Sigma features the following connectors:
On the rear panel:
4 DB25 connectors for the 16 stereo inputs.
4 DB25 connectors for the 16 stereo outputs.
One DB25 connector for Mix B, headphones and insert sends.
One DB25 connector for external input, insert returns and talkback.
One jack input for foot switch control.
Two pairs of XLR outputs for main and alternative monitors.
One pair of XLR outputs for MIX A Left and Right.
One RJ45 port (for communication with the Remote software).
One USB port (for factory use only).
One DC connector for the external PSU.
On the front panel:
One ¼" jack Headphones output.
One 6.35 mm iJack input.