Most computers today come with separate right and left speakers, sometimes accompanied by a subwoofer for better bass. All speaker systems are driven by a sound card or chipset installed inside the system unit.
NOTE
Surround Sound
So-called 5.1 surround sound speaker systems come with five satellite speakers (three front and two rear) and the ".1" subwoofer great for listening to movie soundtracks or playing explosive-laden videogames.