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Since 1986, the Loudspeaker design set has been produced by the Nalchik Semiconductor Instrument Plant. The design set is intended for the development of labor and amateur skills in children of middle school age. On the basis of a set consisting of body plastic parts and components, a working subscriber loudspeaker can be assembled. Characteristics of the assembled loudspeaker: Rated voltage supplied to the input (plug) of the loudspeaker 30 V. The input resistance is 6 kΩ. The range of reproducible sound frequencies is 250 ... 5000 Hz. The dimensions of the loudspeaker are 56x100x200 mm. Weight 0.6 kg. CED 5%. The length of the connecting wire is 1.6 m. The designer was produced in several versions of the structural and external design.