Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 28 - diyAudio
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Old 4th April 2006, 10:42 PM   #271
dmason is offline dmason  United States
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"WIll it play in Peoria?"

That is exactly why I think a 6 & 8 with some flavors of Q mid and higher are highly versatile.

I am glad of it that he is very interested in listening. Very much looking forward to a power speaker with these cones.
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Old 4th April 2006, 11:10 PM   #272
GM is online now GM  United States
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Greets!

Yeah, if I had my way though, it would be a modern day replica of W.E.'s field coil 12" that was good from 50-12 kHz, which allows you to dial in your Q of choice, from a compression horn's ~0.1 to as high as you want to go. With today's materials technology, it could probably be pushed even higher/lower, though inexpensive and small cab would not be part of its specs. You could buy a nice used car for what W.E. charged for it in '32, which in today's world would make Lowther's pricing bargain basement specials, relatively speaking, and minimum cab Vb for solid midbass/45 Hz Fb was 9 ft^3.

Then there's W.E.'s field coil 18" OB sub driver with a motor so massive it had chain hoist/grab handles welded on with a cast base to stage floor mount it.

Those were the days! Without bean counters to suppress design/manufacturing and Bell Lab's 'deep pockets', the engineers/artisans had free rein to make performance the only goal.

Oh well, I can dream........

GM
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Old 4th April 2006, 11:14 PM   #273
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Any comments on the BIB website?

I have emailed Martin King to ask him for his support in continuing to build the site. It is his software thatís generating the dims and sims. I felt it was his right to allow me to continue or not.

I would do whatever needed to continue building the site for the speaker builder community but would hate to see commercial builders take advantage of this information.

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

Peace,
Godzilla
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Old 5th April 2006, 03:20 AM   #274
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Default godzilla...

you might put on a statement like "drawing not to scale" on the pictures of the enclosure explaination. it keeps it mathematically correct.

Clark
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Old 5th April 2006, 04:01 AM   #275
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Godzilla,

I just checked out your BIB page. Nice job. Thanks for taking the time to put it together. Another example of why this board is such a special place.
James
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Old 5th April 2006, 04:10 AM   #276
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You know. Sometimes life is a b****. I ordered a pair of Hemp FR8's from espeaker.com over two weeks ago and before I even receive them I read that Hemp and Adair are merging and that they are going to come out with new and improved...
James
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Old 5th April 2006, 04:31 AM   #277
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Good work Godzilla. You are a credit to the diy community. Some suggestions/comments:

1) Some background on the BiB and, if possible, a reference to the original Nagaoka design and Cain's write-up.

2) Comments by GM and Cain (and of course Moose and Mason). I think the two of them nail the heart of what the design is all about: experimentation and results that defy sims. (Heck, I've stuck in most all drivers that I own and tune by moving the BiBs to and fro from the corners.) GM's comments about swamping vas, sd, qts and fs are precious.

3) Suggestions for variations on BiB, like flipping it so the mouth exits the floor (I think GM recommended this for one of the drivers) and using them for bass towers.

4) A gallery section with some user comments would be the coup de grace'

Thanks
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Old 5th April 2006, 04:31 AM   #278
dmason is offline dmason  United States
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Jimmy

Life is good. Enjoy your Hemps. They are most excellent after proper cooking. The burn in is wildly erratic. I love the TONE.

You wanna really change your mind? Build the BIB's.
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Old 5th April 2006, 07:58 PM   #279
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Default tone

yeah...the bass and tone i am getting out of the fx 120s is simply unreal. everyone who has heard them could have sworn that i was cheating with a subwoofer of some type. i have found that with my shorter pair and higher ceiling height that it helps alot to vary how much they are lifted off the floor. I am currently set on about a foot of lift. i will imagine the 166 esr/168ez version i will build shortly being 64 inches or so to not have as much of an issue with this. of course, while the quantity of bass is huge from the fx 120s, the speed is not quite there. of course, i am splitting hairs here. however, i feel that lower qts would help this immensely. i have a pair of fe 108 esIIs i will try in these cabinets. they should just fit in the hole...

i have found the magnet wire trick to be essential with these drivers as well. it profoundly limits the excursion (and audibly lowers qts to some degree?) versus 16 gauge lamp cord for instance. again, the amp used is ppel84.

thanks so much everyone for making this information public domain and open source.

one of my favourite quotes is

"it is amazing what you can accomplish if you do not care who takes the credit" - harry truman.

diyers, especially the beginners into full range will really have alot of fun with this project i feel. it is highly rewarding for the effort put in.

clark
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Old 6th April 2006, 07:13 PM   #280
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http://www.zillaspeak.com/bib.asp

New modifications... i added the Pioneer B20 dims and the Vistaton logo for the B200 dims and sims to come.... and some other buttons.

Anyone want to submit any contributions to the site let me know.

godzilla3@hotmail.com

Peace.
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