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Old 07-22-2009, 10:54 AM
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Default How much port area?

I've been wondering how much port area is too much? Is there such a thing?

I have 3 12W6v2's in 3-1.5 cube boxes (after displ.) tuned to 32hz each. Currently the port area is 18.125"sq. ... 14.5" x 1.25. I was thinking of taking the ports to 14.5 x 2" or 29"sq. What are the noticeable benefits of doing such?

How much port area should I be considering? I want to stay in the 32hz range so it can't be HUGE, this is for a daily enclosure in my Windstar. Current enclosure in Avitar...

Thanks for every ones help,
Paul
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Old 07-22-2009, 10:55 AM
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I can sit in my port area
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Old 07-22-2009, 11:00 AM
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I was running 90" of port with two se 12's...
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Old 07-22-2009, 11:11 AM
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Originally Posted by Dyn0miteMat View Post
I was running 90" of port with two se 12's...
Really, so 29" each would be good?
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Old 07-22-2009, 11:13 AM
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Does Vb play a factor at all? Smaller Vb = smaller port area?
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Old 07-22-2009, 11:21 AM
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Originally Posted by money_inc View Post
I can sit in my port area
NICE! How many subs? What size? A buddy of mines running 4 15's in a wall, you can actually climb through the port into the enclosure. Crazy huge.
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Old 07-22-2009, 11:25 AM
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ill go take a pic
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Old 07-22-2009, 11:27 AM
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The rule of thumb is 12-16in^2 of port per cubic foot of net vol. So for 1.5ft^3 net it would be 18in^2-24in^2 of port.

That is just a guideline though. SPL applications use more area usually. The thing you have to remember is that there is a point where it gets to be too much port area and you lose a lot of cone control and mechanical power handeling.
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Old 07-22-2009, 11:29 AM
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Originally Posted by money_inc View Post
ill go take a pic
THANKS! I like pics.
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Old 07-22-2009, 11:37 AM
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Quote:
Originally Posted by SPY View Post
The rule of thumb is 12-16in^2 of port per cubic foot of net vol. So for 1.5ft^3 net it would be 18in^2-24in^2 of port.

That is just a guideline though. SPL applications use more area usually. The thing you have to remember is that there is a point where it gets to be too much port area and you lose a lot of cone control and mechanical power handeling.
Great info! Thanks! I've got hardly no excursion right now and more power than their coils can handle... I've had to turn my gains all the way down, and use 6 db of boost at 31hz (almost port frequency) to get them moving enough to cool them a little.... no boost equaled hardly no movement.

What do you think SPY? Honored to have you grace my thread BTW... I've got no problem building another enclosure, only thing is space. 9 cube total space is all I have.
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