Dual Sundown SA-12 Port Size?

[MrBigs63']

Alright guys I built a wedge box for my buddies single cab ford that had two Kicker CVR 12's in it and a separate chamber in the middle with two Rockford Power 6X9s. The box was sealed. I finally talked him into getting two SA-12s and take the inside chamber out so we could go ported. The enclosure is about 1 inch from the sides of the cab, so the port can't be on the side. The only place it can be is going out the top. The subs will be in a shared chamber and will have 3.4 feet of airspace all together.

So my question is, will a slot port that is 4in X 10in be enough port area for the two speakers?

Thanks,

Sawyer

[bdog]

yes but the port will have to be external and 20-22 inch long

[MrBigs63']

Why external?

[Krakin]

If it's internal it will take up a lot of volume

[MrBigs63']

I already checked the port before I got on here with the 12volt.com calculator. That is 3.4 cubes after displacement. I just needed to make sure the port area was enough.

[Jessica]

Not trying to be a dick here, but i would like to see the box dimension, Width, height, and top and bottom depth. It's really really hard to get 3.4cuft in a single cab truck even in a sealed enclosure.

not to mention the subs displacement and the port displacement. Plus the fact that you have 6x9 in the same box has raises some serious questions.

[MrBigs63']

When the 6x9s were in there the subs each had like 1.3 cubic feet each. That chamber has now been removed. There are no longer 6x9s in the box. In the shared chamber with the inner one removed the subs have about 3.4 cubic feet after all displacements. The port displaces about .46 cubic feet and the subs are .28 together.

The inside dimensions of the box are 54in wide X 19in tall. The top depth is 6in and the bottom is 8in. Those are all inside dimensions. According to the rockford calculator that is 4.16 cubic feet, so after displacements that is 3.42 cubic feet. Yes it was hard to fit. His seat is scooted way forward and he has no leg room whatsoever.

Cant tell much about size but here is a picture. The seat is scooted all the way forward. The grill on that 6x9 got bent because that is a bronco seat that used to have the little ash tray right there and it hit the speaker. That chamber in the middle is now gone.

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[Joe X]

Here is a suggestion, it meets the internal dimensions you gave and uses aero ports to save space:

Enclosure Specifications:

Fb = 35 Hz
Vb = 3.45 ft^3

External Height = 20.5 in
External Width = 55.5 in
External Depth = 9.5 in 84.4 deg.
External Depth2 = 7.5 in 84.4 deg.

Cut Sheet List:

* All Dimensions in Inches.
* Wood Thickness is 3/4 for all Parts.

External Enclosure Parts:

Front = 20 1/2 x 55 1/2

Top = 6 , 6 1/16 x 55 1/2

Bottom = 8 , 7 15/16 x 55 1/2

Back = 20 5/8 x 55 1/2 (top/botton cuts: 5.6 deg.)

Left & Right Sides =
Top = 6 1/16
Bottom = 7 15/16
Front = 19
Back = 19 1/16

Port Quantity and Dimensions:

Number of Ports = 3
Pipe Port Diameter = 4
Pipe Port Length = 21 1/4
External Length = 4

Assembly guide (generic dimensions):

Important notes:

- The ports needs 4" of free airspace in front of it for proper operation.

- Setting your amp subsonic filter to 28Hz is suggested.

[Hugh G. Rection]

Here is a suggestion, it meets the internal dimensions you gave and uses aero ports to save space:

Enclosure Specifications:

Fb = 35 Hz

Vb = 3.45 ft^3

External Height = 20.5 in

External Width = 55.5 in

External Depth = 9.5 in 84.4 deg.

External Depth2 = 7.5 in 84.4 deg.

Cut Sheet List:

* All Dimensions in Inches.

* Wood Thickness is 3/4 for all Parts.

External Enclosure Parts:

Front = 20 1/2 x 55 1/2

Top = 6 , 6 1/16 x 55 1/2

Bottom = 8 , 7 15/16 x 55 1/2

Back = 20 5/8 x 55 1/2 (top/botton cuts: 5.6 deg.)

Left & Right Sides =

Top = 6 1/16

Bottom = 7 15/16

Front = 19

Back = 19 1/16

Port Quantity and Dimensions:

Number of Ports = 3

Pipe Port Diameter = 4

Pipe Port Length = 21 1/4

External Length = 4

Assembly guide (generic dimensions):

Important notes:

- The ports needs 4" of free airspace in front of it for proper operation.

- Setting your amp subsonic filter to 28Hz is suggested.

and this is based on running how much power to the subs.?.?.?.?