Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 69 - diyAudio
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Old 18th May 2006, 04:47 PM   #681
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Quote:
1) Turning the mouth to the vertical by "sliding" it to be in the front. This would shorten the box slightly.
I thought the magic of the BIB was the the way it loaded the wall and ceiling.

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Old 18th May 2006, 05:22 PM   #682
dmason is offline dmason  United States
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It is.
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Old 18th May 2006, 05:36 PM   #683
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Agreed.

It'd also need to be a hell of a big mouth. The BIB's open top is actually a terminus, as Greg pointed out to me in a private email, the mouth is actually formed by the room corner. So, the forward venting types, if they otherwise follow the BIB layout, will nominally require an eightfold increase in mouth area to gain similar performance. OK, so the other room factors come into play here, but you get the idea. Front horn mouth = fine, but not linked only to an otherwise unaltered BIB layout.
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Old 18th May 2006, 05:45 PM   #684
croat47 is offline croat47  United States
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I think I actually conceded the ceiling propagation concern twice . In the end, I am more fascinated by the BIB and just mildly curious what the guts of the Acuhorn may consist of.

Has anyone built the CSS BIB's?

Regards.
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Old 18th May 2006, 06:11 PM   #685
GM is offline GM  United States
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Quote:
Originally posted by zek


...and how to get rid of this dip around 120Hz and zig-zag in upper region.
Greets!

Eliminating the dip requires either the driver be placed much further down the pipe or a separate tuned resonant pipe be added, both of which go beyond the scope of this thread.

The 'zig-zag' can be damped by stuffing the pipe, but the trade-off is you lose all of the pipe's gain, winding up with a low tuned classic TL.

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Old 18th May 2006, 09:48 PM   #686
hlj is offline hlj  United Kingdom
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QUOTE]The BIB's open top is actually a terminus, as Greg pointed out to me in a private email, the mouth is actually formed by the room corner.[/QUOTE]

Hi Does this mean if the BIB concept is maintained and the terminus is still uppermost, the bi-folded version (see bibib.jpg) I am experimenting with will still "load" the corner even if shorter than the original? Thx.
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Old 18th May 2006, 10:02 PM   #687
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Quote:
Originally posted by hlj
QUOTE]The BIB's open top is actually a terminus, as Greg pointed out to me in a private email, the mouth is actually formed by the room corner.


Hi Does this mean if the BIB concept is maintained and the terminus is still uppermost, the bi-folded version (see bibib.jpg) I am experimenting with will still "load" the corner even if shorter than the original? Thx.
[/QUOTE]


Wait for the experts to answer here, but my take
on it is that the wall corner acts like nelson Pass's
'kleinhorn'. That's my best way to visualize it.
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Old 18th May 2006, 10:40 PM   #688
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To piggyback the question further for the "experts"...

What is the minimum distance between the top of the horn and ceiling required for proper loading/creation of the horn mouth? Is there some relation to the size of the BiB terminus?

And, if the BiB is too short, what would the effect be by inverting and using the bottom corner of the room to complete the mouth (assuming the minimum distance does not change)? Perhaps, use some sort of "reflector" on bottom to difuse/low pass the output...

Thanks.
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Old 19th May 2006, 12:10 AM   #689
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Quote:
Originally posted by croat47


Has anyone built the CSS BIB's?


Yup.
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Old 19th May 2006, 01:07 AM   #690
croat47 is offline croat47  United States
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Quote:
Originally posted by lousymusician



Yup.
Very nice, In the context of the current questions: how do they sound? They are the shorter of the designs, any propagation issues?
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