Yamaha DP-U50 CAVIT External Audio Soundboard (Discontinued by Manufacturer) For use with any USB-equipped computer, computer game, or audio source (such as CD, minidisc, or cassette player) Virtual Dolby Digital and DTS (Digital Theater Systems) Virtual 5.1 reproduce multichannel sources with just 2 speakers 8 DSP modes 7-band graphic equalizer 2-year parts and labor warranty