Hi! This is my first post. I apologize in advance if I include anything I shouldn't. I started my home theater about a year ago with a purchase of an HTIB Onkyo s580 5.1 system for about $300 last year. I'm using the same receiver but I upgraded the speakers to Athena's point 5 mkII. I purhcased a monster reference power center and a Mirage S12 subwoofer. I received the Mirage S12 yesterday. The onkyo has powered channels for all the speakers as well as the subwoofer. I took out the passive sub that came with the Onkyo HTIB system. On the back of the Onkyo receiver, there is no subwoofer 'out' on the receiver. So I can't use the rca cable. On the back of the Mirage there are left and right connections both with both positive and negetive inputs for each. The manual stated that if I did not have a subwoofer 'out' for an rca cable, I should wire the subwoofer to the front speakers. On the back of the receiver there are 2 sections for class 2 wiring. The first small section has left and right front speakers connections. The 2nd section for class 2 wiring has all the powered channel inputs for the all the speakers that came with HTIB system. I connected the wires to the 1st class 2 wiring that only had connections for left and right front speakers. I powered up the Mirage S12 and turned up the volume and frequency but I'm not getting any response from the subwoofer. Speakers set on large, crossover set on 120. I don't know what to do other than changing the receiver which I want to do in a few months. Any ideas? Thanks in advance!