From the ATI-Audio NANOAMP Series, the SUM100 is a stereo to mono summing amplifier with balanced XLR 3-pin input and output connectors. In many cases, amplifiers, preamplifiers and analog mixers are able to provide stereo output but are incapable of summing stereo signals to mono. Mono signal feeds are required for certain wireless transmission as well as other applications relative to sound reinforcement and recording.
The inputs provide a balanced 40K ohm bridging impedance for line levels up to +24dBm. The high input impedance allows the input to also bridge -10dBu (hi-fi, RCA plug) lines without loading. Font panel, screwdriver potentiometers provide independent input trim controls and full range master gain control. 28dB gain maximum with input and output controls fully clockwise.