Yes, Greg; an 80Hz crossover would work well for all, although setting the QS8s at 90Hz might be slightly better, at least in theory.

Setting them at 80 or 90Hz in the receiver automatically crosses the sub over at the same frequency. The low pass filter(not actually a "crossover")on the sub itself should either be bypassed(if available)or turned all the way up to get it out of the way of the crossover that the receiver is doing.

Enjoy the music, not the equipment.