it's just easier to get a handle on digital bass management if you use the term 'filters' instead of a crossover.

actually it's an infinite impulse response (IIR)filter that sets the slope and corner frequencies for the high and low pass filters. the 5 full range signals are high passed and then sent to the respective satellites (where they are then passed through a passive 2 way or 3 way crossover in most cases). that full range signal is not passed through a crossover network.

5 duplicate full range signals are summed and level adjusted to create a composite signal. this composite signal is then low pass filtered and then summed with the LFE signal, which has also been level adjusted and low pass filtered. this creates a single digital bass signal which is now called subwoofer.

if that's a 'crossover', then i don't know what kind it is. i prefer to call it a virtual routing scheme of volume knobs, y jacks and filters. it's main selling point is that it's smaller than analog circuits. i suspect that's because the only other points are negative ones.