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Subscriber loudspeaker "Beam" since allegedly since 1967 produced several plants of the country (see logos). "Beam" is a standard subscriber loudspeaker, the number of names of which by the end of the 60s of the 20th century was in the tens. The input voltage is 30 volts. Type 0,15GD-III. Power consumption 0.15 watts. The range of reproducible sound frequencies 200 ... 4000 Hz. The average sound pressure is 0.2 H / m2. Input impedance is 6 kΩ. Dimensions 200x100x65 mm. Weight 750 g. Photos of subscriber loudspeakers from online auctions and sales sites.