25AS-421 1979
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Acoustic systems "20MAS-1", "20AS-2" and "Electronics B1-01" have been manufactured by the Kazan Radio Components Plant since 1975. All speakers are the same and were included in the sets of electrophones "Electronics B1-01" and "Phoenix-001-stereo", and were sold separately. Speakers are designed to work with high-end radio equipment. Rated power: 20 watts. Resistance: 16 Ohms. The range of frequencies: 40 ... 18000 Hz. Uneven frequency response of sound pressure: ± 9 dB. Mean sound pressure: 0.15 Pa. Maximum input voltage: 18 V. KNI sound pressure at the rated power,%, at frequencies, Hz: 63 - 10, 80 -10, 125 - 8, 200 ... 400 - 4, 400 ... 2000 - 3, Over 2000 - 3. Dimensions: 630x340x250 mm. Weight: 21 kg. Price 135 rubles. Since 1979, the plant produced a similar speaker with the name "25AS-421".
Information from collection of Valery Khartchenko