Take full control of your audio with the side panel controls on the side of one of the bookshelf speakers. Three knobs are located on the side that effect the bass, treble and volume for the entire 2.1 system; Receive deep satisfaction from the rumbling lows from the S351DB when the 8-inch subwoofer is activated during playback. Movies, music, and games come to life when you have this subwoofer attached and producing sound; The S351DB is equipped with two bookshelf satellite speakers that have titanium dome tweeters that aid in producing a sound that provides clear highs in any genre of music or videos and movies Total power output: R/L (Treble) 15 W + 15 W; R/L (Mid-range and Bass) 25 W + 25 W