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Old 1st April 2012, 03:14 PM   #1
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Default BiB help.

attached is an output for a BiB from the MJK worksheets.

i am assuming this is terrible yes?

what do i do to avoid the massive low-end hump?

the phase goes crazy too, is this going to result in a muddled sound?

basically HELP!

thanks

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Old 1st April 2012, 03:26 PM   #2
zman01 is offline zman01  Bangladesh
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You can have a look at this monster thread:

Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks?

Properly stuffed and placed near corners, the BiB in room sound is very good actually. Lot of satisfied users out there.

Last edited by zman01; 1st April 2012 at 03:29 PM.
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Old 1st April 2012, 03:41 PM   #3
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changed the listening position to be more accurate and realised i had the wrong reflective surface mode thinger.

does this look ok?

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Last edited by gafhenderson; 1st April 2012 at 03:43 PM.
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Old 1st April 2012, 03:54 PM   #4
zman01 is offline zman01  Bangladesh
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I am no expert, but FR chart looks better.

I am pretty sure GM (Greg Monfort) will have some words of wisdom for you.
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Old 16th April 2012, 02:55 PM   #5
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bumping with new design sim.

is this worth building? i can go down to the drivers 50hz Fs (not at any reasonable volume tho) without exceeding 1mm of woofer displacement (according to simulation) using 10watts, giving a resulting 100db noise which should *hopefully* be loud enough for the room. anything lower than this and i exceed 1mm displacement unless i keep the volume 5-10db quieter.

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Last edited by gafhenderson; 16th April 2012 at 03:25 PM.
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Old 16th April 2012, 04:30 PM   #6
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What driver are you using?
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Old 16th April 2012, 04:42 PM   #7
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Quote:
Originally Posted by Godzilla View Post
What driver are you using?
that big 12" FANE thing.
http://www.fane-acoustics.com/downlo...00LT_Specs.pdf

i'm still fumbling through various designs trying to find something that gives modest bass @ high enough volume to fill the space, without going over that 1mm displacement that i've read i want to adhere, in order to avoid excessive doppler muddling up the sound.

any help would be greatly appreciated with enclosure types. apereodic was suggested @ around 50ltrs but this seems too hit and miss (for my competence level) and isn't the type of enclosure i want to use when i'm finished learning and playing and get some real drivers. so i'd prefer to try and use a transmission line et al type design.

thanks.
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Old 16th April 2012, 05:40 PM   #8
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You can do OB with this as long as you have bass support. Attached is my effort. Same goes for sealed. Just seal the driver up and add bass support (does not have to be H-frames like i did, can be a powered sub of your choice). I know about the aperiodic 'empken' design. It looks like a winner to me and may not require bass support.

Zilla
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Old 16th April 2012, 10:54 PM   #9
GM is offline GM  United States
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Cab wise, only a huge BLH will have enough acoustic gain to allow high SPL down low at only 1 mm excursion.

GM
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Old 16th April 2012, 11:20 PM   #10
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Quote:
Originally Posted by Godzilla View Post
You can do OB with this as long as you have bass support. Attached is my effort. Same goes for sealed. Just seal the driver up and add bass support (does not have to be H-frames like i did, can be a powered sub of your choice). I know about the aperiodic 'empken' design. It looks like a winner to me and may not require bass support.

Zilla
i'm not sure i'm a fan of the OB sound. I have subwoofer designed but i was hoping not to need it too much, i could theoretically use the 2x12" subs with an OB but they're fairly crappy car drivers picked up for very cheap, as playthings.

i've got the MJK, U and H baffle frames but i'm not 100% on how to use/sim it for comparison to my other bodged efforts.
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