Basically what Big said, Active would mean a seperate channel between your woofers and your tweeters without using the inline crossovers. The down side is you need some way to high-pass crossover during pre-amp from 2000-3000hz for your tweets; so do your reasearch on HU or Amplifier crossover controls.
When its all said and done bi-amp sounds very good and gets rid of the usually junk component crossovers.
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