Actually I do have an active crossover for the woofers, but only to adjust the input sensitivity (since the M200's don't have an adjustment built in, which would be very nice. Hint, Hint Outlaw). It was the only way I could get the five amps balanced. The midranges and tweeters have their own built in passive crossover network so they do not use an active network. BTW the active crossover was the 120V device that I needed to be powered by a switched outlet on the 990, but instead had to wire it through the other side of the relay.