quick port question
for one 15 what would be better one single 4 inch port or 2 3 inch?
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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? |
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. http://www.allstart.net/SQBox/images/IMAG0008.jpg |
I vote (2) 4" diameter vents or more.
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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. |
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