2011, 06:19 AM   #6
GM is offline GM  United States
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Quote:
Originally Posted by minhaj View Post
What should I consider Fostex spec or the above spec.
As I previously noted, raising Qts to at least 0.3 to do the calculations is a good plan to ~cover these types of variables when one doesn't measure their own drivers since I've some others measured specs that sims an even larger cab than these, so your call as to which to use.

GM
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Old 6th February 2011, 08:37 AM   #7
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thanks for your help GM, Godzilla, Minhaj.
the BIB for my fe206e turn bigger and bigger in every post! I start thinking in Dallas 2 or sachikos or vofos (or Curvy Chang with 4 ohms resistor)
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