You can run the component set off 2 channels using the included passive crossovers. You could also bi-amp the components using 4 channels (2 channels for tweets and 2 for midrange/midbass drivers). If you use just 2 channels on the fronts, you could use 1 of the remaining channels to power a sub, or probably bridge the 2 other channels into 1 to power your sub, assuming it's the right impedence load.