Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 426 - diyAudio
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Old 8th September 2008, 01:39 PM   #4251
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Sawdustfull summer behind and I finally got my BiBs ready.

Speakers are 70inch tall as ScottMoose suggested, and I must agree they're not ugly at all.
Width is 225mm and Depth 545mm, which gives me little extra to low end.
With a little padding inside of them the sound they produce is excellent.

Summertime well spent, coverd with sawdust...
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Old 8th September 2008, 03:47 PM   #4252
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Quote:
Originally posted by mightym
GM, Thanks for your reply.

How about a columnar-in-the-corner M19 variant?

This would be rather difficult to achieve.........

..........is there any available weblink that might illustrate the proper uses of an WTW alignment..........

I've seen others refer to "comb filtering" and "lobing (?)"
Greets!

You're welcome!

Not really, but if you're serious about pursuing this, then start a new thread.

Not aware of any per se, but where little tweeters are mating to large drivers, then you ideally need to be pretty far away from them as you can hear them as two distinct point sources and WRT multiples, that's best delt with by a bipolar layout with the rear one rolled off, i.e. 2.5 way to act as acoustic BSC.

'Comb filtering' is a summing of BWs far enough out of sync (phase) that they create a series of peaks/nulls 'sawtooth' type of response. 'Lobing' is when multiple sources are beaming the same BW, so it's what causes comb filtering. Even if they sum well on axis, if you don't have a flat power response off axis also, then comb filtering increases with increasing off axis angle, ergo either coincident or proper WG designs at least in our acute hearing BW is a worthwhile performance goal.

GM
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Old 8th September 2008, 03:51 PM   #4253
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Quote:
Originally posted by tpakkanen
Sawdustfull summer behind and I finally got my BiBs ready.
I miss those days, so many drivers/'dream' designs, so little time.........

Anyway, FE206E? Any EQ used?

GM
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Old 8th September 2008, 05:21 PM   #4254
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Plain FE206E, straight signal from the amp. Sounds good to me.
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Old 29th September 2008, 06:13 PM   #4255
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Default bib for normal woofers?

hi

just out of couriousity can you use a bib sort of cabinet for normal woofers?

leaving a fullrange in charge of everything over say 100 or 200 hz.

or maybe use it as a cabinet for a two way three way system?

best regards

uwe
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Old 29th September 2008, 06:35 PM   #4256
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Sure.. gotta put a low pass filter on it and viola!
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Old 29th September 2008, 09:48 PM   #4257
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'The destroyer chief moderator'?

oooooo.....lol

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Old 29th September 2008, 11:09 PM   #4258
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Quote:
Originally posted by Variac
Sure.. gotta put a low pass filter on it and viola!
Not necessarily, just use a typical high Xmax, low Fs sub driver tuned to around Fs rather than an octave below it. For calculating a BIB, just input Fs as 2x whatever you want it tuned to get the design details.

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Old 30th September 2008, 12:22 AM   #4259
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Quote:
Originally posted by GM


Not necessarily, just use a typical high Xmax, low Fs sub driver tuned to around Fs rather than an octave below it. For calculating a BIB, just input Fs as 2x whatever you want it tuned to get the design details.

GM

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Old 30th September 2008, 02:35 PM   #4260
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Yeah, it's a really simple, flexible design routine. There's some 'sub' BIB designs buried in the thread, maybe I can find them and get them split out into a separate thread where they will have more exposure. Frankly, the few pipe horns I built were all 'sub' horns with OTC 350 or 500 Hz XOs as I never considered them as viable for 'FR' drivers alone from a theoretical POV due to their excessive 'ripple' (by my standards). Apparently I was wrong.........

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