Speaker spec and enclosure design help

[Cru]

Hey all- I'm getting ready to build a ported enclosure for my sub and was hoping for a bit of help. I'm trying to re-use an older Petras PR124D that I've had in storage. I got lucky and found some but not all of the specs that seem to be needed (PR124D specs).

Is there any way for me to calculate recommended enclosure volume or tuning frequency from these specs or should I just base it off the frequency I'm going after?

Thanks!

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[Buck 5,000+ posts]

I could work with you on this, if you're interested.