This system includes five surround speakers, one high-power 10" subwoofer, telescopic stands and a remote to adjust individual speaker volumes. Being able to adjust each speakers volume is important because more often than not, the surround sound can be ruined by hot spots. This capability helps the user to tune the system exactly to their specific likes. SN51 is a PLUG -N- PLAY device, which means that you can literally plug the system into any existing audio signal; DVD with 5.1 inputs, TV or receiver with out compromising any components. Each surround speaker is plugged into the 500-watt amplifier that is installed on the back of the subwoofer. This amplifier distributes the power evenly through the surround speakers and the subwoofer for a true audiophile experience.