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Port length and air speed?

2233 Views 10 Replies 7 Participants Last post by  DrDyna

I also have a Dayton Titanic 15" sub and a O audio 500 watt amp. When i put the data into WinIsd it gives a port length of 4 inches, is this right? I used the data from a link on this website. 12^3" with a 19hz tune. I will build a 24x24x36 box. On a side note: do any ported boxes need bracing? If there vented, how could there be internal pressure high enough to flex 3/4" mdf?:scratch: One more thing, I'm a little confused about port air speed. I read a turtorial and now I'm more confused. Thanks for the help.

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Lighter weight means a comparatively higher resonance frequency, bracing lowers resonance ideally below what is audible. So light weight really only saves your back when you have to move the sub. Also, MDF comes in 4'x8' sheets that can be found in about any corner of the modern world :)
Hmm. From what I remember reading, (and from a physics standpoint) bracing increases the resonant frequency of each panel above the spectrum of frequencies the subwoofer will see or produce. If you think about it, a large panel will have a lower resonant frequency than a smaller panel, so by bracing, you would actually be increasing the resonant frequency. That would also explain why boxes that aren't well braced sound "boomy"; there is some destructive resonance occurring there.
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