How much port area?

[trigger2008 10+ year member]

What is the minimum port area that I need for a box that is 5 cubes tuned at 30 htz.

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[jalverson 10+ year member]

here is a link to one of moe lesters plans.

http://img35.imageshack.us/my.php?image=5cubes32hz62sqin6hk.png

its for a box 5cu/ft tuned to 32hz should be close to what ya need check it out. also see his post at the top of the Box Construction and Fiberglassing Help forum.

 

[trigger2008 10+ year member]

so would that be the minimum I can use for the port

 

[jalverson 10+ year member]

what sub/s are you running?

 

[trigger2008 10+ year member]

Two 12 L7

 

[jalverson 10+ year member]

i would either go with the plan i gave you a link to or contact PV Audio, or saywhat? for a design more specific to your needs.

 

[trigger2008 10+ year member]

I already have the plan that I have done up. It is kind of coplicated I just want to make sure that I am not going to have port noise. The port area I have is 50 sq inches just want make sure this is enough.

 

[jalverson 10+ year member]

ahhh i see. not 100% sure like i said contact saywhat? i think he s on right now he will be able to help u out more.

 

[DFW40 10+ year member]

As long as you have about 20 inches per sub you will be fine. I always like to keep a ratio of about 6 to 1 on the slot ports....in other words if the port is 6 inches high then it should be 1 inch wide and 12 inches high and 2 wide etc. You don't want a port that is 50 inches in length and one inch in width. The smaller this ratio the less chance of port noise.

 

[DBfan187 5,000+ posts]

8:1

5.3cF with 75sq.in. of port @ 35Hz

 

[trigger2008 10+ year member]

Thanks for all the info

 

[luv2bass 10+ year member]

air speed in port shouldn't exceed 17m/sec which is speed of sound.over this it will be audible.

larger ports lower the speed but need more airspace.

you can checkout with winisd.