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How do you know what size to make the ports on vented box

 

New member
Username: Zippitta

Mulberry, Florida United State...

Post Number: 2
Registered: Apr-04
I have always used nothing but enclosed boxes because I ave been too timid to experiment with vented.

I hear that a vented box can increase spl by 3db and I would like to know how to match port sizes with the box and sub's so I dont have to worry about ruining my shizzle(dont make enough dough to be doing trial and error...lol)
How do you decide what the correct port size is?
I have 2 Audiobahn AW1200Q Thank You
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 2146
Registered: Dec-03
12" subs
4" inner diameter ports
you want the box to be 2cu ft per sub after subtracting the speakers' displacement, and the displacement volume of the port tubes (volume of a cylinder, simple geometry)

then you want one port per sub

each port should then measure:
11.4" long
4" inner diameter
your port area will be 12.566 inches^2
your port volume will be 0.083 ft^3
Port tuned freq will be 35Hz

there. all done.
make sure your box is 2ft^3 *after* adding teh subs and ports.. not before.
otherwise you end up with a box about 1.5ft^3 and the ports will be totally wrong

you'll have to get teh driver displacement yourself from Audiobahn's spec sheets
 

Bronze Member
Username: Southernrebel

Louisiana USA

Post Number: 44
Registered: Mar-04
i dont recommend using a port any smaller in diameter than 3"...the diameter of the port, sud displacement, tunning frequency, and box size all play a role in a port length.

if you wanna build one use this calculator to do so:

http://www.eatel.net/~amptech/elecdisc/spboxnew2.htm
 

Bronze Member
Username: Hiphopanonymous

Post Number: 37
Registered: Dec-03
hey glasswolf? can you calculate port measurements for me. i've tried bcae and i dunno how to work it. i have two alpine type r 12 DVC 4 ohms. i want them slot ported, so plz gimme dimensions for the rectangle ports. and i been hearing you say that 35hz is the most optimal, so that'll be nice. i don't have much room in my coupe so make the volume as small as you can if you can.
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 2157
Registered: Dec-03
if I start doing this, I'll have everyone asking me to design boxes and measure out ports for them.
I'm trying to avoid that.
 

New member
Username: Zippitta

Mulberry, Florida United State...

Post Number: 3
Registered: Apr-04
Thank You... I really appreciate the help.
 

Bronze Member
Username: Southernrebel

Louisiana USA

Post Number: 49
Registered: Mar-04
hiphop....just use the calculator on the link i posted...its really easy
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