Is the tuning of box Fb?

[innsanes 10+ year member]

im using a program to design my ported box and i was wondering , when they say there box is tuned to like 28hz is that the Fb or the F3?

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[j3bus2k3 5,000+ posts]

Fb=Tuning

F3=iirc, the point where the response curve crosses the -3dB reference line.