Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 190 - diyAudio
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Old 11th December 2006, 04:18 PM   #1891
pjanda1 is offline pjanda1  United States
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The Hemp BIB's are upstairs and playing. I actually got them set up last night. They sound fantastic. They are entirely different from the previous set up with these drivers, sealed boxes and a TL sub. They have an incredible amount of bass. My sealed enclosures didn't have BSC, so I'm used to a lean, slightly bright sound. These sound like the heavyweights they are, though they are very agile. The bass on some recordings sounds really tight and quick, on others it sounds bloated. Either way, it sounds much flatter, clearer and more articulate than my previous set up. The midbass quality is stunning.

They drivers hardy move at average listening levels. The cabinets vibrate less than the previous enclosures, which is interesting given the size of the unbraced sections. I was planning to add some exterior bracing, but I don't think it will be necessary. Nothing but bass is coming out of the mouths. Both panel resonances and midrange through the horns were concerns of mine.

So far the only downside is the driver height. My chair isn't that high. I listen off axis anyway so the tonal balance is fine, but the sound is way up in the air. My old enclosures were too low, and I got used to them, so I'm sure I'll get used to this.

I hate to make judgements without listening longer, but overall they seem to be a big step up. I'll post some pics later. I also hope to make some SPL measurements.

Paul

construction details again: dims: Scottmoose's of zilla's site (sm is actually 201). Due to an error I decided not to correct, the aspect ratio is 1.46. All 18mm Baltic Birch ply, front baffles are double thick. They have a handle/brace across the mouth, I'll post a pic of it. They each have a pound of acoustuff. Half of it is teased from just below the driver to the top of the line. The other half is in the bottom. I used PL Premium Polyurethane construction adhesive as glue. I highly recommend it if you can't cut to with 1/64". I can't. It's a pleasure to work with, just don't get it on anything.
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Old 11th December 2006, 04:51 PM   #1892
Variac is offline Variac  United States
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Quote:
if you had high ceilings (10-11 feet)
I wionder if anyone has experience with what happens when the mouth of the horn is more than , say two feet from the ceiling. Does this affect the bass output because there are only 2 planes involved (the walls) vs. three planes (walls and ceiling)? I suspect it works pretty well either way, and in fact, all three affect the out put even if the mouth is 3 or 4' from the ceiling, but it would be nice to know the optimal spacing.
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Old 11th December 2006, 05:13 PM   #1893
pjanda1 is offline pjanda1  United States
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Mine are about 2ft 8in from the ceiling. I have no idea how it affects the output, as I don't have a house with a shorter ceiling. I have wondered what the ideal distance is though. I've already contemplated flipping mine over onto stands, as the driver height could then be lower.

pj
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Old 11th December 2006, 06:05 PM   #1894
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I have dodged a bullet in my one BIB test mule in that
I can reposition the back panel enough to compensate
for that difference in the measures for completion of the
horn as stated in the post above #1877.

I was too lazy to trim off the bit of excess on the
glued up commercial shelving I used and so by releasing the
glue joint with a putty knife could likely make the
adjustment.

other things first though.

Sonic impact t-amps are backordered at Parts Express
until January of 2007. This puts many things on hold.

But I'm ready to try the build with a supra baffle made from
a ready-to-paint plaque from the Hobby Lobby. Finding
the exact center of an elipse came close by eye but still
not professional grade and off by a bit. I got some round
ones as well and may run into the same centering
problems.

And a question: For ceiling loading (which seems muddy
if the BIB is tight and square to the corner) will angling
out to allow for better dispersion of the driver to the
listener position improve tonal balance. I have yet to
try the BIB at a 45d angle from the wall and an improved
amp over the Radio Shack SA 155.
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Old 11th December 2006, 07:33 PM   #1895
GM is online now GM  United States
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Default The big bear has gone....

http://www.audioasylum.com/forums/hu...es/116348.html
http://www.6moons.com/showcase/terrycain/terrycain.html
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Old 11th December 2006, 07:47 PM   #1896
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Default Re: The big bear has gone....

My sympathies to Terry's wife Leslie and the family.

Please keep us informed of the need for help with
expenses via the auction that is now in progress. I was
working up a donation of a build and thought I had more
time.

Terry will be remembered in the work that we build and
have built from his inspiration.
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Old 11th December 2006, 08:55 PM   #1897
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Amen to that. Godspeed my friend. And my heartfelt sympathy to Leslie at this difficult time.

Thank you Greg, for letting us know. I wish I'd known Terry better. I think this thread actually contains his last on-line contribution. He was a craftsman, a canny speaker designer, and an enthusiast who tried to help people consider different options rather than following a proscribed path.

More importantly, he was just a decent bloke. The world is a little emptier for his passing. But we'll remember him in our work. It's a good memory and memento to have.

Scott
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Old 11th December 2006, 10:33 PM   #1898
ronc is offline ronc  United States
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Amen Scott.

ron
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Old 11th December 2006, 11:06 PM   #1899
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Default meet ya at the end Terry...

Gone home. Good bye.
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File Type: jpg terry cain.jpg (49.5 KB, 440 views)
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Old 12th December 2006, 01:53 AM   #1900
zobsky is offline zobsky  India
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From many of us on this forum, ..
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