Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 22 - diyAudio
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Old 16th March 2006, 11:17 AM   #211
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>>> Hi Terry -good to see you & hope you approve!

If Terry doesn't approve the page goes away.

Peace,
Godzilla

http://www.zillaspeak.com/bib.asp

BTW, subwoofer BIBs turn me on... boring boxes begone!
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Old 16th March 2006, 11:38 AM   #212
MuaDibb is offline MuaDibb  United States
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The site is looking great! When the final dims get put up, will they be outside diameter and assuming 1" thick material?
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Old 16th March 2006, 01:14 PM   #213
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For my part, external assuming 3/4".
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Old 16th March 2006, 05:25 PM   #214
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Oh I approve!!!!

Let the bigness embiggen!!!

TC
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Old 16th March 2006, 05:29 PM   #215
chrisb is offline chrisb  Canada
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Mr Zilla,

cool - looks like the only current Fostex driver you haven't modelled is the FE127E - any reason that wouldn't work as well?
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Old 17th March 2006, 12:12 AM   #216
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Quote:
Originally posted by Scottmoose
I haven't put the MathCad simulations up because as they stand, they're not particularly accurate representations of these cabinets in-room behaviour. The currently available sheets on Martin's site give a great 1/2 space simulation of their behaviour, but this is not an accurate in-room representation of their response, because they are designed for 1/4 or 1/8 space (rear wall or corner) loading, which flattens their response curve and increases their LF extension into the room, as Martin and Greg point out. In a 1/2 space simulation, they frequently look vile; in 1/4 or 1/8 space reality, they actually work very well. I'm currently working on using the lower, in-room half of Martin's new sheet to come up with a 1/4 space response simulation, and if I succeed, I'll post some curves as they will be a better representation.
Awesome if the 1/4 space sims work out, but even if they don't I still think they would be valuable. If all the plots are equally inaccurate for the same reason, wouldn't they still be useful to compare the different drivers/dims to each other?

'Zilla could add the paragraph you wrote above to the page as a disclaimer, so as to not frighten off future builders.
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Old 17th March 2006, 03:33 AM   #217
GM is offline GM  United States
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Quote:
Originally posted by pjanda1
I was thinking that myself. This looks like a good candidate to me, given the price and friendly Qts.

http://www.ascendantaudio.com/assassin10specs.html
Greets!

Its Fs is too low, but doubling CSA and adding an 8" x 8" vent yields 95 dB half space eff. down to 30 Hz. Not too shabby for a 10".

GM
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Old 17th March 2006, 03:41 AM   #218
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Quote:
Originally posted by Scottmoose
I haven't put the MathCad simulations up because as they stand, they're not particularly accurate representations of these cabinets in-room behaviour.
Greets!

So what? The typical box programs used to post sims are theoretical half space just like MJK's.

GM
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Old 17th March 2006, 03:45 AM   #219
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Quote:
Originally posted by Scottmoose
For my part, external assuming 3/4".
Greets!

Seems they should be inside dims with the inside baffle thickness as a variable.

GM
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Old 17th March 2006, 03:49 AM   #220
GM is offline GM  United States
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Quote:
Originally posted by AudioNewb
If all the plots are equally inaccurate for the same reason, wouldn't they still be useful to compare the different drivers/dims to each other?
Greets!

Yep, that's all I'm doing is comparing against the 40-1354 BIB sim.

GM
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