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The 3AC-503 speaker system has been produced since 1978 by Vilma Vilnius PSZ. The speakers were included in the package of the Wilma-311-stereo tape recorder, etc. And before that, since 1976, AS "3ÐС-3" was produced, but in a different design. All of these speakers are the same and are different GOST-s and loudspeakers. Broadband AC "8AC-220" (3AC-3, 3AC-503) with phase inverter is designed to work with household radio equipment of 3 and 4 classes. The speaker enclosure is made in the form of a rectangular box made of plywood, veneered and varnished. The loudspeaker is located in the center, shifted up and protected by a decorative overlay. Below is a phase inverter. On the back wall of the speakers there is a mount for hanging speakers on the wall (not at all). The frequency range is 100 ... 10000 Hz. Sensitivity 90 dB. Rated power input 3, long-term 6 watts. 4 ohm impedance. Dimensions of speakers 370x260x190 mm. Weight 6 kg.