Opinions on this 4th order for 4 sundown zv3 15"s.

[Pro7]

Because there is only a height of 37 inches total , so 18.5+18.5 = 37 plus 3" for wood top and bottom =40" height which I don't have.

..... you dont understand What im saying at all..

And why is 4 15s in a 4th guaranteed to be louder than 4 18s in a ported wall that would work..