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Old 19th May 2005, 12:37 PM   #21
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Dave; I'm building an MLTQWP - Bipolar and was wondering about the necessity of a brace between the drivers.

Are you using a brace between the WR125's, and if so what does the brace do for a bi-polar design?

Pete
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Old 19th May 2005, 07:58 PM   #22
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Quote:
Originally posted by Peter Menting
I'm building an MLTQWP - Bipolar and was wondering about the necessity of a brace between the drivers.

Are you using a brace between the WR125's, and if so what does the brace do for a bi-polar design?
A brace is not necessary, but if you add it to more tightly couple the drivers the push-push effect will be greater, creating a better active vibration cancellation mechanism.

dave
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Old 19th May 2005, 08:18 PM   #23
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I say, do it. I've been very pleased with the large amount of vibration reduction in the cabinet resulting from coupling the drivers. My last bipolar build has a nearly resonance free cabinet.
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Old 19th May 2005, 08:45 PM   #24
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Thanks guys! What sort of brace do you use? The first thought that comes to mind is a 1" hardwood dowel with foam pads at each end---is that in the ballpark? Or would a spring loaded device be better?

Pete
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Old 19th May 2005, 09:18 PM   #25
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Quote:
Originally posted by Peter Menting
Thanks guys! What sort of brace do you use? The first thought that comes to mind is a 1" hardwood dowel with foam pads at each end---is that in the ballpark? Or would a spring loaded device be better?
You want maximum rigidity... hardwood is good, the foam only if it squishes down to nothing. An aluminum bar would be better (but usually not ready to hand)

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Old 19th May 2005, 11:08 PM   #26
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Quote:
Originally posted by planet10

You want maximum rigidity... hardwood is good, the foam only if it squishes down to nothing. An aluminum bar would be better (but usually not ready to hand)
I have been having a hard time trying to visualize this. Does anyone have any pictures? Is the bar just glued to the back of the speaker?
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Old 20th May 2005, 01:45 AM   #27
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http://www.t-linespeakers.org/projec...construct.html
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Old 20th May 2005, 02:10 AM   #28
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Quote:
Originally posted by GG
I have been having a hard time trying to visualize this. Does anyone have any pictures? Is the bar just glued to the back of the speaker?
Here is a brace hot glued to one driver:

Click the image to open in full size.

This is the view before the brace added, but gives you an idea of the layout of the box

Click the image to open in full size.

dave
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Old 20th May 2005, 02:21 AM   #29
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Some more from TLS.org...

http://www.t-linespeakers.org/FALL/bipolar/index.html

click on the pics to get full plans

Click the image to open in full size.

and a gone nuts coupling -- partially possible because the driver was designed to be bolted to the back of the cab:

http://www.t-linespeakers.org/FALL/push-push.html

Click the image to open in full size.

dave
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Old 20th May 2005, 02:36 AM   #30
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Thanks Dave---I think I'll go with the dowel !

Pete
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