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Old 30th January 2011, 02:28 PM   #1
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Default BiB Vs. iBiB

Hi everyone. I have a pair of Fostex Fe126En. On the net you can find many cabinet plans for Fe126 but TS parameters for the two kind of Fostex are quite different. In particular, Fs. Qts and Vas that are very important to build BiB and iBiB enclosure. I have two questions.

1. Is iBiB configuration really better than classic BiB?

2. If so, does anyone have plans for Fe126En? The one you can find is for 126E and, as said, this driver is different from En one.

Otherwise, if in your opinion Bib and iBiB are equivalent, I've no matters.

Thanks to all of you

Ziocalepino
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Old 30th January 2011, 05:26 PM   #2
2litre is offline 2litre  United States
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I too have a pair of the new FE126En's and was looking at building BiB's for them.

GM's (BiB_166_GM) BiB calculator found on Godzilla's website is an auto-calculator. Once you plug in Fs, Vas and Qts it will give you the dimensions.
Bigger Is Better 'BIB' Cabinet Dimensions - ZillaSpeak

Using the GM calculator I got a 42" tall cabinet with a z-driver position 16.5" down, resulting in a 25.5" floor to driver height.

The only plans I could find for an iBiB were in the box plan library of Planet10's website.
planet_10 hifi
It's called the iBiBk because it incorporates a Karlson Slot. It appears to be a working drawing though, not a finalized design.

The issue I had was when comparing the two pieces of information (the info given from GM's calculator using Fostex published T/S numbers) and the dimensions given in the iBiBk plan sheet, I saw some pretty significant differences. The height difference between the two is almost 10" and the driver position (z-driver) is totally different.

Since I have 8' ceilings and mine would be against a wall but not necessarily tucked into corners, I'm pretty sure an iBiB would load better in my room. The issues mentioned above though have so far kept me from building a pair.

R/
Jim
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Old 30th January 2011, 07:29 PM   #3
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I've made the same calculation and have compared results. For Fostex Fe127 the two plans ARE different, so unfortunately you cannot transpose results obtained with excel sheet for a BiB into am iBiB.

If someone has an analogue calculator, please share...

Thanks
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Old 30th January 2011, 07:44 PM   #4
Svein_B is offline Svein_B  Norway
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Quote:
Originally Posted by ziocalepino View Post
Hi everyone. I have a pair of Fostex Fe126En.
On the net you can find many cabinet plans for Fe126 but TS parameters for the two kind of Fostex are quite different.
I do not think they are that much different - not more than typical measured deviations from spec and between samples.

I therefore believe the same designs can be used.


SveinB
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Old 30th January 2011, 07:51 PM   #5
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Aside from the Fulmar slot, they're tuned somewhat differently, partly as a result of using measured specs. rather than the published ones. The realatively short inverted cabinet also allows the tap location of the driver to be shifted to one better suited for this configuration.
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Old 31st January 2011, 02:57 AM   #6
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>>> Since I have 8' ceilings and mine would be against a wall but not necessarily tucked into corners, I'm pretty sure an iBiB would load better in my room. The issues mentioned above though have so far kept me from building a pair.

Without being in corners my BIBs using fostex 165k or even the 168s (older style with whizzer) are bass light. Placing them into corners fills out the bass beautifully. It's quite an amazing transformation actually and rounds out the sound nicely. I would not build BIBs if they cannot be placed into corners as designed. Placed correctly, they ROCK, especially when considering they use pretty small full range drivers. They also deliver a BIG soundstage... they are great speakers for corner placement.

Zilla
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Old 31st January 2011, 03:36 AM   #7
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The iBIBk were drawn using the smaller of 2 suggested dimensions, before the calculator existed.

Real world testing of FE126e (n=200+) & FE126En (n=4)show them to have essentially the same T/S. (Fs & efficiency on FE126En fall in the top of the range for FE126e.

dave
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Old 31st January 2011, 07:12 AM   #8
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Well, 126E and 126En are very similar and plan works for both.

But what about a completely different driver? For example a Tang Band. After having made calculation for BiB, how con I proceed if I want to use them in an iBiB?

Thanks
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Old 31st January 2011, 07:37 AM   #9
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Invert & add a karlson slot... also lilely take advantage of the alternate (preferred IIRC) Zd

dave
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Old 31st January 2011, 10:30 AM   #10
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What do you mean with IIRC?

I've found on Karlson site few examples on how to draw this curve. What about its area? Starting from this data I can begin to calculate the shape.
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