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ETSI EN 300 422-3 specifies the technical characteristics and methods of measurement for the following types of equipment:
  • 1) Assistive Listening Devices;
  • 2) Radio Microphones;
  • 3) In-ear Monitoring Systems;
  • 4) WMAS (Wireless Multichannel Audio Systems;
  • 5) Tour Guide Systems;
with Class C receivers which have significantly reduced performance requirements with respect to sensitivity, adjacent channel selectivity, and receiver blocking compared to those with Class A receivers. It does not necessarily include all the characteristics that may be required by a user, nor does it necessarily represent the optimum performance achievable. Equipment with Class C receivers will support the operation of fewer wireless audio channels in a given amount of spectrum than Class A or Class B receivers.