Specifically engineered for the GLK-Class, this premium digital sound system fills the cabin with 510 watts of beautifully balanced audio. No fewer than 11 strategically placed speakers plus the rich bass of a subwoofer deliver a wholly immersive listening experience. Digital Dynamic Volume Control impeccably and imperceptibly maintains the sound spectrum for consistent listening pleasure in varying driving conditions. And on models also equipped with the Multimedia Package, Dolby Digital 5.1 surround sound technology adds to the experience.