Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 26 - diyAudio
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Old 1st April 2006, 06:08 PM   #251
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Yes to both, though they'll need shorter boxes than the original obviously. I'll run a few numbers later and get back to you. Unless Greg beats me to if first... ;-)

Cheers
Scott
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Old 2nd April 2006, 08:49 PM   #252
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Here's some dims for the 108ESigma.

88in line length. Driver down 17.5in from So. 33in^3 mouth area. F3 of circa 50Hz. Not bad for one of these little things.

Best
Scott
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Old 2nd April 2006, 09:58 PM   #253
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Quote:
Originally posted by Scottmoose
Here's some dims for the 108ESigma.

88in line length. Driver down 17.5in from So. 33in^3 mouth area. F3 of circa 50Hz. Not bad for one of these little things.
I've been lurking on this thread thinking to build a prototype with some 108EZ's I happen to have already. But now I'm confused.

I don't know how to interpret a mouth area in cubic inches. How far down do you measure? What would be the dimensions of the footprint? And how high would the inner baffle be from the bottom?

If I'm interpreting these numbers right, with the fold, the cab would only be 44-45 in high, and the driver would only be 27 in off the floor. The top would be too far from the ceiling to get optimal room gain.

So now I'm wondering whether it's worth it. You could put the whole thing on a stand, but then the driver would be too high off the floor. Why not then just build a tapered half wave TL instead (unfolding the whole thing), with the mouth facing down and coupling with the floor instead of the ceiling?

Randy
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Old 3rd April 2006, 12:49 PM   #254
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Sorry Randy -typo on my part. It should have read square inches.

You don't have to fold it -you could just have a tall, straight column. Remember too that it's also the rear boundary conditions that do much of the work, not the ceiling per se alone, so the folded one will still work. Not quite as effective as the tall jobbies, or an unfolded version, but the 1/2 space sim doesn't look terrible. Shoved against a rear wall or in corners, it should work pretty well. The inner baffle terminates in the centre of the cabinet, the same distance from the floor as from the front and rear baffle inner-walls. I purposfully left that out as people might want to experiment with different width / depth dimensions (keeping the mouth area the same). Try, say, 4.5in wide x 7.5in deep internal for Sm.

Best
Scott
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Old 4th April 2006, 07:44 AM   #255
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Default the fx 120.

the cabinets i made are using the design reccommended by scottmoose. it was for 50 inch height, 7 inch width, 5.5 internal baffle 39 inch driver height. I will be giving these to a freind for parts cost.

they are freakin amazing. there is no lack in low frequency. perhaps even too much of almost all low frequencies, but considering that it is horn bass, this is never a bad thing... there is a little trough somewhere around 100 hz as predicted. i don't really care though. disadvantages? well, they need alot of power. they usually give my PP el84 amp a run for its money.

i have a pair of 166 es-rs that i am thinking of building a cabinet in this style for. i wonder if it is reccomended to build the cabinet of same dimentions as for 168 eZ or 168 es???

the measurements posted on zilla speak.com?

well, there will be pictures posted soon.

thanks a ton y'all, and especially to terry.

Clark
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Old 4th April 2006, 10:09 AM   #256
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Default fe108e sigma

scott -- thanks for running those numbers!

randy -- have you decided what you will do?

with the compromise in height (in the folded) how would the fe108e in BIB compete with the buschhorns using the same drivers? it will not be possible for me to build the unfolded version and i have never heard a full range speaker so it is hard for me to imagine how any of them sound.

alternatively, would another 4", the fe103 for example, sound better in the BIB?

and as for the beymas, will they also need a short line length? they will be going in an open baffle today or tomorrow but i don't expect there will be much or any bass for that matter.

cheers!
larry
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Old 4th April 2006, 03:34 PM   #257
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Hi all!

Scott has generously provided sims and dims for several drivers requested (103/107, 108, 126/127, 166, 167, 168, etc… I will post them on the site before week end.

Right now I am still trying to depict a proper graphic showing the basic build/shape of a BIB cabinet. Have a look… tho I understand some clarification is needed. I will fix soon.

http://www.zillaspeak.com/BIB.asp

All current dims are NOT correct at this time. Please be patient and I will have them up so everyone can build a proper BIB. I am curious to build a pair to hear how it handles the bass frequencies…

Godzilla
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Old 4th April 2006, 04:28 PM   #258
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Hi

I once made this little photoshop drawing to get a better idea of the dimensions for the Hemp 8 BIB...

Click the image to open in full size.

Quite an impressive box, isn't it!

Zilla, if you like it feel free to use it for your BIB page - 's all I can donate as I decided against building it...

LC
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Old 4th April 2006, 04:54 PM   #259
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I will use that image somehow LC! Thanks... it looks really cool... What dims did you use? I will include it along with the Hemp dims.

Does the figure in the background represent you?
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Old 4th April 2006, 04:54 PM   #260
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I'm back to the idea of putting the 108ES into a BIB. The alternative is the Fostex recommended BLH, which seems like a lot more work and is less adventurous.

If I unfolded it, as a half-wave TL, the driver would be too far off the floor. Folded, of course, the driver is too low, but I could build the cab a foot and a half deeper and fill the bottom compartment with sand (or a subwoofer).

Zilla, great page with very clear graphics! One small suggestion: if you located the driver vertically with the measurement to the bottom (instead of the top of the cab), then we wouldn't have to do the head math to see how far the driver is from the floor (usually a more critical measurement in the design).

lovechild, is that Courbousier's six-foot tall Englishman waving at us?

Randy
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