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Since 1964, the Subscriber loudspeaker "Signal" has been producing the Novosibirsk low-voltage equipment plant. AG `` Signal '' is standard according to GOST 5961-59. It is designed for scoring a low-frequency radio program transmitted over broadcast networks with a voltage of 30 volts. For the Moscow city network, loudspeakers were designed for 15 volts. The nominal power supplied to the AG is 0.15 watts. The range of sound frequencies is 150 ... 5000 Hz. Input impedance 6 kOhm. Dimensions of a subscriber loudspeaker 240x140x80 mm. Weight 750 gr.