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Bracing for dipole subwoofer
Bracing for dipole subwoofer
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Old 13th September 2018, 04:05 AM   #1
shrub0 is offline shrub0  United States
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Default Bracing for dipole subwoofer

I am building a modified w-frame dipole subwoofer. It is made to go in the corner and is based off an audioxpress article from 2004.

The original plans did not have any bracing and I noticed that the linkwitz dipole has no braces.

However I am thinking of connecting the panels internally with a length of 2”x2” hardwood. Are there any cons to this approach? Can’t fit a window brace

I’m also considering adding strips of wood on the outside to raise the frequency of panel resonance. Any thoughts on this? See pic
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Last edited by shrub0; 13th September 2018 at 02:29 PM.
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Old 13th September 2018, 03:23 PM   #2
shrub0 is offline shrub0  United States
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Plan view picture of bracing.
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Old 13th September 2018, 03:31 PM   #3
scottjoplin is offline scottjoplin  Wales
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Hi. Mmm, I don't understand, the top and bottom will give all the bracing it needs.

Can you link to the original article? I'm intrigued by the idea of a corner dipole
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Old 13th September 2018, 04:04 PM   #4
shrub0 is offline shrub0  United States
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Not really sure if I should share audioxpress articles but since it's 14 years old no one will probably mind.
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File Type: pdf DoubleDipole2of2.pdf (452.3 KB, 35 views)
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Old 13th September 2018, 04:05 PM   #5
shrub0 is offline shrub0  United States
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Yes the top and bottom panels are inherently well braced but the side panels definitely ring out with a knuckle pound.
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Old 13th September 2018, 07:56 PM   #6
TBTL is offline TBTL  Germany
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Dipoles don't work in corners. You can think of them as velocity sources. A velocity normal to a wall is not possible.
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Old 13th September 2018, 08:12 PM   #7
shrub0 is offline shrub0  United States
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That may be true, but it worked for the original author. Worst case, I can pull it away from the corner.

However, I am looking for advice on bracing the cabinet walls for minimal vibration.
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Old 13th September 2018, 08:22 PM   #8
scottjoplin is offline scottjoplin  Wales
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Yes, brace away, however it's only necessary to raise the resonant frequency sufficiently above the crossover point. There is mention Linkwitz's site of a corner dipole. I would be interested to hear your results
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Old 18th September 2018, 09:46 PM   #9
academia50 is offline academia50  Argentina
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Interesting project, I think that if we use the right speakers for an OB, it has to work very well.

I was thinking whether to abandon my idea of building 2 sealed subwoofers and build something like that ....

Will my speakers serve for this purpose?

EBP is 84 .... this is suitable for both BR and sealed ....

http://www.eminence.com/pdf/Delta_Pro_18A.pdf
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Old 19th September 2018, 10:18 PM   #10
shrub0 is offline shrub0  United States
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Those Eminence woofers have a low QTS, so open baffle is an option, but would require a lot of EQ.

It depends on what your goal is, you will get more boom from a vented cabinet but better articulation and sound quality from an open baffle design.

I don't have a lot of free time so it might be a month or so before I can give a report on how this corner dipole design sounds.
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