This Studer card, with part number A949.0427, offers four analog microphone/line inputs. It's a great addition to your D21m system.

To use this Studer mic/line in card, first make sure your D21m Modular I/O System is powered off. Then carefully insert the card into the appropriate slot. After that, you can connect your microphones or line - level devices to the four analog inputs. When using, avoid exposing the card to extreme temperatures or humidity. For maintenance, keep the card clean and dust - free. You can use a soft, dry cloth to gently wipe it every few months. If you encounter any issues, power off the system immediately and consult the Studer support team.