DIGITAL MIXER RACK MOUNTABLE 8 MONO/6 STEREO INS 6 OUTS 4 BUS DSP/ARC/FBS 4RU The M-864D is a 4U rack mountable Digital stereo mixer having 8 monaural Mic/Line input channels and 7 stereo input channels, 6 output channels including 4 bus assignable monaural output channels and 1 stereo recording output channel. It is equipped with digital signal processing functions such as Automatic Resonance Control function (ARC(*1)), Feedback Suppressor function (FBS), Automatic stereo input mute function (AUTO MUTE or Ducker), and Equalizer.