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Acoustic system "15AS-4" was produced from the beginning of 1976 by the Berdsk radio plant. Along with other similar speakers, these speakers were equipped with the "Vega-104M stereo", "Vega-108-stereo" and "Vega-117-stereo" combined devices. AC - two-way. Applied loudspeakers 25GD-26 and 3GD-31. Rated power input 15 watts, maximum 25 watts. The nominal frequency range is 63 ... 20000 Hz. Speaker dimensions - 420Ñ…250Ñ…190 mm. Weight - 8 kg. Presumably, since 1979 and 1983, ACs were issued with the names "15AS-404" and "15AS-204".