Mark, I hate having to be the one to point this out, but the dimensions of your trap #2 look to be almost exactly 2:1:1, not unlike a cube in terms of bass response
Only when empty...only when empty. And 9 times out of 10, it's usually two-thirds stuffed with Bassi.
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::