Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 100 - diyAudio
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Old 11th July 2006, 01:06 PM   #991
zek is offline zek  Serbia
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Please someone (Scott, GM, ..) to post the formulas how to calculate L (Line lenght), So (Driver down) and Sm (Terminus area) for BIB sims.

Thanks in advance.
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Old 11th July 2006, 08:47 PM   #992
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I know this is the fullrange section but....

How would this model?


Fostex 8 WOOFER
Hybrid pulp cone
8 ohm impedance
90db sensitivity
Frequency response from 29 Hz to 5 kHz
Flange 230 mm
Cut-out 182 mm
Depth 94.8 mm

Znom 8 ohm
Re 5.8 ohm
Le@1kHz - mH
fs 29 Hz
Qms 13.2
Qes 0.21
Qts 0.20
Mms 40 g
Cms - mm/N
Sd - cm2
BL - N/A
Vas 43.4 ltrs
Xmax 6.5 mm peak
VC 81 mm
Sensitivity
1W / 1m 90 dB
Nom. Power 100 W

Since the BIB is a simply a horn how about using it for bass and then add an outboard FR driver.
Freeing up a full range driver from the bass duties only helps I have found.

Andrew
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Old 11th July 2006, 09:32 PM   #993
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Default Its a start Fe108 sigma

The cab is for the 108 sigma.
I cut the front from a two inch thick peice of maple. Then cut rabbits on either side to recieve the 3/4" birch ply.
The inside measures are 4.5" x 7.5". The divider is placed at 3.75"
This box is seriously strong.
The box is 44 inches tall.
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Old 11th July 2006, 09:34 PM   #994
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Default Fe108 sigma

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Old 11th July 2006, 09:36 PM   #995
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Default FE 108 sigma

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Old 11th July 2006, 10:08 PM   #996
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Phil, that looks way cool. Will you add the thick wood to the back as well or just leave it as is?
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Old 12th July 2006, 12:17 AM   #997
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Default FE108 Sigma

The back "ears" will stay as they are.
I like the sides of the cab to extend beyod the back.
Three reasons:

One: The added extension adds to the overall strenght and rigidity.
Two: Any slight missmatches won't matter.
Third: The overalll shape looks better.
I shape the back edge in a bow so that it has a nice gentle curve...It looks nicer than a straight line.

The 2 inch thick maple front is overkill but then it's what I had in the parts bin.

The top will be fitted with a kinda crown molding and a "grill cloth".
Because the speaker is well below the ear level I'm thinking some kind of bottom treatment to get the box up in the air. Legs or some box with sand. I'm leaning to legs since this thing is HEAVY and the sand (weight) is not really needed.

The bottom will be more of the 2" maple cutoffs.

Finish: Rubbed on spar varnish. Three or four coats.
Wiring: 28 ga. cotton covered soild silver wire. (Matches the rest of my amps and preamp)
Connectors: Lemos. Love them Lemos for everything!

I'll finish the boxes next week and mount the drivers. The sigmas have been in daily use for about six months so they are well broken in.

Next Project:BIB Lowther DX3...YEA!!!
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Old 12th July 2006, 12:19 AM   #998
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Default Who will make the 1000th post????

nt
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Old 12th July 2006, 03:19 AM   #999
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Phil- Which type of Lemo's are you using.

WOOT post 999

Sean

I don't think I have ever said WOOT before, but it seemed appropriate
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Old 12th July 2006, 04:17 AM   #1000
Nanook is offline Nanook  Canada
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Default I guess I'm "it"

Why so much discussion about this? it seems that the mathematics and theory are pretty well known... Perhaps someone could summarize the 1000 posts into a cd or archive. Let's see if there's something else out there.....

No dis to Terry Cain, intended, but even he has moved on...
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