Basically, a passive crossover will seperate the high signals to the tweeter and mids/lows to the midrange. Normally, a crossover will have 1 input (Incoming wiring) and 2 outputs. You may also come across a crossover with 2 inputs. If that's the case it will allow you to "Bi-wire" in order to get more power to your speakers.
HTH
:D
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