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Acoustic two-way system with a phase inverter "10AS-9" was produced from the beginning of 1978 by the Riga Radio Plant named after A.S.Popova. The speakers were part of the Melody-106-stereo MC. The body of the AU is made in the form of a rectangular non-separable box of chipboard, covered with externally natural veneer. The front side of the speaker panel is covered with a plastic trim. The woofer is located at the bottom of the speaker in the center of the vertical axis. The tweeter is above the woofer and shifted to the left. To the right of the RF there is a phase inverter output. An electric filter and sound-absorbing material are located inside the speaker. The range of reproduced sound frequencies is 63 ... 18000 Hz. Sensitivity 85 dB. Input impedance 4 ohms. Rated power 10 watts. Maximum power 25 watts. Used loudspeakers: LF / MF: 25 GDN-1-4 (10 GD-34). HF: 6 GDV-1-16 (3 GD-2). Speaker dimensions - 360x210x177 mm. The mass of one speaker is 5 kg. From the beginning of 1979, the AU was referred to as "10ÐС-409", from 1983 as "10ÐС-209" and "10ÐС-408".