Help me modify this box

[gc86]

http://img30.imageshack.us/my.php?image=32cubes28hz435sqin9pz.png

I need to raise the tuning to 33 or so, but I need at least 30sq in of port area, how much should I take off the end of the port?

[acold7dusta]

6-7 inches?

[gc86]

Are you sure? anyone else?

[AlpineUser]

i think you have to extend the port a little bit but dunno know how long

[gc86]

I wish moe lester was around... I know someone knows how to modify this thing

[Immacomputer]

http://i12.tinypic.com/3yewzti.png

That should be pretty close to 33hz. The net volume will be about 3.35ish though but it really should not make a difference.

[gc86]

hmmm... weird I used http://www.reaudio.com/speaker_box/LPort_Box_Calc.html

and it say's the 2nd port piece should be 3 in long for a tuning freq of 33hz with 3.9cf

edit: btw this is for a RE Destroyer 15