Denon AVD-2000 Pre-amp / Surround Processor for digital sources. Versatile unit, can serve as a Stereo or Surround Pre-Amp with Dolby Digital and DSP processing. Excellent sound, equipped with Burr-Brown DAC's. Digital Inputs include 2 x Optical, 2 x Coaxial. Analog 6-Ch input and output, Analog and Digital stereo record outputs.