BIB dimensions - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > Wild Burro Audio

Wild Burro Audio DIY full range speakers from Wild Burro Audio Labs

Reply
 
Thread Tools Search this Thread
Old 11th August 2012, 09:46 PM   #1
pjanda1 is offline pjanda1  United States
diyAudio Member
 
pjanda1's Avatar
 
Join Date: Jan 2005
Location: Boulder, CO
Default BIB dimensions

I've been getting quite a few questions about BIB dimensions for the BetsyK. As I said in the "enclosures" forum, these are the dims I used:

L = (Line length) 150.5"
Zdriver = Driver 30.1" down from sealed end of cabinet
Sm = 200"^2

They are a good bit smaller than GM's formula would give you, but they had more than enough bass in my room. I wish I could remember what my exact dimensions were, but I think I used something like 11.5x17.4 WxD internal open space, which means my actual enclosures where 13" wide x 20.4" deep or so. (I used a double thickness front baffle. If you don't, you only need to add three thicknesses to get to your exterior depth). I can't remember how tall they were, but I do know that after trying to accurately calculate the height including a changing radius around the bend, it ended up being really darn close to just assuming straight lines.

hopefully that helps!

Paul
Wild Burro Audio Labs - DIY Full Range Speakers
  Reply With Quote
Old 11th August 2012, 10:46 PM   #2
opa1 is offline opa1  United States
diyAudio Member
 
opa1's Avatar
 
Join Date: Jun 2011
Location: TX.
Thanks for the thread. Trying to read through 5053 posts on the TC bib thread will give you a headache.lol Somewhere in the posts GM figured out how to sim the bibs. There is a chart for alot of drivers posted. I couldn't find a sim on the Betsy K. It seems that the design is very forgiving. Using your measurements. The height would about 78". So a internal of 12" wide and depth of 18" and 78" tall. Thats with a single 3/4" baffle. Not sure how for from the bottom to terminate the the internal piece. Placement front to back is unknown too. It could start at the top and go down to about 9" from bottom. Then center it at 9" from the back.[guessing] It would vent out the top. Maybe someone will chime in with there build.
  Reply With Quote
Old 12th August 2012, 12:07 AM   #3
pjanda1 is offline pjanda1  United States
diyAudio Member
 
pjanda1's Avatar
 
Join Date: Jan 2005
Location: Boulder, CO
Many people seem to have the bottom of the baffle equidistant from the front, bottom, and back. A more constant rate of expansion makes sense to me. Here again, I can't recall what I did. But it would have been something like half-an-inch closer to the front than to the bottom, and half an inch closer to the bottom than to the back.

Notice that with these specs, the speaker ends up pretty high. They'd be a little more difficult to deal with, but you can consider building an inverted BIB to get the driver right at ear height.

Paul
www.wildburroauudio.com
  Reply With Quote
Old 12th August 2012, 12:22 AM   #4
opa1 is offline opa1  United States
diyAudio Member
 
opa1's Avatar
 
Join Date: Jun 2011
Location: TX.
The driver would be about 48" up from bottom. I see what you mean.
  Reply With Quote
Old 12th August 2012, 12:28 AM   #5
pjanda1 is offline pjanda1  United States
diyAudio Member
 
pjanda1's Avatar
 
Join Date: Jan 2005
Location: Boulder, CO
I didn't mind the driver height, but I didn't love it either. I mention it now, as if you are going to consider inverting, it would be good to have that in mind from the beginning. There are also potential loading advantages. If you have the vents loaded with the floor, you might be able to get the speakers out from the wall a bit, which could have positive effects on imaging.

Paul
Wild Burro Audio Labs - DIY Full Range Speakers
  Reply With Quote
Old 12th August 2012, 12:43 AM   #6
opa1 is offline opa1  United States
diyAudio Member
 
opa1's Avatar
 
Join Date: Jun 2011
Location: TX.
It could be floor/side bottom vented too. I'll have to do some searching and figure the port size.
  Reply With Quote
Old 12th August 2012, 05:44 PM   #8
opa1 is offline opa1  United States
diyAudio Member
 
opa1's Avatar
 
Join Date: Jun 2011
Location: TX.
GM is quick!!

Last edited by opa1; 12th August 2012 at 05:53 PM.
  Reply With Quote
Old 12th August 2012, 06:46 PM   #9
opa1 is offline opa1  United States
diyAudio Member
 
opa1's Avatar
 
Join Date: Jun 2011
Location: TX.
Speaker specs.
Re=5.7
Fs=49.95
Sd=22.966
Bl=5.471
Qms=2.798
Qes=.548
Qts=.458
Spl=94.6
Vas=82.914L
So
L=13526.5/2/49.95 L=135.400
H=L/2 H=67.7
Vb=20*Vas*(Qts^1.25) Vb=624.692
Sl=Vb(in ft^3)*(12^3(inches in ft^3))H Sl=109.522
D=(Sl*(2^.5))^.5 D=12.4470
W=Sl/D W=8.801
Zd=l*0.217 Zd=29.381
I think my cal. on the Sl is wrong. A cab of 67.7x12.44x8.801 doesnt seem right. Where did I go wrong?
  Reply With Quote
Old 12th August 2012, 07:08 PM   #10
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by opa1 View Post
GM is quick!!
I recorded them when done for a quick reference.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
AJ-Horn & BiB - ar some BiB "parabolic"? freddi Full Range 3 6th April 2007 03:09 PM
exact dimensions of a BIB fe167e AudioGeek Full Range 15 21st January 2007 10:40 PM
Exact dimensions for BiB with 40-1354? Spasticteapot Full Range 1 24th November 2006 10:22 PM
Which BIB Dimensions for this Pair of FE164-s? DMD Full Range 20 23rd December 2005 06:02 PM
Box dimensions Vivek Multi-Way 10 16th September 2001 08:02 PM


New To Site? Need Help?

All times are GMT. The time now is 04:04 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2