i need help with measurements for a enclosure build for two fi bl 12 tuned to 32 hz. i can build this enclosure up to 4ft wide 18in deep 18in tall im looking for this to be a 5 cb ft volume... thanks for your help

i need all measurements and slot port width lenght measurements... again thanks...

You know a good person to talk to is Bromo. That is his username on the forum. He does "Eclectic Enclosure Designs". He gives a whole spreadsheet of the design, volume, tuning, displacements, dowel bracing (if added), and cut sheet. Really helpful if you're planning to build your own box.

Try this to start and then figure it out by hand. That is the best way to learn imo!