I'm relatively new to home theater, and I'm guessing this is probably a very stupid question...but here goes My receiver only has a 100W subwoofer, and I would love more bass during my movies. What exactly must I do to add a larger, more powerful subwoofer? I don't know much about amplifiers, which I'm guessing is the route I need to take. What and where do I connect the new sub (and amplifier?) to my current receiver?