Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 53 - diyAudio
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Old 2nd May 2006, 04:19 AM   #521
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Old 2nd May 2006, 04:25 AM   #522
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Obviously unfinished! The right side is clamped in place. That's one of my old Paradigms doing double duty as a stand to raise the FR125 to ear level, and as the bottom of the cabinet (with a folded dish towel as padding and gasket).

I wound up using plain #2 pine instead of the laminated panels, mostly for cost, but also because it minimized the number of rips needed and I could get two pieces the right length from each 10' board. Hardly any waste!
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Old 2nd May 2006, 04:45 AM   #523
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Ok, so how does the BIB sound?


Be sure to put BIB pix on the BIB site!


I'm gettng close (sort of) to doing a clamp-up
myself. Got the glueup boards at 72 in and have
to get the framing pieces.

Question is: since I want to put some RS 1197's
in these and not do much cutting, the FE103
dimensions show a considerably shorter line
length. I want to get that terminus as close to
the ceiling as I can. :-)


The raw lengths would make long and slender
cabinets but sounding... how? I dunno.
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Old 2nd May 2006, 05:00 AM   #524
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How's it sound, you ask?

A little background first: I'm in an 11' W x 14' L x 8' H den with no acoustic treatments at all. The amp was built for me by a friend who worked at Threshold many years ago. It's based on their Forte' 4, with a few changes (extra pair of IGBT output devices). Roughly 50 WPC, high-bias AB operation. Preamp is Joe Curcio's Daniel 2 design, built by yours truly. Sources, a venerable JVC 1050TN CD player, and a much-modified AR-XB turntable with Grace 707 Mk II arm and Shure V15VMR.

Enough already, the sound?

Very nice indeed! Coherent, non-edgy, a little soft on top. A bit colored through the mids, kind of a cupped-hands sound on male voice. Cabinet resonances are probably at play there, this is not a 'dead' box at all, but as the pic's show one side is not yet glued down. Bass is solid to 40, audible even lower, and seems to be going deeper as the driver runs in. This room has a strong resonance around 40 Hz, and it's in fully audible, no 'dipole-like' effect AFAICT. At comfortable listening levels, even fairly strong bass (e.g. Dub Side of the Moon, the Flecktone's "Flight of the Cosmic Hippo") doesn't seem to faze it.

So far, clamped panels flapping in the breeze and all, I'd call it a success. More to come as I finish up the pair.

Bill
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Old 2nd May 2006, 05:30 AM   #525
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Lousymusician,
Nice pine you have there. How thick are panels and I suppose you have not started playing with damping yet?
In my experience with pine is that you get the same result with chipboard. Of course pine is better due to one can get nice edges almost for free.
I got a huge difference moving my BIBs from a hard ceiling to an acoustical treated ceiling (meaning normal office plates in ceiling).

It will be interesting what stuffing you will end up with.

Best regards Peter
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Old 2nd May 2006, 10:29 AM   #526
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Jordan dims have been sent to Jeff.

Very nice CSS one there. Impressive. Possibly a bit of bracing would help the mids, as pine is a little overly resonant if it's not supported just so.
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Old 2nd May 2006, 02:52 PM   #527
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http://www.zillaspeak.com/bib-pics.asp

http://www.zillaspeak.com/bib-gm.asp

Jordans will be posted later this week. Thanks Scott!
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Old 2nd May 2006, 05:45 PM   #528
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Scott... can you explain a little more about the Jordan config you sent me please?

'Jordan JXR6 Linear Array BIB'

It's not clear how many drivers are used (2?), impedance considerations.. etc.... it appears to be a very efficient system... tho it may require powerfull SS to drive.

Thanks,
Godzilla
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Old 2nd May 2006, 10:13 PM   #529
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4 JXR6 drivers per enclosure in a mini array as per the suggestion on the Jordan website. Personally, I remain unconvinced about even short arrays with fullrange units, but if Ted says its OK, then that's good enough for me. I'd still make pretty sure I was listening in the farfield, not the nearfield though, or the polar response will be rough. Hang fire on that one if you can Jeff, I want to check few more things out before signing it off so to speak. The JX92S OTOH should be lovely. No worries there at all. I want one (well, two, but you get the idea... ;-)
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Old 2nd May 2006, 10:50 PM   #530
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I just thought of something about the BIB's.


After time won't a lot of, you know, dust and whatnot
settle from the open terminus? Wait, never mind, the
driver is in a sealed space.

Boy, that was a close one. ;-)


Will the BIB site give actual cabinet dimensions or
is this a freeform dealers choice? I have not done
much with calculation.
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