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The subscriber loudspeakers Meshchera, models 301 and 302, have been producing the Ryazan Radio Factory since 1990. AG Meschera-301 is designed to work in a radio network of wired radio broadcasting with a voltage of 30 V, and "Meshchera-302" in a radio network with a voltage of 15 V. Structurally, the devices are made the same way and are distinguished by individual circuit elements. The frequency range of 160 ... 7000 Hz, with uneven frequency response of 15 dB. The average sound pressure of 0.25 Pa. Harmonic coefficient 3%. 35 dB volume control range.