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Old 16th February 2012, 03:24 PM   #4961
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Quote:
Originally Posted by mlwalla View Post
Thoughts?
All sounds good to me except for the ceiling loading since once a reflective surface moves away from the perpendicular, loading rapidly decays away same as room modes [AKA 'slap' echo] will when angled away from the sound wall, so probably not enough loading to matter. Best then to floor load. This is easy to test, just tilt a speaker back and by about 12 deg the bass should have rolled off considerably.

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Old 11th March 2012, 08:59 PM   #4962
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This very interesting thread made (forced) me to buy 250 lbs of plywood yesterday.

I know this is about fullrange drivers but since its a BIB i hope this is a good place to show it.

Click the image to open in full size.

Click the image to open in full size.


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Old 12th March 2012, 04:38 AM   #4963
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Johannes,

We await to see your progress. The BIB is infectious. I am a builder of this design
and it has been very satisfying. The BIB thread has lots of ideas in it. I've tried many.

New entries in this original BIB thread for Terry Cain are always appreciated.
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Old 13th March 2012, 02:22 AM   #4964
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Originally Posted by Circlomanen View Post
I know this is about fullrange drivers but since its a BIB i hope this is a good place to show it.
Yes, wish all the various BIBs were in this thread, then [re]searching would be a 'breeze' using the thread search feature.

Note that the folded horn is a little short for typical ceiling loading, so you may need a 'tophat' to extend it higher to somewhat mass load it if you have problems with too much excursion.

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Old 13th March 2012, 04:41 AM   #4965
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Quote:
Note that the folded horn is a little short for typical ceiling loading
I made the horn a little bit longer. It simulated really good at 72 inch high.
I think my drivers can take that without problems. They are high power PA-drivers with good xmax and powerhandling.


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Old 13th March 2012, 05:16 PM   #4966
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Just had a thought. If i knew the ts parameters of the 5 1/4" midwoofer in my DM302 i could build a bib if it was suitable.

but it might just be as easy to buy some drivers and build a bib for them.

I searched this thread for a formula to design one of these but to no avail.

Can someone point me to such a formula, cant seem to find one anywhere.

Btw im doing all this from a motorola droid 3 cellphone so my browser is not the usual firefox/ie fare.
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Last edited by Etocynned; 13th March 2012 at 05:21 PM.
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Old 13th March 2012, 06:02 PM   #4967
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I'm sure someone else will chime in on this, but if you know the TS parameters there is a BIB calculator which can be used with Excel or Open Office spreadsheet programs.

Jeff (Zilla) or others can give specifics.
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Old 13th March 2012, 06:32 PM   #4968
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Ya been to zillas site but link to calculator doesnt work for me.

hrm? Maybe an email of the sheet itself attached?
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Old 13th March 2012, 08:10 PM   #4969
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Originally Posted by Etocynned View Post
Ya been to zillas site but link to calculator doesnt work for me.

hrm? Maybe an email of the sheet itself attached?
Yes I saw yesterday that Z' was having some problems at expects things to get righted soon. Any of us should be able to attach the .xls file. I use Open Office free desktop suite and it loads fine for me.

I have the iteration called BIB Calculator V1. Others could say if later versions are available from them.

lon@athenet.net
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Old 13th March 2012, 10:56 PM   #4970
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Email me and i will send you the BIB Calculator

ZillaSpeakers@gmail.com
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