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Acoustic systems "10ÐС-328" and "15ÐС-223", respectively, from 1988 and from 1989 were produced by the Kiev factory "Mayak" These speakers, like some others, were bundled with the Mayak M-240S and Mayak M-240S-1 tape recorders. Broadband speakers with bass reflex. The range of reproducible frequencies is 100 ... 16000 Hz. Irregularity of the frequency response - 14 dB. Sensitivity 90 dB. 4 ohm impedance. Rated power 10 watts. Long-term power 15 watts. Short-term power of 20 watts. Used dynamic head: 10ГДШ-1-4. Speaker dimensions - 385x265x196 mm. Weight - 5.5 kg.