The ADCS III provides professional quality 24-bit A/D conversion, along with AES path insertion and interruption functions. The ADCS III may be configured as a standalone A/D converter or to switch AES or stereo analog inputs into another AES stream. The ADCS III is a perfect companion for analog EAS encoders/decoders to be inserted into an AES program stream. The ADCS III is equipped with relay bypass in case power is removed from the unit. The A/D converter may be configured for sample rates of 44.1 or 48kHz (32kHz may be special ordered) or an external word clock from 32 to 96kHz. Additional features include; balanced stereo analog input, AES input, AES output and remote control via plug-in euroblock connectors. The front panel is equipped with left and right analog input trimmers, overload, audio presence and power LED indicators. Input transfer switches are provided along with LED indicators. Most front panel functions and status are available on the rear panel connector. The ADCS III is powered by a surge protected internal bi-polar 15 vdc power supply affording superior headroom and high definition audio. The ADCS III may be set on a desktop, mounted on a wall or up to three units may be mounted on the optional RA-1, Rack-Able mounting shelf.