I hope to set-up my new surround sound receiver today. I have an old passive 12 inch sub woofer that I was planning on using until my budget permits picking up a new powered sub-woofer. In reading the instructions with my new receiver, I note that it has a specific connection , actually a cable with connector for a powered sub-woofer. I assume that I cannot connect my passive sub-woofer there. I have not used my sub-woofer for a couple of years and have forgotten how it hooks up. I'll look at it later but I seem to recall that the connections actually went in series to the Left and Right front speakers, does that sound correct?