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Kristall subscriber loudspeaker has been produced since 1965. The manufacturer is not installed. The subscriber loudspeaker "Crystal" has two loudspeakers, which is how it differs from the rest of the mass of serial subscriber loudspeakers. And even higher power input, respectively, and higher volume. Dimensions and weight are also correspondingly larger than that of simple AG. The rest is all the same. AG is designed for the operating voltage in the broadcasting network of 30 V. The input power of 0.25 watts. The price of the loudspeaker is 7 rubles.