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Since 1985, the Orpheus-311 subscriber loudspeaker has been produced by the Plastpribor Leningrad Association. The loudspeaker is designed to reproduce local broadcasting transmitted over the air. The range of reproducible frequencies is 160 ... 10000 Hz. The supplied voltage is 30 (15) V. The supplied power is 0.25 W. Dimensions AG - 215x48x146. Weight is 860 grams. AG was first produced according to GOST, then since 1988 according to TU. Since 1990, AG was produced under the name "Orpheus AG-311" again according to GOST.