Outputs are always in phase.
The XM1 electronic crossover network module is a fourth order constant voltage crossover design. The crossover network is implemented as a fourth order state variable filter. One crossover network is needed for each channel of a bi-amplified system. A quad system needs 3, and so on. The filter can also be used to drive a subwoofer, where the subwoofer is shared by the two channels of the stereo system.