Golden Age Project Pre-573, 500 Series Rack Version of the PRE-73 Mk2, gain range from -15 to +80 dB, mic input impedance can be switched between 1200 and 300 Ohms, 48V Phantom power, phase reverse, select additional 5 or 10 dB gain, switchable AIR Mode, DI Input, Housing: 500 series rack Module