A little help with vented subwoofer box calculations?

Question

Okay well I am just making sure I am doing this right. So I am asking for help from you guys because several brains are better than one. I have two kicker cvx 12's (4ohm, dvc) and I am trying to put them into a vented box.

Here are the specs that I figured out:

A single sub asks for =

2.25 ft^3 + port displacement

3" x 12.5" port, 20.5"

So that would be:

2.25ft^3 + .445 ft^3 = 2.695 ft^3

Then I would mupltiply by 2 because I have two subs.

2.695ft^3 x 2 = 5.390 ft^3 (5.390ft^3 being the total amount of air space I need in the box.)

The internal specs of the box I am trying to build are:

36.25" wide

18.25" deep

14.25" high

(this comes out to be 5.456 ft^3)

I believe the port would be:

6" x 25" port, 41" long

If you guys could give me some advice or let me know if this is going to work. I'll give some more info on the sub. Also, how would I tune the box or is that would all this math is for. The sub says its Resonance Frequency is 26.4 hz.

Answer 1

Dont multiply by 2 because you have 2 separate the 2 woofers and ports you need a center wall redo your box dimensions so you can add the center wall.And you need a port for each sub.If you dont separate the 2 subs they will fight each other and cancel each other out unless you reverse polarities of one speaker.Separate is best.