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The subscriber loudspeaker "GDT-1" was produced by the Riga Radio Engineering Plant since 1949. AH is characterized by increased sensitivity and increased sound pressure. The rated voltage in the line is 30 (or 15) V. Power input is 100 mW. Frequency range 150 ... 6000 Hz. Frequency response unevenness - 12%. The average sound pressure is 5.6 bar. Harmonic coefficient - 10%. Dimensions AH - 250x250x112 mm. Weight - 1 kg.