I've actively bi-amped my speakers and agree with Sean. In case you're curious: to actively bi-amp you'll insert an electronic crossover between the pre-amp and the power amps. One set of pre-amp outputs will feed a full spectrum signal to the crossover. Then the various outputs of the crossover will feed the various amplifiers (or channels of a multi-channel amp). The amp(s) will then be connected to the speakers.
