Help with box design for 2 Skar ZVX 12s

[jmanjr82]

First up is a box for a Pair of Skar ZVX 12s D1 1500rms that will be powered by a Skar Sk4500.1@1ohm (Vehicle Honda SMX)

The usable dimensions are as follows:

H- 20 inches

W- 33 inches (this is right between the wheel well plastic pieces)

D- 20 inches (this is right to the rear cargo door lock)

Enclosure Specs:

Ported : 2.0-2.5 Ft^3 @ 34 Hz

Displacement : 0.15 Ft^3

Mounting Depth : 8.5"

Outside Diameter : 12.8"

Cut-Out : 10.9"

Magnet Diameter : 8.3"

T/S Parameters:

Re : 2.19 / 3.6 Ohms

Fs : 52.5 / 51.8 Hz

Mms : 380.419 / 362.871 g

Rms : 14.4 / 14.3 Kg/s

Cms : 0.024 / 0.024 mm/N

Bl : 19.5 / 19.4 n/a

Qts : 0.67 / 0.68

Qes : 0.72 / 0.74

Qms : 8.69 / 8.68

Vas : 6.66 / 6.68 L

Spl : 83.3 / 83.7 dB

For the box I would like either subs up port back or subs back port back. Music played ranges from rock/metal to some Decaf. Wood used will be 3/4 Birch. If needed I can use aero port/s or rectangle/slot port whatever works. Lastly I would like the port centered between the subs if its a slot port obviously. Thanks in advance for any and all help. If there is anymore information needed feel free to ask.

[Joe X]

Using all the 20x33x20 you get the 4 cubes net @ 34Hz, problem is you can't really do port back unless (maybe) you were willing to go higher than 20" your current dimensions would work subs /port up.

EDIT: this is because there would be no clearance for the port firing backwards.

[jmanjr82]

http://www.rockfordfosgate.com/Support/rftech.aspx#boxwizard

On the fosgate site I got 6.24 cubic ft

So if need be I could do H:25 W:33 D:16 which by fosgate would be 6.21 cubic ft would that work? I think if possible subs up port back would be most ideal. I can go fairly high like say 26. I just wanted to ensure the box would be semi symmetrical

[Cj Kumz]

Yah that's 6.21 cubic ft before sub or port displacement so it could work. Or you could do H:23 W:33 and D:16, and get two 6'' flared ports and fire them backwards. Make them 25 inches long to get 34 Hz. Or you could do the slot as Joe X suggested.

[jmanjr82]

If the ports have to be that long are you talking bend them inside the box, because I dont see how they could be inside and outside the box and still fit in that area. I think it could work though.

[Cj Kumz]

If the ports have to be that long are you talking bend them inside the box, because I dont see how they could be inside and outside the box and still fit in that area. I think it could work though.

Yes you can buy elbow bends. Make sure they are curved not sharp 90 degree bends.

[jmanjr82]

I am a plumber in the USAF so that is my language lol. Looks to be a long sweep 90 thank you