The new DA-3900K is the essential component for your custom high quality vocal system, in-home or out. It incorporates state-of-the-art technology, and fully digital vocal features, so your vocal amplification needs are met. Simply connect the DA-3900K to your CDG, LD, or DVD player, and a set of speakers, and you're ready to sing! VocoPro's unique twin-toriod transformer design provides the ultimate in vocal amplification by supplying power independently to each feed, positive and negative. So you get more clear and powerful sound for your vocal performances. Audition a new DA-3900K for yourself. You'll sound so good you won't ever want to put down the microphone!