The Logitech name usually brings up ideas of web cams, joysticks, wireless keyboards and handy-dandy mice. Not until they really got serious about their speaker making did their name start ringing in with major bass. The Z-560 was a 400 watt, 4.1 system that was also THX certified. At half the cost comes in it's little brother, Z-640. At 51 watts, the 5.1 system is not THX certified but still has all the power and performance that a home user will need.