From everything that I read on the 950 it is a TRIPLE crossover. That means there are 3. If it was a global sub low pass and variable high pass for the sattelites, it would not be the triple crossover as described by Outlaw. They have 3 crossovers in the 950 (as I read it). One for the mains, one for the center, and one for the surrounds. This is because many owners have different speakers for each of these catagories.

Each crossover can be set individually, depending on the abilities of your speakers. For each of the 3 crossovers, the low pass side goes to the sub. So the sub handles (for instance) 100hz and below that was meant for the surround channels, 80hz and below that was slated for the center channel, and 40hz and below that would normally go to the tower mains (that is, if that is the configuration you had set the crossovers at). There is no "hole" or "doubling". The sub simply produces the frequency of each channel that the other 5 cannot produce, based on each of the 3 crossover settings.