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Electrodynamic loudspeaker "D-2" was produced by Moscow Electro-Lamp Plant (MELZ) from 1938 to 1941. The plant has repeatedly changed its name, so on some EDGs one can come across the abbreviation of the Moscow Machine-Building Plant, the Moscow Electrical-Lamp Machinery Plant, etc. The common thing was that the loudspeaker was produced in the household electrical appliances shop. Loudspeaker "D-2" is designed to work from the broadcasting radio network with a voltage of 30 V, as well as from radio receivers with a triode in the output stage. Power consumption 0.25 W, while it gives a satisfactory volume in a living room of medium size. The speaker is equipped with a transformer with two pairs of legs and a cord with a plug. In the case when the speaker is installed in places of collective use, where an increased volume was required, the cord had to be disconnected from the V.O. and attach to a pair of paws N.O. The maximum power for collective use is 0.8 watts. The loudspeaker was produced in several design options, in a wooden case with rounded corners. In 1940, to control the volume of the sound, they began to use a prefix controller, which was installed between the broadcast network outlet and the loudspeaker.