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need help with port area


bassaddiction

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There is a formula you can use to calculate port area but a good rule of thumb for high excursion woofers is 16in² per cubic foot, which is roughly what you have.

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so i did it right ????? lol wtf is port area, why is it 40 i was told it had to be 25 is that right

Port area is the surface area of the port. If you have a 1" x 1" square port, you have 1in² of port area. Likewise, if you have a 10" x 10" square port, you have 100in² of port area.

Port area is important because with too little port area, you will have port noise because the vent won't be able to evacuate/take in enough air when it is playing. If you have too much port area, you lose acoustical suspension and risk damaging the subwoofer.

I don't know who told you 25in² of port area and I don't know what they were basing that number on so it's impossible for me to say you were given good or bad info. It could very well have been exactly what you needed for a given sub/box.

EDIT: And the reason why you have 40.5in² of port area is because 3*13.5=40.5

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Here are the formulas you should use.

http://www.carstereo.com/help/Articles.cfm?id=21

http://www.diysubwoofers.org/misc/portcal.htm

You should need around 75 in2 of port area for that sub tuned to 38hz.

Also the 12-18 in2/foot is not a reliable form of determining port area, use the formulas.

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Krakin's Home Dipole Project

http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370

Krakin, are you some sort of mad scientist?

I would have replied earlier, but I was measuring the output of my amp with a yardstick . . .

What you hear is not the air pressure variation in itself

but what has drawn your attention

in the two streams of superimposed air pressure variations at your eardrums

An acoustic event has dimensions of Time, Tone, Loudness and Space

Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears,

thus no formula can achieve a definite effect for every listener.

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Here are the formulas you should use.

http://www.carstereo.com/help/Articles.cfm?id=21

http://www.diysubwoofers.org/misc/portcal.htm

You should need around 75 in2 of port area for that sub tuned to 38hz.

Also the 12-18 in2/foot is not a reliable form of determining port area, use the formulas.

thanks

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