BIB DRIVER PLACEMENT n' others - diyAudio
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Old 6th November 2006, 11:07 AM   #1
herpaw is offline herpaw  Argentina
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Location: buenos aires
Question BIB DRIVER PLACEMENT n' others

hi everyone,
as a pair of fe167e are on the way, Iīll load them with a BIB.
I wonder if placing the driver a little lower than is recomended in the zillapage would give any benefit, say around 40'' from the floor.
No quality ply available, so it's mdf or particle, which one?
last but not least, has anyone runned them with an unmodded
t-amp ?, is the rolled off bass of the t, enough to mess with the horn loading?
thatīs all, thanks

hernan
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Old 6th November 2006, 11:58 AM   #2
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An unmodified T won't go low enough (as I understand it) -you'll need to tweak it to prevent the amp rolling off below 100Hz or so.

Lowering the driver by 1/4 of an inch won't affect the response enought to cause problems (assuming a 68in tall cabinet it's 40.25in from the floor as suggested).

I've used MDF -worked fine for me. The internal baffle braces the sides so there is much less vibration than you'd normally get, though it would be a good plan to double the front baffle. For a tweak, try MDF front baffle and side panels, and a rear baffle and internal baffle using chipboard (particle board). That's what I'm going to try for my next pair anyway. Makes it a very inexpensive build too.
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Old 6th November 2006, 01:51 PM   #3
herpaw is offline herpaw  Argentina
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thanks Scottmoose,

Excellent idea, mixing mdf and chipboard!! Gonna try it that way!!
so i''ll just have to mod the little thingy, the other day i opened it,
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Old 6th November 2006, 01:52 PM   #4
herpaw is offline herpaw  Argentina
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sorry as i was saying,
opened it and was shocked at the tiny size!, maybe i'll just use
a 40watter SS with slim gauge speaker cable, well first I have
to make the box anyway.
bye
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Old 7th November 2006, 03:07 AM   #5
holdent is offline holdent  Canada
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I tried modelling the BIB for the FE167E using the dims posted at Zillaspeak but found the best frequency response was to have the driver at 29.5" down from the top rather than the 27.5" posted (a typo?). However I might be doing something wrong because I don't quite get the resp. shown for 27.5". [I'm using an E=0.2169 (or 29.5in), So=0.001, Sl=4.2662Sd (or mouth area of 87.75in2 with an advertised Sd of 132.7cm2)]. Hopefully Scottmoose can comment!
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Old 7th November 2006, 10:05 AM   #6
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Use ML TQWT, not TL offset driver. Width is as per usual. So depth=0.125in, Sl depth = whatever necessary to get the correct terminus area you require. Vent length=0.0001in, vent diameter =terminus area / 3.1416^0.5 That'll get you the advertised response.

Some of the driver positions look a little unusual because I'm aiming for a particular shape below 100Hz. In the case of the 166E/167E/166ES-R I simply retained a standard cabinet rather than optimising for a specific driver so people could indulge themselves in a little driver rolling. In this throw-away day & age, I thought it might be both economical, and fun. If you use clip on tabs rather than soldering connections, you can swap out drivers for specific music or evenings for example. Just a thought.

I really should do a proper generic BIB at some point for those who fancy the ideal of driver-rolling on a wider scale.

Best
Scott
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Old 8th November 2006, 11:43 AM   #7
gychang is offline gychang  United States
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Default Re: BIB DRIVER PLACEMENT n' others

Quote:
Originally posted by herpaw
hi everyone,
as a pair of fe167e are on the way, Iīll load them with a BIB.
I wonder if placing the driver a little lower than is recomended in the zillapage would give any benefit, say around 40'' from the floor.
No quality ply available, so it's mdf or particle, which one?
last but not least, has anyone runned them with an unmodded
t-amp ?, is the rolled off bass of the t, enough to mess with the horn loading?
thatīs all, thanks

hernan
would like to see the result, pictures when completed, I will be running mine with T-amp clone, amp6BASIC.

gychang
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Old 8th November 2006, 01:33 PM   #8
herpaw is offline herpaw  Argentina
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Join Date: Apr 2006
Location: buenos aires
hi gychang

ok i'll put out some pictures when i'm done, maybe of the process too, the location of the driver will be the standard, i confused the Zdriver distance,(thought it was the distance from the center of the driver to the edge, then up to the top), and proposed a height that was almost the same as the suggested one.
I'll finally go cheap, chipboard BIB on the way!!!, with a MDF base.

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Old 8th November 2006, 01:45 PM   #9
gychang is offline gychang  United States
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Quote:
Originally posted by herpaw
hi gychang

i confused the Zdriver distance,(thought it was the distance from the center of the driver to the edge, then up to the top), and proposed a height that was almost the same as the suggested one.
I'll finally go cheap, chipboard BIB on the way!!!, with a MDF base.

I will start my 2nd BIB for upstairs. my understanding of Zdriver distance is from the center of the speaker...

gychang
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Old 8th November 2006, 01:47 PM   #10
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Correct. Zdriver is the distance of the centre of the drive-unit to the sealed end of the line.
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