But all this bantering is distracting from the purpose of my original post which is: LOOK AT MY PRETTY SUB.

If you must know, I did a sweep on the sub last night with the 4th order lowpass on the plateamp set at 40Hz and this is how it sound in room BY EAR from top to bottom:
- slowly starts to roll in at 80Hz
- pretty flat between 60-50Hz
- peaks up at 40Hz
- drop at 30Hz, but still strong
- quickly rolls down below 30Hz