Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 72 - diyAudio
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Old 21st May 2006, 03:12 PM   #711
el`Ol is offline el`Ol  Germany
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The BIB would be 18x39 cm inside (700cm^2 mouth area). Throat is 1 meter above ground, mouth is 1.5 meter above ground. Throat is 7.5x18cm, the closed end above is dead, maybe filled with mounting foam.
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Old 21st May 2006, 03:20 PM   #712
el`Ol is offline el`Ol  Germany
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The 100Hz-problem however would be still there, maybe one could reduce it by stuffing.
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Old 21st May 2006, 04:29 PM   #713
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Quote:
Originally posted by GM



Greets!

Hmm, I thought I did these already, but if I did I didn't save it. Anyway, it looks fine in the 'stock' BIB. Its specs looks almost too good to be true, especially at this price, so probably is.

Anyway, anyone have any experience with this driver and/or their 'Ella' amp?

GM
Hi

I read a statement from someone at diyhifisupply somewhere, that these are more widerange than fullrange - like the CSS WR125 they need help in the treble.

best,
martin
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Old 22nd May 2006, 02:27 AM   #714
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LOL... my front baffle will have to be doubled up to fit the driver because the magnet is too deep. That's double on top of what's already there! 2.25" thick front baffle!! Grrrrrrrr.... It's all part of learning. Please check your measurements when building your BiBs to make sure the internal baffle allows the driver to sit properly.

Godzilla
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Old 22nd May 2006, 03:06 AM   #715
oface is offline oface  United States
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I had to refit my interal baffle many of times till i thought i got the correct fit ,, and lo and behold i still had to double up the front baffle,,

i like the look of it anyways,, and still diggin' the sound ,,

good luck there 'zilla,,


enjoy ,,


chris
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Old 22nd May 2006, 08:36 AM   #716
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Quote:
Originally posted by Godzilla
LOL... my front baffle will have to be doubled up to fit the driver because the magnet is too deep. Godzilla
Just blame me and ready the bonfire for my ritual burning. Much easier. Satisfying too.

Jeff, you could try adding a false baffle a la TC, though unless you have the necessary lathe etc perhaps another shape might be best. I suspect that's one of the reasons Terry uses them anyway. Driver clearance, additional front baffle stiffening, a shifting of the baffle-step point and surface wave launch.
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Old 22nd May 2006, 05:06 PM   #717
GM is offline GM  United States
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Quote:
Originally posted by karlsoncab
hey Ziller and GM - can U do one for Eminence Beta 8CX?
Greets!

Stock except for Sm, so:

L = 138"
zdriver = 30"
Sm = 110"^2

Looking forward to your subjective opinion of it Vs the Karlson.

GM
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Old 22nd May 2006, 06:18 PM   #718
fred76 is offline fred76  Philippines
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Quote:
Originally posted by GM


Greets!

DX2 with 2 ohms series R:

L = (Line length) 138"
So = Driver 30" down from sealed end of cabinet
Sm = 220in^2

DX3, DX4, C45 with 4 ohms series R:

L = (Line length) 120"
So = Driver 25.2" down from sealed end of cabinet
Sm = 220in^2

GM

Hi GM,

Would the DX2 and DX3 dims be essentially the same for the EX2 (2 ohms R?) and EX3 (4 ohms R?)? Would the series R value be the same regardless of amp type, valve (pp or se) or ss? Thanks!

http://www.lowtherloudspeakers.co.uk/EXseries.html

fred
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Old 22nd May 2006, 06:20 PM   #719
GM is offline GM  United States
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Quote:
Originally posted by loninappleton
I was sort of curious about the FX200 in a BIB,

as long as you're taking requests.
Greets!

L = 203"
zdriver = 42.58"
Sm = 330"^2

Without effective ceiling corner loading though, the lowish Fs means a 3rd harmonic dip in the midbass were we least want it.

GM
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Old 22nd May 2006, 07:26 PM   #720
GM is offline GM  United States
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Quote:
Originally posted by fred76



Hi GM,

Would the DX2 and DX3 dims be essentially the same for the EX2 (2 ohms R?) and EX3 (4 ohms R?)? Would the series R value be the same regardless of amp type, valve (pp or se) or ss? Thanks!

http://www.lowtherloudspeakers.co.uk/EXseries.html

fred
Greets!

I assume so, based solely on comparing published specs. You need at least this much to get a ~BIB response, so if the amp has more, it will alter the response similar to adding the difference in series R to a driver that doesn't need it.

GM
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