Someone to Dbl chk my port lenght

[TOOLMAKER 0]

I decided to temporarily put in one of my SE12's in at 2ohms on my T3002 in mono mode. Giving it approx. 800 watts. The box is 2 cubes after all displacement. For the port I doulble up a pc of 3/4" MDF and glued a pc of 4" pvc pipe through 1 layer and router a 1/2" radius on the top layer to make a homemade aeroport. The length overall of this port is 13". I don't believe I am right in thinking the tuning is at 32. Can someone double check me on this. Also am thinking about shortening the lenght of the port to get about a 35 hz tuning. This is just a temporary daily box for me to have something till it warms up. But I listen to all kinds of music so I needed some beat in the truck.

Thanks and much appreciated for any help given.

[KU40 173]

my winISD alpha says it's a 32.5 hz tune. shorten to 10.75" to get a 35 hz tune.

[TOOLMAKER 0]

That's what I figured, but just wanted to get some more opinions, edumacated guesses.

thanks