Sean Box Help


Bronze Member
Username: Algirard1

OH United States

Post Number: 76
Registered: Dec-04
I will be getting a Atlas 15" for my ford ranger extended cab. I have a box designed but I don't know how to build the port. I want to tune the box to 28Hz. Can you help me with the port? A link to the box is below.

Silver Member
Username: Byrumjr

Post Number: 203
Registered: Jan-05
First I don't know the displacement for your sub. The displacement for the port will be so small I don't even worry about that.

From your photo I got 3.61 cu ft if you made it out of 3/4 wood.
For the port you can take round PCV pipe and put in the box.
To get 28 Hz you can use
one 4 inch pipe and have it 9 inches long
one 3 inch pipe and have it 4 and 1/2 inches long.
I tune my boxe at 36 hz

Gold Member
Username: Insearchofbass

Post Number: 1362
Registered: Jun-04
ok if your cubic feet of box is 3.61 internal after displacements for sub and port then you want two 4 inch inner diameter ports 21 inches deep a piece for a 28 hz tune even if that box size was before the sub and port youd still be tuned around 29 hz port volocity is accounted for even up to 1200 rms( im not sure of that subs power handling)

Gold Member
Username: Insearchofbass

Post Number: 1363
Registered: Jun-04
dont do a single 4 inch port you will have alot of port noise
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