need help with a box

[slaggster]

I have 2 IDSPL15's and have had them in a sealed box now I would like to build a ported box but am unsure how to tune it. Image Dynamics told me 3.0 cuft tuned at 32htz each. I have an Escalade that these will be going in. I would also like to build 2 seperate boxes in case i have to take them out. So I can figure out 3 cuft but am unsure how to tune to 32htz. Should I use square or round ports?

Total width of boxes has to be under 49" 24.5" wide each box.

hope someone can help

Thanks

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