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Acoustic systems "Electronics 25AS-227" and "Amfiton 25AS-227" since 1984 produced the Leningrad plant Ferropribor and Lviv PO them. Lenin. Three-way speakers with phase inverter '' Electronics 25AC-227 '' and '' Amphiton 25AC-227 '' are similar, made in mirror image and are intended for high-quality playback of phonograms as part of an amplification equipment complex of the highest complexity. The LF functions are performed by the 25GD-42 head, the MF 15GD-11 head, and the high-frequency isodynamic head 10GI-1. The magnetic system of the head consists of 2 parallel rows of magnets, and the flat membrane is made of a polymer film on which a voice coil is applied. It provides an inertia-free radiation mode, which expanded the frequency range to 31.5 kHz, reducing nonlinear and phase distortions. The speakers are made in cases of pressed chipboard, covered with a thin film with imitation of valuable rocks. Rated power input 25 watts. 4 ohm impedance. The operating frequency range is 31.5 ... 31500 Hz. The average sound pressure is 1.2 Pa. Speaker dimensions - 320x600x320 mm. Weight 25 kg. The price of one speaker is 145 rubles. Since 1986, the AU was referred to as "Electronics 25AS-027" and "Amfiton 25AS-027".