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  #1  
Old 03-09-2012, 09:13 PM
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Default port area...

do i figure my final port area before or after all my displacement? Im like 99 percent sure its after...
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Old 03-09-2012, 09:18 PM
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port area is merely the size of your port. displacement won't change anything
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Old 03-09-2012, 09:19 PM
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port area should be after
port length also plays a role in enclosure volume
port area affects port length

try using a calc to help you, or search your sub to see what other people are using that works
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2 sa Zv1's 5.8cf tuned to 48 or 32 with port plugs
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Old 03-09-2012, 09:20 PM
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If your box is 5 cubes gross volume...and your port volume is 1 cube, your total enclosure volume would be 4 cubes. Is that what you were asking?
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Old 03-09-2012, 09:27 PM
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he is going by the "rule" 10-16 sq in of port per cf
many subs dont follow that "rule" which is why i said search to see what others have found to work well.
OA 12's work well in 1.5-2cf with 12-18sq in of port, that 6-9 per cf

also the larger you make your port the longer it has to be to lower tuning


a quote from csco

-------------------------------------------------------------------------------------------------------------------------

1.5 ft^3 is the smallest enclosure size we recommend for a vented subwoofer system but it will work well.

You can also see this post that I made a few threads down, "With smaller surface area ports you can A) gain larger bandwidth from the subwoofer/enclosure system interaction of the port mouth area to the driver(s) being used, B) utilize all of the port surface area due to it not being gigantic, C) actually fit the port inside the enclosure. Larger surface area ports can be beneficial for high SPL scores tuned higher (ie, not 30 Hz) since the entire port mouth is able to be utilized from the power and the higher motor force drivers being used."

from the obsidian man himself. also
--------------------------------------------------------------------------------

I don't know where the idea of X in^2 per ft^3 started but it isn't a very good ideology to follow. If that were the case a single port for a single 12" driver in 3 ft^3 would be 36 in^2 for 12 in^2 per 1 ft^3 which is a 3x12" port...and good luck fitting it inside the enclosure due to the port length required. That's a huge port for a single 12"! Most drivers out there can't excite that huge port area, so that huge port is wasted for the most part. Simply stick with 12 in^2 to 18 in^2 per 12" driver and you will be fine.
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Old 03-09-2012, 09:29 PM
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Ahh...in that case...if you are firing the ports into a cabin at the front seats...I like smaller area. If you are in a trunk...or the ports are firing to the rear or side I like larger port area.
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Old 03-09-2012, 09:31 PM
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Do I figure out my port area after port displacement?

Say i have a four cube box and one cube of port do i figure my port area for four cubes or three?

say said port is ten tall and 4 wide that gives me 8 sq inches of port per cube

if i figure it after displacement it gives me 10 sq in per cube.

Which is the right way to figure it?

Yes I realize that isnt enough port area and all numbers are hypothetical to better explain my question. Hahahaha didnt want some one hitting the floor thinking i was doing 8 sq inch of port per cube hahaha
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Old 03-09-2012, 09:44 PM
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re-read my post, port area is driver dependant.....

if you put a sub that is geared for sealed aplications in a ported box with 16sq in of port per cube, it will play like aaaaaaaasssssssssss

many subs just dont have the power to excite a port that large, so like i said OA 12's do well with 6-9 sq in of port per cf

do a search of your sub to see what others have done that preformed well

and if your box is 4cf and you decide you want 40sq in of port you will need to adjust the length of the port to get the tuning you want, while adjusting your net volume for the area the port is taking up.
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Old 03-09-2012, 09:49 PM
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Still not anwsering the original question! Hahaha do i figure port area of my enclosures gross or net volume?
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Old 03-09-2012, 09:52 PM
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net......

if your enclosure fails, you will know you didnt listen when you should have
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