I know that my current box for my OA15 is a tad small in total box size and port size.

But yet the sub still pounds!

Hits the lows nicely!

So I'm wondering what my box is actually at

Dimensions:

31x16x15

Port is 14 1/2 tall by 1 inch wide

And if I went to an appropriately tuned and sized box, how much of a difference would it make in terms of SQL?

Don't know if this helps, but I am running on a Audiopipe ASPM-1500 wired at 2 ohms gain set around 50%

With that, after box rise, all the technical stuff, how many watts do you think the sub is actually getting from my amp?