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Acoustic system "Estonia 35AS-021" since 1985 produced the Tallinn plant Punane-RET. A three-way speaker with a phase inverter is designed for high-quality reproduction of musical programs in stationary living conditions. A special feature of the AU are the reduced dimensions, the use of a flat cellular diaphragm in the low frequencies and a dome membrane made of polystyrene paper in the high-frequency heads. The operating frequency range of the sound is 25 ... 31500 Hz. Irregularity of the frequency response - 16 dB. The level of the average characteristic sensitivity of 85 dB. Irregularity of frequency response ± 4 dB. The total harmonic coefficient in the range of 250 ... 1000, 1000 ... 2000 and 2000 ... 6300 Hz is 1.6, 1.5 and 0.8%. Resistance 8 ohm. The maximum power of 50 watts. The size of the AU - 320h320h540. Weight 19.5 kg. Since 1991, the plant has been producing AC - "35AS-021-1", differing in the use of other MF and HF heads that do not have protective nets, but only two bent metal rods extending along the MF and HF heads for mechanical protection. Since 1992, the next upgrade, AS "35ÐС-021-2" was different from the AU - "35ÐС-021-1" using other bass heads of the tapered design with paper duffusor.