Digidesign DIGI 003 Rack Factory - FireWire audio interface, 2U rackmountable, 18 simultaneous channels of audio I/O, 24-bit/96 kHz resolution, 8 analog inputs, 8 analog outputs, 4 professional mic preamp with 48V phantom power (switchable by channel pairs), 8-channel ADAT optical I/O or 2-channel of S/PDIF optical I/O, 2-channel S/PDIF digital I/O, 1 MIDI in, 2 MIDI outs, BNC Word Clock I/O, dedicated studio monitor output, alternate control room output, alternate source input for external device monitoring, dual headphone outputs.