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Exactly. If the speaker's -3dB point is 60 hz, for example, you probably wouldn't want to set your receiver crossover to 60 if you wanted the best response from the speakers because the receiver is expecting the speakers to stay "flat" for at least 1/2 octave or so below the crossover point..

On the other hand, a lot of people on the board do set their crossover frequencies at or even a bit lower than the speaker's -3dB point to avoid localizing the sub. This is an issue because for many people the best sounding spot for the subwoofer is NOT right by the TV, so they either have to choose between having the sub in a bad spot (weak / crappy / boomy bass) or setting the receiver crossover lower than would be ideal for the speakers.

A good example of this would be the VP100 -- its -3db point is 95 Hz, but a lot of people run it with an 80 Hz crossover because that gives them the best overall sound. They are generally getting better bass effects (ability to place the sub where they want for better sound) at the cost of a (largely inaudible) dip between 80 and 100 Hz.

Again, I wouldn't sweat the higher crossover frequency on your receiver unless you determine that the only place in the room where the sub sounds good is way off to one side or behind you. The Axioms will be putting out sound down to 100 Hz and below, just relatively less below the crossover point (and the sub will be picking up the slack).

Speaking of subs, does your receiver have a "subwoofer out" RCA jack ?