Crossover settings
As previously sugeested, start with a crossover of 80 Hz for all speakers on the receiver. Trun the crossover knob on the sub to the maximum (150 Hz) so that it wont interfere with the receiver settings.
Based on the specs, it looks like your main L/R floorstanding speakers are close to full range so you could expeiment with a lower crossover setting (60 Hz, etc.) for those channels after you have everything else setup and working properly.