The 510 uses a "Subwoofer Mode" instead of small/large, but it is the same.

The "Subwoofer Mode" on page 26 shows the functions available. Picking mode 1 sends low frequencies from all speakers to the sub. Mode 2 - center and surround.

Crossover defaults to 80 Hz, which is what most of us use anyway. It is a global setting for all speakers.