Connecting Passive and Active Speakers

[NotreDameIrish]

I have two KRK Rokit 8 speakers, and two M2 audio speakers with an Onkyo receiver. How can I connect all four to play together?

[Ajani]

Does your Onkyo have pre-outs? If so, then you can connect the actives to them and the passives to the Onkyo's speaker terminals...