can someone figure a port out for me?

[kicker 10+ year member]

ok i have a sealed box at the moment but want to port it,for 2 twelves, kenwood KFC-W3009, i cant figure out how long and wide a slot port should be and or t/s par for the subs. the measurements: 15"h 11.75"d 38.5w. thanks

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[Cabin_Pressure 10+ year member]

Those overall dimensions? You use 3/4" material?

 

[themgators511 10+ year member]

What kind of tunning are you looking for? I can design a box for you if needed.

 

[kicker 10+ year member]

Those overall dimensions? You use 3/4" material?

yeah its 3/4 mdf

 

[Cabin_Pressure 10+ year member]

What do you want to tune to?

 

[kicker 10+ year member]

What kind of tunning are you looking for? I can design a box for you if needed.

around 30hz or 32hz and that would be great but im just messin around with the box i already have for the fun of it lol

 

[Cabin_Pressure 10+ year member]

around 30hz or 32hz and that would be great but im just messin around with the box i already have for the fun of it lol

Gonna have to port it out the side if you want to go that low because of port length, or tear it apart and build a L-shaped internal port inside it. It would be easier to add (2) 3'' tube style ports. Where do you want it ported...................front, side, top.......?

 

[kicker 10+ year member]

Gonna have to port it out the side if you want to go that low because of port length, or tear it apart and build a L-shaped internal port inside it. It would be easier to add (2) 3'' tube style ports. Where do you want it ported...................front, side, top.......?

well tube ports would be ok it doesnt rly matter, how long would 3" round ports need to be? o and is that i.d. or o.d.

 

[Cabin_Pressure 10+ year member]

well tube ports would be ok it doesnt rly matter, how long would 3" round ports need to be? o and is that i.d. or o.d.

~13" long for 31-32Hz and that is I.D.

 

[kicker 10+ year member]

ok, thats 13" each right? sry im new to porting boxes lol

 

[Cabin_Pressure 10+ year member]

ok, thats 13" each right? sry im new to porting boxes lol

no problem and yep that's each

 

[RAM_Designs 5,000+ posts]

Box is too small, don't even bother...just build a new one.

 

[kicker 10+ year member]

Box is too small, don't even bother...just build a new one.

too small? its huge for a down firing center console in a 90 c1500, just wanted to try ported only got like a $100 in the whole mess thats hu, subs amps and speakers lol

 

[RAM_Designs 5,000+ posts]

You have 2.96ft^3 before sub and port displacement. You need at minimum 3.75-4ft^3 after sub and port displacement.

Box is too small, start over. If you want to try ported, then do it right or you might get a bad impression because of a bad box.

 

[SpeedEuphoria 10+ year member]

You prob want at least 2x 4" round ports, which will have to be ~21=22" long

But as Ram said the box is small, figuring around 2.75cubes after sub displacement. Most shoot for 3.5-5 cubes volume for 2x 12" subs depending on what kind they are.