This Studer card (Part Number: A949.0427) offers four analog microphone or line inputs, a great addition for your D21m system.

Using this Studer microphone/line input card is easy. First, make sure your D21m modular I/O system is turned off. Then, carefully insert the card into the appropriate slot. After that, you can connect your microphones or line - level devices to the four available inputs. When you're done, turn on the system. For maintenance, keep the card in a clean and dry environment. Avoid exposing it to extreme temperatures or humidity. Also, don't touch the connectors with dirty hands as it may cause connection issues. If you notice any problems, consult the Studer customer service.