Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 7 - diyAudio
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Old 7th November 2005, 04:08 PM   #61
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Scott

I had been running the Welborne Labs 300Bs, (7w) but recently switched to an Audio Zone gainclone prototype running 40w. I found the imaging of the Audio Zone much better than I expected, and I like the extension it provides at both ends of the audio spectrum. Plus, I tend not to have the time required to get the best out of tubes, as they should run for a while when they are turned on, where I can just leave the Audio Zone on all the time.

Layne
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Old 7th November 2005, 05:34 PM   #62
dmason is offline dmason  United States
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Ditto. Last night I switched the 168Sig BIB from 2 SET watts to the battery powered 30 watt Tripath from Red Wine. The overall effect jumped spectacularly; imaging now insane, bass response full and true, and DEEP, very nice indeed. If I were to run a SS amp full time I would likely put about 5Ohm resistor in series, would aid the driver and the amp's FR, which is highly impedance sensitive in the single stage T amps, it seems. Either way, very good sonics. Beautiful presentation, dynamic as hell, and just alot of fun to listen to. Overall though, the Sigmae are happier with lower DF of tubes....but the Audio Zone and Channel Islands GC amps sound very interesting from what people are saying about them, used with WB drivers.
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Old 21st November 2005, 05:16 AM   #63
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Default got a question about BIB and variants of

BIB's are open at the back if I remeber correctly, could a smaller unit like a zigma hornet or Cyburg needle or voight pipe for that matter be build in the same fashion open in the back. Would this increase the base extension of these units?

Mark
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Old 21st November 2005, 10:40 AM   #64
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They're open at the top, not the back. A Voigt Pipe could, I suppose, be constructed with a rearward-firing vent, and that could take advantage of a close rear-wall to boost the bass, but I'd avoid the VP and all other So=) pipes as a rule. The BIB appears to work because of the line-length and the position of the mouth at the top of the cabinet, which, when positioned correctly, interacts with the room in a very specific way. The VP doesn't have that facility, hense the rotton sound when compared to other TQWTs that have been properly designed (either the BIB, or something designed using Martin King's MathCad worksheets).

Scott
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Old 21st November 2005, 02:50 PM   #65
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I agree with Scott. When considering a pipe and you have choices, I'd highly recommend the BIB over a Voigt. I've heard both and the BIB is much nicer and probably easier to build.

The BIB simply builds on and expands the thinking behind the Voigt. It successfully takes it to the next level.
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Old 21st November 2005, 04:51 PM   #66
dmason is offline dmason  United States
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"BIB expands on the VP principle...."

Agreed. ...FWIW, in my opinion it produces the most effortless and open sound of ANY speaker that uses enclosures. BIB's and open baffles are where it's at.

Scott, did you happen to run numbers for the Monacor 5"?
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Old 21st November 2005, 09:56 PM   #67
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Ah yes, the Monacors. I've had a bit of a re-think about those, given some of the comments I've read elsewhere (all positive). Sorry it's been a while -I haven't had much time for the boards or even emails recently -too many family problems I won't bore you with. Thanks for reminding me about those drivers though. The Monacor 5" jobs (nice drivers, especially for the price -everybody should have a pair) should do OK in the original cabinet, although it's a little too large for them, so I suspect boom would be a problem unless they were chronically over-stuffed.

Better bet: if we assume we're going to keep the original 1" build material, I'd select a 13" external depth, keep the original 7" external width. Internal baffle ends 5" from the floor and 5" from the front and rear internal walls. Total line length of 112". Cabinet height (not including base / plinth / whatever) of 56". Driver mounted at 30 3/4" from the base.
Should work nicely.

Cheers
Scott
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Old 22nd November 2005, 04:21 PM   #68
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Default BIB's

Well, I like what everyone has said so far and I think I'll build a set of BIB's. Has anyone run any numbers for different drivers though ie: tang band 4", FE103E's or varriants in this price range, buget is an issue. I know these are smaller than Terry's RS 1354's at 6" if I remember right here but would it work?

Mark
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Old 22nd November 2005, 09:45 PM   #69
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You'll find some dimensions I came up with for the Tang Band Bamboo 4" jobs in one of my earlier posts (post 53 on this thead). With their 3mm Xmax, we could be on to something with those. Same dimensions apply for the FE103E, but in this case, I'd expect the TBs to be the better driver.
Top budget honours in my book at this time go to those Monacor 5" jobs. Nice mid Q, and they cost all of $18US. Can't go wrong really at that price, and I gather our German friends love them to death -they shift more of those than any other full-range driver.
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Old 23rd November 2005, 12:02 AM   #70
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Smile Bamboo pipe...

Hi Scott!

What size opening would you use for the TB 4" Bamboo cabinet you specked?

Also, since you felt the FE103 would also work in the same cabinet how do you think the Bamboo would work in the Fostex recommended spiral horn?

http://www.fostexinternational.com/d...igma_enc.shtml

TIA,
Godzilla

>>>Try with these cabinet dimensions (assuming 3/4" build material) of: external depth: 10 1/2". External width: 5 1/2". Cabinet height of 60" and an overall line length of 120". Driver mounted 31 1/2" from the base. That's a bit long for them, but the original cabinet was over-long for the RS drivers, and as these Tang Bands have a very considerable 3mm Xmax, they should be OK with the load, and also have enough excursion to produce reasonable bass. I'd guess a cut-off point of around 40Hz in-room -not bad for a little 4" driver methinks. In fact -I think I'll buy a couple myself and give it a whirl. And no, I'm not joking!

Cheers for now
Scott
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