building enclosure for 15" woofer

[dbsupra 69]

I have a pair of brand new cerwin vega vs-150 woofers from the mid 90's. They are in mint shape.

I need to build an enclosure for them but not sure what would work best. I found the original specs of the enclosure and calculated it to 5.1 cuft gross. They use a dual port design but obviously no idea of tuning.

What would be a range I need to work with for port tuning and port area? I can estimate displacement but that's about all I have to go on.

Not too familiar with building anything for an actual woofer.

Thanks!

Here is a pic for reference