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Now basically what an active crossover gives you the ability to do is choose the crossover points and slopes for your speakers rather than a predetermined crossover slope and points determined by a passive crossover. This is a huge advantage because we all know that each car has different characteristics that can alter a speaker’s response. An active crossover can be used to make up for these discrepancies in a car.
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This is quoted from another forum. This is basically the benefits.
As for going active on the deck, you adjust the slope and frequency settings on the channels of the deck to where you want them, check in the manual for how to do it properly.