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Subscriber loudspeaker "Don" (0.25 DG-III-3) allegedly since 1952 produced artel "Univertrud" (city of Voronezh). It was the predecessor of the Voronezh subscriber loudspeaker, which since 1953 has been manufactured on the identical element base. Loudspeaker Don is designed to receive one radio program of a local wired radio broadcasting network with a voltage of 30 V. The loudspeaker case was made of plywood, painted in red-brown and measured in dimensions of 230x160x88 mm.