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The Nocturne-317 subscriber loudspeaker has been producing the Leningrad Plastpribor Association since 1989. '' Nocturne-317 '' is intended to reproduce the programs of the low-frequency channel of a wire broadcasting network. AG is made of high impact polystyrene. The side walls of the case are wooden, polished. In AG, a dynamic head 0.5GD-42M with a diameter of 125 mm is used. The transformer type TAG-P1. Resistor SPZ-ZOA-0.5-33 kOhm is used to adjust the volume, its handle is displayed on the front panel. The rated input voltage is 30 V (15). The effective operating frequency range is 160 ... 10000 Hz. The average sound pressure at nominal voltage in the frequency range 315 ... 4000 Hz is 0.25 Pa. Dimensions of the device 254x69x150 mm. Weight 0.9 kg. 35 dB volume control range.