Passive biamping (where you split the output of the pre-amp and connect those two lines directly to the amps) is generally considered to only provide additional power - something along the lines of getting two 100W amps to drive a speaker that would otherwise warrant a 200W amp. Active biamping (where the output of the pre-amp is routed through a crossover circuit designed to match the speaker and the speaker's internal crossovers are removed from the signal path) is said to offer some additional benefits, but the knowledge required to properly implement an active biamping system is significant - something along the lines of "if you have to ask how to do it, you might not want to go trying it." With Klipsch speakers, you probably would not need to biamp.