Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 80 - diyAudio
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Old 4th June 2006, 04:18 PM   #791
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Default Cain & Cain I-BIB

I was at the HE2006 Show yesterday and had the chance to listen to Terry's new speakers throughout the day. First off, they are amazing looking. The finish quality on the woodworking and wood grain is really something to behold.

Secondly, they really give the impression of a tiny footprint. From the front, and even side, the main impression is "slender". Some of the most unimposing speakers I've ever seen. WAF factor is very, very, high. I've got a little experience in this department becaue I have Terry's I-Bens which are probably 3-4 times as wide and imposing. The fist and only thing my girlfriend said for a few months was "They're HUGE! What are we going to do with those things? They're HUGE!" She's gotten used to them since then.

The I-BIB is so slender, even a side glance is unimposing. They will not dominate a room they way larger horns do. Very, very, attractive. Perfect for those who have smaller rooms, apartments, condos, etc. Also, the semi-corner loading really helps keep them out of the way.

Now, on to the matter of real importance - how do they sound? Pretty damn good so far. There was a big difference in sound quality between when I got to the show Saturday at 11:00am and when I left at 6pm - intially good, but not much warmth. Since they were brand new, hot off the CNC machine and only arrived Thursday, the tiny Fostex 3"(?) were still breaking in.

I don't think there's any need for a supertweeter from what I could tell because treble extension is pretty damn good. Lots of detail, shimmer, and decay of cymbal brushes. The midrange is very, very, accurate and developed greater richness or body by the end of the day. At 11pm, the BIB's were "interesting", accurate, and detailed. No obvious bloat or distortions. By 6pm, they were fleshing out and getting pretty damn engaging for such a small driver and slender cabinet. Obviously, nowhere near as deep & rich as my Bens or other similar designs with much bigger drivers and cabinets. But in he right crcumstances, great. I'm going today, so we'll see if they continue to get better.

They definetly need a subwoofer and blended seamlessly with Terry's Bailey subwoofer, there really was no detectable transition point. The exhibitor, Paul Lim, of Imagine Hifi, said he thinks that's because of the BIB's steep rolloff in the bass region.

Paul was driving the I-BIB's with an $800 ALmarro A-205A EL84 set integrated. This little amp always sounds great with whatever speakers it's matched. The EL84 just has this "rightness" to it.

This is a very interesting design(at Terry's dimesions) that has fantastic potential for people with moderate to small sized rooms.

I am really impressed with what a 3" driver can do. The Fostex gets a pretty serious workout if you check the excursion on complex music.
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Old 4th June 2006, 06:09 PM   #792
dhenryp is offline dhenryp  United States
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dark - In the picture earlier in this thread, it appears the bottom rear of the speaker is back open at an angle. Is this because the mouth is at the bottom or is it still at the top of the box?

Denis
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Old 4th June 2006, 11:35 PM   #793
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Quote:
dark - In the picture earlier in this thread, it appears the bottom rear of the speaker is back open at an angle. Is this because the mouth is at the bottom or is it still at the top of the box?
Yes, I wish I had a camera to show, but the bottom angles from the front to back at an ~45 angle. Maybe a little shallower.

The thing that really needs to be appreciated is the focus that the Fostex driver and BIB's have. I'm not talking about imaging as much as notes, themselves. The are clearly defined without blurring or overhang.
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Old 4th June 2006, 11:51 PM   #794
dhenryp is offline dhenryp  United States
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Dark - Is the exit at the angled bottom or is it at the top (like the BIBs in this thread)?

Denis
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Old 5th June 2006, 12:01 AM   #795
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Quote:
Dark - Is the exit at the angled bottom or is it at the top (like the BIBs in this thread)?
At the angled bottom in Fred's picture - approx. 30-45 degrees. The top is completely closed.
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Old 5th June 2006, 12:22 AM   #796
dhenryp is offline dhenryp  United States
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Quote:
Originally posted by darkmoebius


At the angled bottom in Fred's picture - approx. 30-45 degrees. The top is completely closed.

Thanks!

So much for the magic of ceiling loading...
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Old 5th June 2006, 12:26 AM   #797
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It's an inverted BIB. Pretty cool actually.

Godzilla
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Old 5th June 2006, 07:44 AM   #798
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Quote:
Originally posted by dhenryp

So much for the magic of ceiling loading...


The floor will do basically the same job. I'm not trying to put words into Terry's mouth, but it looks to me like he's taken the most logical approach: a high[ish] Fs driver naturally has a shorter horn length, which, in a regular BIB, means the terminus will be further from the ceiling than is ideal for completing the horn mouth. They appear to be ~45in tall, which means that they are set to the usual 1/2 Fs or thereabouts. By flipping it, he's ensured that the terminus will always be at what he's determined to be the ideal distance from the reflectional boundary condition[s] for the correct loading. By cutting it at an angle, he's also increased the mouth area over what would normally be the case in a cabinet of those dimensions; it should also prevent any significant restrictive loading of the terminus by the pedestal or the floor itself, a la a bottom-mounted port. Good way forward for drivers with an Fs <60Hz. They look lovely.

Best
Scott
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Old 5th June 2006, 11:24 AM   #799
fred76 is offline fred76  Philippines
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Quote:
After seeing what the BIB load for the Supravox 165LB looked like, ie: squat and big CSA
Hi,

GM's 165LB dims is indeed big (Sm=300"^2), but it's for max gain. Scott's dims are more manageable IMO even if there's less bass:

http://www.zillaspeak.com/BIB-Supravox.asp

However, I'm not sure if you already tried Scott's dims and wasn't really happy with it compared to your 168EZ BIB.

fred
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Old 5th June 2006, 12:51 PM   #800
dhenryp is offline dhenryp  United States
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I also think the C&C BiBs are beautiful. Nice proportions, beautiful finish (of course) and the rear throat makes for a more interesting looking box. They also have the practical advantage of keeping dust, toys and small animals from getting stuck in the throat.

Regards,

Denis
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