How should I decide port aera?

[n8ball2013]

so you bump it every half hour expecting an answer? be patient. Doesnt kicker recommend tuning to like 42hz too?

[CJ18]

I think the more port you can fit the better. I personally like 15-18 in2 of port area per ft3. You want to figure your port area and tuning based on you net volume, which is the volume after all displacements.

[Black Viper]

I like going by the XMAX. I have 14^2 of flared aero port per cube for my 12 and it loves it. Used the crappy rule of 7-9 per cube for aeros and it lost a shitload of sound and had so much damn port noise I didn't want to listen to it. This will get you a ballpark answer

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

But you can find the actual equations on diysubwoofers.org

I am wanting to properly vent a Alpine Type R1242D, and the data sheet gives you all the info you need for create it. Are the specs provided any good, if I am trying to vent it for both SQ and mid SPL? Have I selected a crappy sub to do perform this task?

[EricR]

Larger ports are generally louder but more peaky, smaller ports are able to play a larger bandwidth.

If you have 14 cuft I would suggest no less than 170 sqin of port.

[FreekDesignz]

so you bump it every half hour expecting an answer? be patient. Doesnt kicker recommend tuning to like 42hz too?

I figured it out from pg 2 on here...

http://kicker.com/sites/default/files/2008SoloBaricL5.pdf

[wL<3bass]

I usually use 14-20sqinches for my rule... Sometimes more than 20 is applicable.

[fecupe2001]

Very nice responds from everybody, yes i´ve tried the whole xmax formulas and let me tell you, i prefer going by trial and error, just get a big ass port and start shrinking it until you find the sweet spot, my DD 2512´s have a big xmax wich results on a big port?? well, that´s according to formulas, but in the real live i got something way different, of course, every system and car it´s different, but hey, i ended up with 16 SQ per cubic feet, while my 1510´s sounded better with 18 SQ per cubic feet and a smaller xmax haha, or better yet, when i tried a single 3518 (same xmax than the 2500 series) i ended up with 20 SQ per cubic feet ON AEROPORTS!!!

Anyways, that´s why we love car audio

[FreekDesignz]

The most I can do is 14.11in^2 per ft^3. I'm to be loud at 21-35Hz I wouldn't be playing very much above that

[fecupe2001]

14 SQ per cubic feet sounds nice on every sub on earth i think haha, should be more than enough hommie

[n8ball2013]

I am wanting to properly vent a Alpine Type R1242D, and the data sheet gives you all the info you need for create it. Are the specs provided any good, if I am trying to vent it for both SQ and mid SPL? Have I selected a crappy sub to do perform this task?

then start your own thread and not thread jack.