JBL DUET-200BLKV High Performance Stereo Loudspeaker System for Multimedia Devices (Black) Complete Stereo sound system in a single enclsoure Easy to use touch volume control. Slipstream port design delivers distortion free bass output. COE(Computer-Optimized Equalization) provides a rich soundstgae from different listening areas. Digital amplification and DSP(digital sound processing) gives you great sound.