Since this is in the English-language section for some reason or other, I'll answer likewise. Non-coincident drivers exhibit reinforcement/cancellation patterns within the frequency band in which they work in tandem. Since their displacement in space is translated into an equivalent displacement in time for all points other than those equidistant to their acoustic centers, a lobing pattern is created:

The axis in the middle of this lobing pattern can be tilted, either by physically displacing the drivers, or by manipulating phase discrepancies arising from the properties of the preceding electrical filters (i.e. the crossover), or both. In actuality the inherent axis of a conventionally mounted driver pair will tilt towards the driver which is mounted further back than the other. Therefore, if a cone woofer is mounted above a dome tweeter, their axis will tilt upwards at the crossover frequency, all other factors remaining equal.