Placing a board to cover the opening (at a 45 degree angle)
about 1/3 to 1/2 just seemed to suppress the SPL and alter the
freq slightly. Appears that I choked the bass output - haha
*BUT* it was still louder and more punchy than just having
the box sit there in open space.

Hornloading does rule, too bad I don't have the room to make
what I really want to make. There is no magic bullet.

For now, I will stick with my traditional design, perhaps someday
make a horn loaded system. hahaha

I do like the chest pounding midbass from concerts.