Hello! I have an old style Yamaha stereo receiver, and a passive subwoofer. The sub is a relatively simple one judging from various posts i've read. It has 2 connectors (a + and a -. that's it that's all) and an impedance of 4 ohms. I want to connect it to my yamaha system. the yamaha has the typical A / B systems of that era... to which i have my left and right 8 ohm bookshelf speakers on system A. What i'd like to know is what is the best way to connect my sub to the receiver? Can i connect it in parralel to something without damaging the system? can i put it on system B? can i connect both left and right of system B to the sub? Finally, the specs of the system says: A or B 4 ohm max (per speaker i'm guessing) A & B 8 ohm max (each, per speaker). Hopefully someone out there has enough info from this post to help me out? THANKS A LOT EVERYONE!!