Aero Ported VS Slot Ported
Souldn't have to give you the box volume. But 2-4" ports @ 24" long tunned to 30Hz = 2.8cu/ft if you do the math. But that doesn't matter, all I want to know is what problems you will run into with a port over 20"?
1000 Watt CAFz'r
Joined: Mar 2004
Posts: 1,093
with more than 20inches is most ports, it can be too long for the waves to properly enter/exit the ports. by the time the woofer full excurts, and comes back, the air in the port hasn't had enoug time to travel in/out of the port(s)... also creats port noises, and a HUGE thing with longer ports is port flex/movement. they flex like crazy, and when they do that, that means they can be altering tuning 
Livin Loud
Livin Loud
1000 Watt CAFz'r
Joined: Mar 2004
Posts: 1,093
Originally posted by aneonrider:
No port flexing with slotted ports [img]smile.gif[/img]
No port flexing with slotted ports [img]smile.gif[/img]
you have to make sure they are nice thick well-supported/braced ports so the don't flex..Livin Loud
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IMO 20" as my "limit" for length gives me lots of cushion to what may be audible resonance in the pipe.
What I meant by "there is a problem" is that if I am calculating vent lengths over 20" or so the box must be:
1) too small
2) tuned too low
3) have too much vent area (which may not be negotiable depending on the driver)
or a combination of the three.
What I meant by "there is a problem" is that if I am calculating vent lengths over 20" or so the box must be:
1) too small
2) tuned too low
3) have too much vent area (which may not be negotiable depending on the driver)
or a combination of the three.
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Gurry
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Mar 7, 2011 06:27 PM
