Someone explaining the function of an Anthem pre/pro raised what I consider to be a good question.

It seems that every filter introduces a phase shift that is a function of the knee frequency (among other things). A bass management system that applies a single universal crossover frequency introduces the same phase shift into each channel, and it is relatively easy to resynch.

But in a multi-channel BM system (like my 950), each different crossover frequency introduces a difference phase shift. It seems to me that these would be a pain to re-synch before combining.

How does the 950 deal with the problem?