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The crossover is passive.

For them to be active, it would be necessary to use 2 stereo amps inside the main speaker. One for the tweeters and one for the woofers, plus two sets of speaker cables to the passive speaker to supply each driver with its own, filtered signal.  Needless to say, that would add cost and complication.  Alternatively, each speaker should be active and have its own stereo amp and power supply. Not to mention the active filter circuitry, which is not simple.