The D 500 DUO is a 500 Series receiving frame with balanced analog inserts jacks. When two preamp modules are loaded in the rack, the inserts can be used to connect processors like compressors and equalizers. The insert return signal comes before the output jack. If no processors are inserted, the insert send can be used as a secondary output for the module. The S/PDIF output derives its signal post-insert. This allows for a processed mic pre signal to be converted to digital and sent to a DAW or digital recorder. Analog and digital outputs are always active. The S/PDIF I/O also allows digital signals from a DAW to be sent to the rack, converted to analog, processed by whatever modules are present, converted back to digital and have the signal returned to the DAW.
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