Port length and air speed?

2237 Views 10 Replies 7 Participants Last post by DrDyna, Sep 26, 2012

JWieczorek

Discussion Starter · Aug 14, 2012

Hello,

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.

Joe

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ach81090

· #5 · Sep 9, 2012

I don't understand why people are still using MDF. Cabinet grade pine is about the same price, but half and weight(more important for car audio), twice the strength, and easier on blades. Birch is even stronger, but more expensive. Use good material and common sense, you won't have to go too crazy with bracing and multiple baffles.(I'm not saying don't brace at all)

Good luck with the build!

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ach81090

· #7 · Sep 11, 2012

fusseli said:
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

Sure, but depending on the specific application, it is likely that the benefits of a more rigid enclosure will more than make up for the lower density of the wood. I've used MDF for years, but never again if I can help it.

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