Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 467 - diyAudio
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Old 27th May 2010, 05:42 PM   #4661
croat47 is offline croat47  United States
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Missed that consideration! The simple radius shapes' area (both sides combined) is larger than the mouth's area. In the case of the right side, the area is slightly reduced. Does this add a mass loading effect?

In any case, opening up all sides with the split radius would beat the area.


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Old 27th May 2010, 06:05 PM   #4662
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Glad there's some activity back in this thread for Terry.

I'll be interested to see how something small as a BS3 can actually perform for a BIB.
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Old 27th May 2010, 06:22 PM   #4663
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Regarding the total length of the BIB, please have into account that you should consider the terminus to be not the floor but the highest point of any opening you decide to do...
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Old 27th May 2010, 08:36 PM   #4664
croat47 is offline croat47  United States
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ghpicard,

Yes. The top of the openings shown is at where a standard non-inverted BIB mouth would end. I am just trying to raise the driver height by extending the front and back baffles, then cutting out a portion of the sides...effectively making legs.

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Old 23rd July 2010, 02:26 AM   #4665
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Default A BIB for the CHR-70 from Mark Audio

Greetings to all BIB enthusiasts old and new.

I have not run the BIB calculator to compare the output from the calc of thr CHR-70 from Mark Audio with the BIBs I have for the FE127e. Has anyone done this?

I ask because I tend to be "all thumbs" with input for software. My BIBs were carefully measured for the Fostex and so I'm thinking of a drop in solution to see what the enthusiasm for Mark Audio and the CHR-70 is about. The fact Madisound now carries the line and I can order locally is also an influence.

If no replies I will post back after I do the data entry.
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Old 23rd July 2010, 02:45 AM   #4666
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Well It turns out I did the CHR some time back but the current product shows some slightly different numbers. Line length difference is 5 in. and the volume of the CHR-70 box would be a bit smaller. An inch and half difference at A-B-C I could live with. Big test is if the CHR-70 gives that nice satisfying ring of chords played low register on piano.
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Old 15th September 2010, 10:57 PM   #4667
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Default Folding other than at .5 line length

Hi,

I've probably read the entire thread more than once, in total, but always in chunks over time, so maybe I missed the info. Is it workable to fold the line other than at the midpoint? For example, to raise the driver height in a short iBIB, could the fold be at .35 of line length? The internal baffle would become a sloping front (i.e., external) for the bottom of the cabinet.

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Old 15th September 2010, 11:20 PM   #4668
GM is offline GM  United States
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Like any horn, you ideally want the flare to be preserved or at least not contracting, so you can fold it up into a pretzel if you want if these guidelines are followed. The problem with short horns though is one of getting adequate boundary loading, so if too short to load the ceiling, then it needs a rigid, well damped wall or floor (non-floating) to load against and maybe even a restrictive mouth plug or reverse cone section added to it to mass load it a bit.

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Old 16th September 2010, 12:38 AM   #4669
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Smile Thanks GM!

Right, looking to floor load it and I recall your earlier comments about a pyramidal shaped plug inserted to taste. Time to experiemnt.

bearberry
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Old 6th October 2010, 05:57 AM   #4670
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Ive read through the entire post. Horray for me and my newly won knowledge
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