Subscriber loudspeaker `` SG-1 '' (Siberia).
Subscriber loudspeakers.DomesticSubscriber loudspeaker "SG-1" (Siberia) has been produced since 1950. The subscriber loudspeaker "SG-1" (Rural loudspeaker - 1) differs from all the others in its labyrinth design. Due to this, the sensitivity of the loudspeaker is increased and a power input of 40 mW is required for normal operation, whereas a power of 150 ... 250 mW is required for conventional subscriber loudspeakers. The loudspeaker "SG-1" is designed for a voltage in a radio line of 30 V. The operating frequency range is 200 ... 5000 Hz. Uneven frequency response 20 dB. Average sound pressure 3.2 bar. Harmonic distortion 15%. Loudspeaker type 1GD-1.