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The subscriber loudspeaker "GDT" has been produced by the Riga plant "Radio Engineering" since the beginning of 1949. Subscriber loudspeaker "GDT" is characterized by increased sensitivity and, accordingly, increased sound pressure. The rated voltage in the line is 30 (or 15) V. The rated input power is 100 mW. The range of working sound frequencies 150 ... 6000 Hz. Irregularity of the frequency response - 12%. Averaged sound pressure of 5.6 bar. The harmonic coefficient is 10%. Dimensions of subscriber receiver 250h250h112 mm. Weight 1 kg.