Tigg,
Feel free to stop by (SoCal) and check the RTA in-room readout of a 20hz to 200hz sweep. You'll note that the system is flat to 25hz on axis at the listening chair. Could go lower, but no need for music. You'll also see that the system is +/- 2db below 125 hz - pretty much impossible IME without subs and/or DRC.
Marty
PS If you take a listen to the program material of your choice, you may not hear much below the 43hz you get on your system (very little music goes there) but you will hear the lack of the typical suckout at 80 hz (usually north of 10db) and the missing hump in the 1/2 octave above that (usually north of 10db,as well).
No offense taken at your post - just pointing out that the suggestion of upgraded speakers doesn't eliminate 1/4 wave cancellation, unless the speakers are in-wall, on wall, flush to the wall, and/or digitally corrected.