Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 211 - diyAudio
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Old 31st December 2006, 04:52 PM   #2101
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Attention BIB-heads. Dan has just drawn my own, er, attention, to the Ciare HX132 unit, which has specifications spot on for this sort of load, and by all accounts, a good sonic reputation. Nice build and looks too. Like the Monacor SPH-60X, it's a drop in replacement for the RS40 1354, and at 83 Euros apiece from Spectrum audio, it's not very expensive. Here's its 1/2 space performance in Terry Cain's original cabinet.

have at 'em!
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Old 1st January 2007, 04:29 PM   #2102
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Hi!
Or why not Cantare 5FR MKII. At 50 EURO/piece and also the specs (guess) are similar. Some builders in Germany are fond of them. It shure looks like a copy of Ciares.

Regarding the stuffing, I've spent considerable time to find the right amount for my room. it;s a "cold " room with alot of hard surfaces, so what's good here will maybe be a disaster in a softer room.
Anyway I ended up with loosely fluffed pillow stuffing from the closed end down to driver. 10 mm BAF wadding behind driver about 20 cm down the sloping baffle and 2.5 cm BAF on the bottom. I will try with wool lining in my new BIB's to be born in January.

Scott, My wife asked before Christmas how BIG the Sonido versions will be. Of course I answered MUCH bigger than your sim Wife responded with an "Aha" and a shrug!!!
Here comes the question then, if I keep length, position of driver but increase the suggested mouth area to 100 square inches, will it work or not?
As usual, thanks for patience and for help.

Best Regards Peter
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Old 1st January 2007, 05:03 PM   #2103
GM is online now GM  United States
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Happy New Year!

Hmm, MJK must have really revised his WS, I get a somewhat underdamped response with his freeware WS and the Ciare's published specs:

GM
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Old 1st January 2007, 05:12 PM   #2104
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I have made a few minor updates but not enough to explain the differences in the results seen in these two plots. If I look at the blue dashed curves, the infinite baffle responses, I begin to wonder if you are using two different sets of T/S parameters.
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Old 1st January 2007, 06:05 PM   #2105
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Looks like it Martin, judging from the IB curves. I used the specs off the Spectrum audio site:

Re 6.8ohms
Le 0.2mH
Fs 65Hz
Qe 0.73
Qm 1.96
Vas 15 litres
Sd 84cm^2
Bl 4.95

I've just re-run the sim and it still comes out the same. I'll see if I can seek out some other specs. and see what gives. Bloodhound mode engaged!
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Old 1st January 2007, 07:39 PM   #2106
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Greets!

Unless I have measured specs I can trust, I use factory specs when available since they are typically better than what you can buy and size cabs on the large side to compensate: http://www.ciare.com/pdf/catalogo/HX132.pdf

GM
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Old 1st January 2007, 07:50 PM   #2107
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Aha -that explains it. Agreed re the factory specs. I probably shouldn't have used the Spectrum ones.

Peter, I'll check when I get a minute. Probably give a slight lift at Fc., but don't quote me on that -I can't remember off the top of my head what the FR looked like.

Woof.
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Old 2nd January 2007, 04:28 PM   #2108
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Happy New Year everyone!!!

Hey Godzilla thanks for your kind words!!! I'm afraid the amp I've got is such a piece of manure (great word that!), I can't really do anything until I get a decent starting point, so I know what I'm playing with in terms of stuffing! At least then I'll have something with 2 equal channels! Still even with this rubbish they have moments of brilliance!

Anyone who can give me their impression of the fe108's in regards to their top would be most appreciated, I'm finding them a bit syl...sybil...sibilan...darn it...the 'esses' are prominant at the moment, but not all the time...from what I can remember this doesn't usually pose any problems, so I think it must be the ugly amp.

This is my first real experience of full range speakers and I gotta say that the impression is, is that they are sooo fast in their response!!!! There is no dampening or slowing down of things like say percussion, due to an XO. I get a real attack! I guess a fully active system might be similar. So, yeah...in my opinion dynamics are there. (Is this what people mean when they say 'micro dynamics'?) I think in passages where there is very thickly orchestrated dynamicism then i think we could be getting into trouble...maybe! I'm yet to try these out with a good amp and Cd player. They are desperately trying to give me an image and play beautiful music! I can only imagine how they would perform with an SET amp or Ucd.

I love 'em so far, even with their faults which, I believe can be mostly corrected and most likely are caused by factors not to do with the boxes themselves.(I say mostly because I personally don't think 1 system should be asked to do all music perfectly. I am not looking at creating a one size fits all solution to audio. I am actually trying to 'optimize' my system to my musical taste! How's that?!) My room is also really reverberant too, which muddles things up a bit..

I'm trying to be objective here which is difficult, primarily because I built them from the ground up! Yeah I'm a proud dad!

Cheers Stroop
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Old 2nd January 2007, 04:32 PM   #2109
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Just forgot to mention, Godzilla.....straight pipes with fe16x's woah man... You ROCK!!! They are big fellas, even the little fe108's are tall! But the sound...hmmmmm.
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Old 2nd January 2007, 04:41 PM   #2110
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I think Jeff is refering to his Bob Brines designed ML TQWTs, though I speak under correction. I suspect they're a bit small for 167s actually (not enough volume), but they might work OK.
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