questions on bracing and internal volume - Home Theater Forum and Systems - HomeTheaterShack.com

Old 01-22-10, 11:40 PM Thread Starter
Shackster
dfn

Join Date: Jan 2010
Posts: 38
questions on bracing and internal volume

If the internal dimensions of my box are 24" x 24" x 58", how much bracing do I need? Should I have bracing width-wise and length-wise? What if the internal dimensions of my enclosure are 24.5" x 28.5" x 49" ?

How do I figure out the volume of the Mach 5 IXL-18.4 driver? I saw their page for the MJ-18M driver, but it did not list the volume (the last time I checked).
dfn is offline

Old 01-23-10, 11:00 AM
Senior Shackster
Marce

Join Date: Aug 2008
Location: Weston, Florida
Posts: 159
Re: questions on bracing and internal volume

I would use shelf bracing both for the width and lenght, leave some 8"-10" in distance between each brace and you should be good.
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Old 01-23-10, 12:18 PM
Senior Shackster
Fred

Join Date: May 2008
Posts: 373
Re: questions on bracing and internal volume

Windowpane style bracing (think of a window with four framed panes) where you have a solid brace going across from center-point to center-point of opposite panels is the best. Offsetting the bracing slightly so that panels are not evenly divided is also a good idea. Each sub-panel will then have a slightly different resonance.

From memory, 12" or 14" between braces is good enough for subs. The idea is to push the resonant frequency of the panel up out of the subs operating frequency. Some simulation has been done (see link below) to show that dividing a panel in one direction is all that is needed. So, for your 24x58' panel, once brace running the 58" length would be enough. Danley labs uses this technique in their horn subs, so I would think there is some merit to the approach.

In theory, a single brace at the center-point of a panel, would effectively divide a panel into 4 smaller ones, but there is some disagreement on how this plays out in reality. I believe this is one of the things discussed in the link below.

If you want to get deeper into construction techniques including bracing, this is an excellent, but very long discussion on the topic.
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Old 01-23-10, 03:08 PM Thread Starter
Shackster
dfn

Join Date: Jan 2010
Posts: 38
Re: questions on bracing and internal volume

Wow that is a lot of info.

Thanks for the replies.

Sounds like I won't need any fancy bracing then!

What about driver volume?

EDIT: oops, NM, the driver volume is 0.2 cu ft

Last edited by dfn; 01-24-10 at 04:56 AM. Reason: found driver volume
dfn is offline

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