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Old 15th October 2007, 05:27 AM   #1
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Default BIB newbie questions

Hey guys, I just learned about the "Bigger is Better" cabinet style on these forums and thought it would be a good first project to introduce me to speaker building. I've never built a speaker cabinet, and I'm also very new to most hi-fi audio concepts and terminology, so go easy on me.

From what I've read the FE127E seems to be a popular driver, so I went ahead and ordered a pair which I plan to use in my BIB.

So I just have some questions about the basic construction.

What's the best way to cut and chamfer the hole for the speaker?

I don't really understand the function/construction of the "suprabaffle" either. I looks like it's usually just a round sheet of wood that goes around the speaker?

It's hard to find some basic newbie intro to these boxes, but I found this page showing how to calculate the dimensions for the box:
http://www.zillaspeak.com/bib-howtobuild.asp

I noticed in one place they describe Z as "Distance of driver center to top end of cabinet" but on the page that gives driver-specific dimensions, they say Z is "distance down from sealed end of cabinet". Why do they say sealed end here? Seems to me the "sealed end" would be the bottom of the enclosure.

This page also gives three options for the stuffing. What sort of material is good to use here, and what audible differences should I expect from these three stuffing options?

My living room ceiling is sloped to each side, shaped like this /\ (the slope is not that drastic though), with the TV directly under the crease. And due to the layout, I would not be able to put my speakers near the corners of the room, just along the wall. I've read that the BIB depends on the walls/ceiling to help produce it's sound. Do you think a BIB would still sound decent under these conditions?
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Old 15th October 2007, 06:18 AM   #2
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Default Re: BIB newbie questions

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Originally posted by peepsalot
I don't really understand the function/construction of the "suprabaffle" either.
Start here

supraBaffles & wavelaunch

dave
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Old 15th October 2007, 08:34 AM   #3
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I don't like suprabaffles.
They are not easy to build, the difference I can hear is not big AND they are more than just a bit ugly...but that (of course) is extremely sbjective
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Old 15th October 2007, 08:41 AM   #4
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Zdriver has nothing to do with the top or bottom of the cabinet per se. It's the distance taken from the throat of the horn (the sealed pointed end of the line) to the centre of the driver.

Damping is rather room dependant, as the room continues the horn expansion of these cabinets. I'd line the front of the sloping internal baffle and one side-wall from the throat to 6in past the driver. I'd also line the area around the bend with the same, and adjust from there to suit.
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Old 15th October 2007, 01:31 PM   #5
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Default Re: BIB newbie questions

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Originally posted by peepsalot
What sort of material is good to use here, and what audible differences should I expect from these three stuffing options?
The most common material is acousta-stuff.......
Read as more pages as you can from the original BIB thread and all of your questions will be answered! I know, there are too many pages ..........but everything is there!
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Old 15th October 2007, 02:16 PM   #6
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FYI: at the bottom of each page is a 'search this thread' window that saves a lot of time browsing large threads.
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Old 15th October 2007, 04:11 PM   #7
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Your choice of the FE127e is a good one. I built the BIB with that.

The 127e is a modest purchase for first time builder and appropriately so. I got mine years ago and am still experimenting with them in different cabinet styles.

An older thread on here is called 'the reference build' (another long one) which takes you through the whole design process with the 127e.

The measures are straightforward. Bare in mind the dimension of the wood itself of the internal baffle when cutting and gluing up.


Two tweaks work very well for me: First is the high resistance (thin wire) connects and second is the Pennant. The pennant is a right angle triangle piece of fabric suspended in the mouth of the horn. Pennant tweak was suggested by GM.

Have fun. The hobby is totally engaging.
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Old 15th October 2007, 04:26 PM   #8
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Quote:
Read as more pages as you can from the original BIB thread and all of your questions will be answered! I know, there are too many pages ..........but everything is there!
Which one is the "original" thread?
This one? Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks?
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Old 15th October 2007, 04:38 PM   #9
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Yep -I started it a couple of years back, and it's grown a bit. Like mushrooms. They'll take over the world eventually (mushrooms that is) and I, for one, think the sooner the better.
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Old 15th October 2007, 04:44 PM   #10
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>> The 127e is a modest purchase for first time builder and appropriately so. I got mine years ago and am still experimenting with them in different cabinet styles.

Me too!

Peeps... how big is your room? Any cabinet using the 127e may benefit from a powered sub if the room is large... even a BIB. Small and medium sized rooms may not need subwoofers.

The BIB tries to extract as much bass any given driver may be able to produce. It's a great cabinet choice for maximizing bass. Many who build BIBs claim it provides the most bass compared to other cabinets they've tried. It's not a perfect cabinet since it gives up smoothness in the mids (i dont mind the tradoff) but it rounds out the sound of full range drivers nicely. Corners do help the bass fill up a room using BIBs but are not mandatory... just optimal.

As for stuffing, the three illustrations are just what some have done with good results. Personally, i have just stuffed behind the driver and at the bottom of the cabinet. That's what worked for me in my listening room.
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