The optional audio amplifier mounts inside the Firestorm system. The amplifier has 3 channels, (left, right and subwoofer).The amplifier delivers 15-20 watts of power depending on the power input. The line output from the computer is plugged in through the amplifier input. Speaker outputs from the amplifier make this option great for MP3 players, DJ stations, Home entertainment systems where you just plug in your speakers. It is powered by the power supply that powers the computer inside the Firestorm System. Our amplifier has built in Power noise filtering and conditioning to reduce background noise levels.