It depends if your speakers are built to bi-amp (separate binding posts for the woofer and tweeter). If not, then you will have to do some serious modifications to the speaker and crossover. Also, it is better if your pre-amp has more then one set of output jacks.
Here is a link to a diagram that might help.
http://www.puristaudiodesign.com/vert-biwire.htm
Here is a link to a diagram that might help.
http://www.puristaudiodesign.com/vert-biwire.htm