View Full Version : Check Numbers please?

08-24-2009, 11:36 PM
Ok, making box for two 12" Rockford Fosgate P3's. Came up with the following:

Length: 39.5
Height: 15
Depth: 18

Comes out to 4.9 Cubic Feet? But that is without subtracting volume for ports and subs i think. Someone help me? tell me total cubes? Did i build it correct?

With two 4" PVC pipe and I'm thinking 10" deep? have not put in pipes yet so i am asking you. What should i tune it to? and how do i tune? I am new at this, first box ever..

08-24-2009, 11:37 PM
32-35hz ish is what i would tune it to...

08-25-2009, 12:05 AM
How do you tune?...Call me a moron but never have did it...

08-25-2009, 12:33 AM
port diameter and length + cu^ft = tune

accroding to your specs you have: (Assuming your using 3/4 mdf) Total 4.89cu^ft

If you did 2 ports at 4" round by 10" length you should be at about 33hz. VB is then 4.5cu^ft

bass box is showing to much vent air velocity with just two 4" ports. I'd suggest one 8" port 24" long. Makes your box 34hz

08-25-2009, 12:51 AM
wait wait, 8" at 24" long?...you mean rectangle port? and uh, too much air? so like...tell me what i need to do, if i build it way i am atm will it be ok?

08-25-2009, 09:43 AM
Finishing box today guys...can anyone tell me if i build it way i said if it will sound good?....shoulod i change length of ports? if so what to? What will that tune it to? I AM SO CONFUSED! HELP ME

08-25-2009, 12:07 PM
Help Me Please