Ok, after talking to a few people they all say the same thing. I don't have enough port. I would really love to build a 4th order but with the cold coming I've decided to wait until spring. So for the time being I would like to modify my current box for increased port area and lower tuning.
Here's the current box specs Width-37" depth-39" height-12.5
All 1"MDF with 1.5" on the top.
Ideally I could remove the back piece where the aero's are currently mounted and build a standard port. The box is currently tuned at ~34. I would like to be closer to 30.
-Build in progress-
AB VFL 500.1 @.5
(2)15" Zv1's w/ NS parts
DIYMA 1/0 3+/2- runs
4 batteries and counting...