Help with ported box dimensions

[inm]

When designing a box, how do I figure port?

Like, if a sub needs 1 cu ft of airspace, do I make a box with 1 cu ft PLUS the port space, or should the port space be included in the final dimensions?

Let's say the sub needs 1 cu ft, and I have a .25 cu ft port (just throwing out numbers for example purposes)

Would I need a 1 cu ft box, or a 1.25 cu ft box?

I hope you guys can figure out what I'm asking. If not, just let me know, I'll try to ask it a different way.

[Guest]

1.25

[CaptainzPlanetz]

What he said^^^^^^^^^^^^^^^^^^^

I would just use Torres Calculator, it does all the extra calculations for you, and it shows you if you are within the correct port area.

[inm]

thanks guys

[inm]

I used the calculator, but the port seems really really small...

Here's the info from the calculator:

~~~~BOX DESIGN~~~~

-------BOX------

Box Height: 15''

Box Width: 34''

Box Depth: 20''

-------PORT------

Port Height: 2.5''

Port Width: 10''

Port Length: 6''

Physical Port Length: 5.25''

Number of Baffles: 1

Baffle Thickness: .75''

Baffle Displacement: 0.26 ft³

Sub Displacement: .36 ft³

Bracing Displacement: ft³

Gross Volume: 4.70 ft³

Port Volume: 0.16 ft³

Port Area Per Cubic Foot: 6.38 in²

Port Area: 25.00 in²

Net Volume: 3.92 ft³

Tuning Frequency: 38.87 Hz

~~~~CUT SHEET~~~~

------BOX------

Top: 34'' x 20''

Bottom: 34'' x 20''

Sides (x2): 13.5'' x 18.5''

Front/Back: 34'' x 13.5''

------PORT------

Port Top/Bottom: 11.5'' x 5.25''

Port Side(s): 2.5'' x 5.25''

And here's the Sketchup I made, which is what makes me thing the port is too small.

(Note, I added a .75" baffle to Sketchup. True outer box height is 15.75")

Also, left off the back piece so I could see in.

Anyway, does that port seem right?

[imfrom210texas]

have you used any other calculators?

[inm]

Nope.

[inm]

So, any input?

The port seems really small to me.

Does that seem accurate?