Need Help with WinISD Calculation not correct

[Chadrbns]

so i was following a youtube tutorial on how to build a box on WinISD and i followed everything to the T except for this with my vent length

the vent length number is extremely big. what am i missing? can anyone help me out or know what i am talking about?

thanks in advance!

*EDIT* Found my problem!

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[T3mpest 10+ year member]

Your tuned to .0011hz? First resonance is higher than the tuning frequency by quite a bit usually, a it was less than 1hz loll