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The subscriber loudspeaker "Crystal" was released allegedly since 1961. The manufacturer is not installed. The subscriber loudspeaker "Crystal" has two loudspeakers, and this is different from the others. And more increased power input and higher volume. Dimensions and weight are also greater than those of simple hypertension. The rest is all the same. AG is designed for operating voltage in a 30 volt broadcasting network. The power input 0.25 watts. The price of the loudspeaker is 7 rubles. Since 1965, produced a similar loudspeaker "Crystal", but with round speakers and with a cloth front panel.