Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 193 - diyAudio
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Old 14th December 2006, 08:28 AM   #1921
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Good man. Although Terry can't be with us (or at least not directly) his influences is still as strong as ever it was. I think he'd be happy.

Let us know if we can help. It's what it's all about.

Best wishes
Scott
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Old 14th December 2006, 10:52 AM   #1922
stroop is offline stroop  Germany
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Ok,

Just about there.... My plan is, as I don't have a huge room and neighbours in Germany can be a sensitive bunch (I don't need highSPL)...I am going to try an fe103e in a straightened out BIB, it will be teamed with a T-amp. It is basically a wedge with the driver placed at the 'optimal' .434 line length. They'll be about 220cm (90inches) tall and shaped like a wedge from the side, therefore reducing timber needed, and reducing the impression of size! WAF... I have tall ceilings, around 10ft. I think the fact that they are straightened out and therefore tall, will engage the ceiling no problem.

I could go for the fe126e which is about 20-30cm taller and will give a bit more of everything....but, timber will be harder to get, and will reduce the distance from the horn opening to the ceiling to about 60cm's.

What I need now is anyone telling me why I shouldn't do it! And if I should which driver!

Please GM, Scottmoose...!

Cheers Stroop
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Old 14th December 2006, 12:50 PM   #1923
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I can't think of any reasons not to try it to be honest. Just go for it.

The larger drivers will give more LF weight and extension, and will go louder of course. Any should work fine though.

Scott
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Old 14th December 2006, 01:48 PM   #1924
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Hi Stroop!
It will be perfect for your purpose reg neighbors. My BIB's sound really good at low levels. The bass drum is well defined and speedy. Much better than most "normal" speakers when listening at low levels.

Pjanda: Real nice birch on these monsters, Hemp I suppose?

Scott, I will recieve Sonido 6.5 inchers tomorrow evening.
I gave up the visit in Budapest due to a $%#*load of work before and after christmas. Just plunged ahead and bought them. I can post some porno pictures of them on Sunday. Hopefully I will finish these BIB's in January.

Cheers
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Old 14th December 2006, 01:55 PM   #1925
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Peter, I like your thinking. Life would be very boring if people didn't take a gamble every now and then! I look forward to your impressions of the driver and the enclosure. And the pictures too of course
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Old 14th December 2006, 02:15 PM   #1926
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Well, sometimes one vaste a lot of money by doing this. I bought a Sunfire sub in that way, that is one of the most useless sub that exists. Hmm, I got a good plate amp anyway. Could be useful for an ob sub in the future.

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Old 14th December 2006, 02:23 PM   #1927
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Two completed BIBs are in the back of my truck ready for transport to my office this morning. Hope nothing is mis-wired. Still haven’t heard them yet… but will later today! Stuffing behind the driver and at the base of the cabinet. Had to use a broomstick to get it to the bottom.

Peace,
Godzilla
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Old 14th December 2006, 02:33 PM   #1928
badman is offline badman  United States
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Default possible BIB profile change

Conical horns are largely impractical, but they've got some advantages (another discussion entirely)

Has anyone considered using inserts in the cabinets (corners, etc) to change the taper profile?
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Old 14th December 2006, 03:23 PM   #1929
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Conical is considered impractical usually because of length, as you say.

Problem with deflector plates is that they tend to encourage HF leakage through the horn. If (one of these days) I get around to designing a chambered BIB, it'd be interesting to see the effect.

Jeff -enjoy!
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Old 14th December 2006, 03:23 PM   #1930
GM is offline GM  United States
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Quote:
Originally posted by Kensai
GM,

Thanks for the Definitely don't have budget for failures like that. Just desperate to find a project that would actually be an all around upgrade to my existing mains in the living room.
Greets!

You're welcome!

IIRC I made the comment earlier that if I had known this thread would take on a life of its own I would have used a different criteria for sims since a corner horn can be acoustically large enough that the driver's Fs has little meaning WRT its cut-off when maximizing power handling isn't a major issue, but yours wouldn't be sufficiently corner loaded based on your description, so might be an issue if not floor loaded.

Anyway, as Cheesehead noted, there's more than one way to 'skin this cat', but I didn't have enough time to elaborate. I had in mind loading the woofer in the BIB with the FE87E 'tweeter' in a full height front IB cavity if there was enough room since its Qts is already on the high side. This allows you to place it at whatever height works best, be it ear height, 2/3 TV screen height, whatever.

Anyway, this woofer's Vas is so low that a BIB style pipe is a bit much for it, which isn't to mean don't use it, quite the contrary in apps such as yours where you're forced to 'make do' for whatever reason, so adjust your BIB design's depth to allow a deep enough front cavity for the tweeter and make the BIB 's divider length whatever is required to get the proper equidistant spacing. Driver location in such an acoustically large cab allows considerable latitude, so either mount the woofer on the same horizontal plane as the tweeter or as high up as it will physically go to make them as coincident a source as practical. The pipe's efficiency will probably jack it up enough to EQ them ~flat in-room to at least the driver's Fs.

Obviously, an XO will be required unless you plan on stocking 'tweeter' replacements by the case and I recommend it be at least 250 Hz/2nd order, though 500 Hz/1st is what I would try first since it's the technically correct 'textbook' thing to do based on published specs. Bottom line, unless you get lucky, some experimentation will be required. Here, a female's generally superior hearing is your friend.

GM
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