Heritage Audio MCM8 Summing Rack, 8-Slot Rack Frame for 500er Modules with build-in 10-Channel Summing Mixer, Mix Bus with vintage Neve-style passive voltage summing, analog VU meters, Master Volume Switch, 140mA total available Phantom power, stereo input daisy chained additional MCM-8s, XLRs and SUB-D25 I/Os, Dimension: 19" 4U