For subwoofer specs I see things like woofer size, watts, frequency response and crossover frequency. Can you explain to me how these impact how powerful a subwoofer feels? Is watts the biggest factor in power? I know it depends a lot on manufacturer, design and the room it's put in, but I'd just like a general idea. Also, how does the wattage of the subwoofer relate to the wattage of your receiver? Can you have a 200 watt sub and a 100 watt output per channel on your receiver? Thanks.