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quick port question

Old 06-11-2006, 11:33 AM
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quick port question

for one 15 what would be better one single 4 inch port or 2 3 inch?
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Old 06-11-2006, 07:31 PM
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IMO I think you'll need more port area...a slot type port would be easier to fit a bigger port.

But to be sure, there are a couple of factors that determine the necessary port area. i.e. What sub? Size of enclosure? Tuning? Power?
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Old 06-11-2006, 09:07 PM
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I dunno a lot about boxes, but from what I do know, you're gonna want two 6in. ports or four 4in. ports.

The big SPL boys are running that kind of setup...

And I just built a new SQ box, with dual four's. They're so long, they're half an inch from the sub basket.

She's tuned to 31hz.

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Old 06-11-2006, 11:33 PM
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Lightbulb

I vote (2) 4" diameter vents or more.
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Old 06-11-2006, 11:58 PM
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pretty hard to say without knowing what speaker it is.

you can also use the more traditional way to determine the minimum port diameter.

Sd = pi*(D/100)^2/4
Vd = Sd*Xmax/1000
MinimumDiameter= 100*(20.3*(Vd^2/Fb)^0.25)/Np^.5

this is with xmax in mm, diameter in cm, Fb=resonant (tuning) frequency of port, and Np=number of ports you will use.

Last edited by xxPunk0Ramaxx; 06-14-2006 at 09:55 PM.
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