Unless "bottom end" referred to the very lowest bass, say the 20-40Hz octave, the comment is somewhat surprising in that Axiom stated that the design purpose was to essentially duplicate the response of the M22. My M22s(with room gain taken into account), both by ear and by meter, have strong response down to 60Hz, begin to drop off about 50Hz and have much weaker but still usable response at 40Hz. This is adequate for most music, although for pipe organ and much movie LFE a good sub is certainly highly desirable.
The W22 mid-woofers, by design, are only about 7" from the wall and the bass is reinforced by this. The published Axiom measurements for the bass specs indicate that the bass of the W22s is in fact quite good for most purposes and extends to at least 50Hz.
