Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 509 - diyAudio
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Old 20th December 2012, 04:45 AM   #5081
GM is offline GM  United States
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Don't know, I've always had to find it empirically, though I do have some math to figure a starting point that may work well enough.

What is the mouth size [Sm]?

GM
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Old 21st December 2012, 03:53 PM   #5082
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OfficeMax File Crate, Black

I don't think 2 or 3 inches will be enough to appreciate the full benefits of the BIBs opening. Tho I haven't done it, I've always wondered how an inverted BIB would sound on top of one of these plastic file crates?

Zilla
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Old 21st December 2012, 04:41 PM   #5083
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Yeah, to keep from audibly mass loading it, I calc a ~13.59" gap for TC's 55"^2 Sm, though for these smaller BIBs, mass loading them is probably a good plan. For sure, a local DIYer's 'little' FE126E? BIB performed much better overall with just a 'by ear' gap of around 1.25" sitting on a desk Vs sitting on the floor [mouth up] hard up against a wall/desk to get a small amount of corner loading.

WRT the crate as platform, it works for me! This was an integral part of the early [ML]TLs I made for many of my peers for back when we all lived in either small bungalows, apartments or dorm rooms. They blended quite well with the 'el cheapo' pine plank/concrete block shelving, wood peach crate album/misc. containers and macrame hangers to isolate our TTs.

GM
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Old 21st December 2012, 11:15 PM   #5084
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Quote:
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Don't know, I've always had to find it empirically, though I do have some math to figure a starting point that may work well enough.

What is the mouth size [Sm]?

GM
Thanks again GM. The mouth opening will be 6" X 8". I figure about 30856mm^2.

Is that the measurement you need?

JH
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Old 22nd December 2012, 01:12 AM   #5085
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You're welcome! Yes, start with ~10.375".

GM
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Old 7th January 2013, 03:00 AM   #5086
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Default Vifa 18-08 BIBs

Here is the BIB I made recently. Sound really good firing up.

In another forum, I saw speakers wrapped in cloth. Thought that burlap would look nice. I'm not to pleased with the trim. Had to use fake oak trim as Home Depot did not have real wood trim in outside corner pieces.

Drivers are Vifa 3 1/2 inch, 18-08.

JH
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Old 7th January 2013, 04:12 AM   #5087
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That's wild looking! Have you tried it down-firing, spaced at ~10.375"?

GM
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Old 7th January 2013, 04:24 AM   #5088
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Quote:
Originally Posted by jhutka View Post
Here is the BIB I made recently. Sound really good firing up.

In another forum, I saw speakers wrapped in cloth. Thought that burlap would look nice. I'm not to pleased with the trim. Had to use fake oak trim as Home Depot did not have real wood trim in outside corner pieces.

Drivers are Vifa 3 1/2 inch, 18-08.

JH
Can you provide dimensions of your BIB? That is my favorite driver. I just built a FH3 inspired horn with the Vifa and it sounds really good. I like the whole cloth cover idea. Matching with drapes or sofa is one way to get more WAF.
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Old 7th January 2013, 03:21 PM   #5089
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Hi xrk,

Thanks to GM, There is a BIB Calculator on post #5017 on this thread. (Excel)

JH
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Old 7th January 2013, 03:40 PM   #5090
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GM,

Haven't tried down firing yet. Have some old milk crates in the garage.(Thanks Godzilla)

If they work, I'll post.

JH
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