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>>Do I understand it correctly that if it crosses at say, 150Hz, and the Axiom QS4's response goes down to 100Hz, that there would be a hole between those frequencies?

It's actually not that bad. If the QS4 goes down to 100 and your receiver crosses over at 150 there would be no problem since the QS4 would be able to handle anything the receiver sent to it. Higher crossover frequencies work with any speakers (even tiny HTIB systems) while lower crossover frequencies require larger and more expensive speakers (like the Axioms).

The only problems related to a too-high crossover frequency are (a) many people can "localize" the subwoofer with a crossover frequency >80 Hz (ie can distinguish that there is a separate subwoofer rather than having all the sound seem to come from the main/center/surround speakers) and (b) the sub won't do quite as good a job with the 100-150 hz range as the Axioms would.

Localizing the sub is not a big deal if you put the sub in the center near or behind the TV. Having the sub cover the 100-150 Hz range is a tiny argument in favor of getting a sub with a smaller driver although most subs seem to do an OK job up to 150 Hz anyways.

The fixed crossover frequency should not be a problem.