Port length help

[BassBaller239 10+ year member]

I'm going to build a box with an enclosure volume of 2.5 and tuned to 31hz. I have a length of port tubing that is 3" in diameter and 16" long. I was thinking of cutting it in half to make two ports. I used a calculator I found off Google and it said using two ports the length would be 12" or so. Does that mean each port is 12" or could I use the port I have and cut into equal 6" pieces?

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[BlactimusCrime 10+ year member]

if you use the precision ports website, it comes out to 13.66 inches

 

[BassBaller239 10+ year member]

Is that for each port?

 

[Buck 5,000+ posts]

Hey man PM me I can help you out if you want.

 

[RAM_Designs 5,000+ posts]

Is that for each port?

Yes, that is per port. You also have to account for the port displacement so that the sub sees 2.5ft^3 after sub/port displacement. You can't just make a 2.5ft^3 box and then throw your sub and ports in there after figuring out the port length for a 2.5ft^3 box...because it isn't 2.5ft^3 after everything is all said and done, and your box volume and tuning will be way off.