8in DVC RAdioSahck Sub need help with box

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RadioShack 1348A DVC

Id like to use this sub for my little desktop PC soundsystem. Im using a pair of Maudio Studio Pro4 monitors and would like to add a sub to extend the bass a bit the M-audios only go down to about 80hz. Id like to use som 12in diameter industrial cardboard tubing for the box. I plugged the numbers into Bass Box pro and it suggest the following
12in x 11.9in sealed stuffed box
f3= 64.5hz

Now 64.5 seems a bit high for a sub, am I doing this correctly, this is my first diy sub project.
thanks
frank
 
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