Creative Labs MegaWorks 550 5.1 THX Computer Speakers (6-Speaker, Black) Enhanced design over our award-winning MegaWorks 510D, with THX quality performance in movies, games, and music High precision rare-earth magnet driver enables a compact speaker design for optimum audio fidelity Palm-sized wired remote with master volume, power, treble, bass, and mute controls; headphones jack; and individual control of center and rear speakers The widest sweet spot provides an engulfing 5.1 surround sound experience with any Sound Blaster 5.1 sound card