Thanks a lot for your helpful post. I really appreciate it. I am afraid I don't know what a crossover is. I googled it, and it seems to say that some subs have a crossover control, etc. This one doesn't have ANY control on it. It just has a couple of speaker wires (red and black) coming out of it. That's it. No ports, no other cables, no controls whatsoever. And it is made of plastic.
So I guess I have two options in this case- But, say, after connecting the L and R speakers to the receiver as usual, where do I connect the two wires from the sub? To the Left, or Right, or either, or both? I mean there are 4 options, and only two wires.
Regarding the second option, since I do have zone 2 output, it is easier to understand. But I do remember an earlier post saying this puts too much stress on the receiver as the sub has low resistance? Also, of the two options, which one would be preferable given the kind of sub I have?