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View Full Version : Determining Port Area

Slo_Ride
08-02-2006, 07:47 PM
What determines how much port area a certain subwoofer needs? :help:

PSturmer
08-02-2006, 07:49 PM
i would guess cone area and excursion

mobeious
08-02-2006, 07:59 PM
usually for a daily loud car you can't go wrong with 10sq per 1cube

Slo_Ride
08-02-2006, 08:07 PM
So for two 15 L7's in 10 cuft @ 35 hz, 100 sqin of port? I thought more, don't know why or anything but that's why I asked.

xluben
08-02-2006, 08:07 PM
air speed:

http://www.carstereo.com/help/Articles.cfm?id=4

minimum port area calculator:

http://www.carstereo.com/help/Articles.cfm?id=31

port area shouldn't have as much to do with box volume as the driver's you're using. for most 12" driver's i think 25 sq in of port is considered safe. also remember that rounded edges (aeroports) will lower air speed, but changing the dimensions of the port will increase air speed (skinny ports = bad). you can try downloading winisd, and it will calculate port air velocity for your specific driver/box/port.

xluben
08-02-2006, 08:14 PM
what's the xmax on those things????

does kicker not post it?

Slo_Ride
08-02-2006, 08:17 PM
what's the xmax on those things????

does kicker not post it?

16.1mm

xluben
08-02-2006, 08:40 PM
i don't know what equation this site uses, but it thinks you need close to 150 sq in of port:

http://www.subwoofertools.com/forum/ported-box.asp?Ew=32&Eh=20&Dia=10&Xmax=16.1&Vd=.2&NumW=2&Vb=10&Fb=35&Qts=&Vas=&Fs=&CE=0

Slo_Ride
08-02-2006, 08:48 PM
Thanks man, I appreciate the help.