The general advice is always to improve on the preamp but I have read the active systems absolutely blow any passive system away. Also how do I run the speakers can I purchase a normal speaker and have it modified for active use?
You need to be able to either bypass or remove the crossover: easy if the speaker is designed for so doing (e.g. many ATCs and PMCs), but varying degrees of more difficult otherwise. You also need either to have crossover details to be set in the active crossover, easy if speakers for which standard setups are already available, e.g snaxos already set up, and not difficult if full crossover info us available including crossover frequencies and slope, otherwise varying degrees of more difficult...