Amp and box for Skar DDX-12?

[Brandon141]

Ok, so currently I have a ddx 12”, skar 800 mono amp with a skar prefab ported box that’s around  2.0 sq.  It’s in a 55 ford so the trunk is pretty big. 
  To me it just doesn’t seem like it’s performing at it best! Can someone please give me amp and custom box dimensions / recommendations. 
thank you. 

[Joe X]

Open up the rear deck to let sound waves into the cabin. That is going to be half of the fix.

 

Would need all the details of the box design you have (all internal and external measurements)  to tell you if the box is a problem but 2 cubic feet net is pretty standard  and should work, the amp is a little weak but nothing that would make a great difference.

 

If opening up your rear deck is not enough I would go two 12s, probably better ones if possible.