need help with round port

[the Answer 10+ year member]

this is my first round port design. im using winISD and i need to know how long to make the ports. the box is for a friend, it is 13ft^3 @ 30hertz. im thinking 4 6" areos

Precision Port 6" Flared Port Tube Kit | Parts-Express.com

on winISD, it says vent lenght is 21.15", now do i divide that by 4 and each port will be 5.2875" long?

need help. thanks.

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[Bumpin' Goalie 10+ year member]

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This will help. This is that companies exact calculator.

 

[the Answer 10+ year member]

ive already look at that, but does that mean each port needs to be that long or do i divide by 4?

 

[nateberrier 10+ year member]

you would have to figure out your port area as you cant just do 6x4 for the port area. Find the area of each single port, add it together and then find out what the approx diameter of port with that much area would be. then get the length.

 

[marcotheclepto 10+ year member]

length is each. not between all 4

 

[ahole-ic]

length is each. not between all 4

This is exactly right. DO NOT JUST DIVIDE BY 4!!!

 

[perfecxionX 10+ year member]

what is the box for? you dont really want to determine port area based just on enclosure volume

 

[Bumpin' Goalie 10+ year member]

what is the box for? you dont really want to determine port area based just on enclosure volume

Using displacement can be more helpful.

And the length shown is for each port.

 

[the Answer 10+ year member]

thanks to all. it is for 2 18" DC lvl 4s maybe with lvl 5 coils. i also read that u need 7-9 square inches of port per cube with round ports. any more help? or any rocommended ports? size?