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Acoustic system "15AS-221" was produced since 1987 by the Kiev plant "Mayak". The AU was produced under the new name of the new GOST and is absolutely similar to the model "10AS-318" produced since 1985 The speakers were supplied with the Beacon M-233C tape recorder. Specifications: Wideband speaker closed type. Frequency range: 100 ... 16000 Hz. Irregularity of the frequency response: 14 dB. Sensitivity: 90 dB. Resistance: 4 Ohms. Rated power: 10 watts. Long-term power: 15 watts. Short-term power: 20 watts. Used head: 10 GDSH-1-4. Dimensions AC 430x270x230 mm. Weight 7.5 kg.