Volume Measurements With Multiple Subs

[Edward_Stryfe]

I am trying to figure out what I would need for a ported box that holds two 10's the resonant frequency is supposed to be 38hz/36hz the manual comes with dimensions for a single ported enclosure as well as the length of the port. But since I'll be using two of those subs in one box I'm wondering if I simply need to double the volume and add a second port to it in order to accommodate the second sub.

(Dimensions of the Single Sub Enclosure(From the Manual))

Width: 18"

Height: 13"

Depth: 10"

Port Diameter: 3.5"

Port Length: 10"

Port Frequency: 38hz

Box Volume: 0.9 Cube(s)

(Dimensions for Dual Sub Enclosure(What I Am Guessing Should Be Right))

Width: 30"

Height: 15"

Depth: 11"

Port1 Diameter: 3.5"

Port1 Length: 10"

Port2 Diameter: 3.5"

Port2 Length: 10"

Port Frequency: ???

Box Volume: 2.1 Cube(s)

The specs show that the sub's resonant frequency is 36hz which is I'm guessing what I should try tuning the port to. It's also recommended to have 1cube of volume in a ported box. What I want to know is if for volume I simply needed to add 1+1 and whether or not what I'm doing with the ports is correct.

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