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Since 1953 the subscriber loudspeaker "RAAZ" has been produced by the Moscow artel of the Industrial Co-operation. Subscriber dynamic loudspeaker '' RAAZ '' is designed to reproduce broadcasting programs transmitted over a wired broadcast network. Rated input voltage 30 volts. The nominal power supplied to the loudspeaker is 0.25 watt. The range of sound frequencies effectively reproduced by a loudspeaker is 200 ... 5000 hertz. The average sound pressure in the frequency band of 0.25 Pa. The volume control is made in the plug for connecting to the network. Moscow artel Promkooperatsii produced several types of AG and all with the name '' RAAZ ''.