WARNING: Stupid newbie question! I've been looking into speakers and thinking about getting one of the Canton packages, but I was a bit surprised that the subwoofers only go down to 33Hz (25Hz for the more expensive package). I've read that the normal human ear can hear as low as 16Hz. And I've just checked the documentation for my cheap computer speakers, and the subwoofer on them goes down to 25Hz (several semitones below the Canton subwoofer). How come a cheap £40 computer speaker set can do 25Hz, yet a £480 home cinema system subwoofer is only doing 33Hz? Yet the Canton system is supposed to be really good. How can this be when it doesn't produce any of the lower sounds audible by the human ear? I'm confused; please can someone explain?