The Nanoamp Series SUM100-RCA Stereo to Mono Summing Amplifier from ATI Audio Inc. provides simple means to sum a stereo signal down to mono. The amplifier features both XLR and RCA connections to allow both balanced and unbalanced input devices. In addition, it can be used as an impedance converter and summing for RCA signals.
The SUM100-RCA is built with front-panel screwdriver-adjust gain controls that provide 26 dB of gain at full clockwise rotation, and unity gain at twelve o'clock with a smooth taper to full off. The output driver is a servo controlled, ground-sensing circuit, which will supply over +24 dBm to 600 Ohms balanced loads and +20 dBu to high-impedance, unbalanced loads.
Additionally, loop-through DC connectors allow several Nanoamps to share a single external 24 VDC power supply (included). Up to three amplifiers can be mounted side-by-side in a 19" optional 1-RU kit.