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Since the 1st quarter of 1986, the Amfiton 25AS-131 acoustic system produced the Carpathian Radio Plant. The AU is designed for high-quality reproduction of music or speech programs in stationary conditions. The preferred installation option - shelf. The frequency range of 40 ... 25000 Hz. Rated power 25 watts. Uneven frequency response 8 ... 12 dB. 4 ohm impedance. Extreme noise power 50 watts. Speaker dimensions - 300x520x230 mm. Weight 14.2 kg. In the AU, 50GDN-3 is used as the head of the LF, 25GDV-1-8 is used as the MF and HF. The heads are framed with decorative overlays: the pad of the head of the LF of a rectangular shape, ST and HF also, but the middle part has a special shape that improves the frequency response of the sound pressure in the HF region. The internal volume of the AU - 25 dm. To reduce the effect on the frequency response and sound quality of resonances - the internal volume of the case is filled with a sound absorbent from technical cotton wool. Electrical filters are installed inside the AU casing to ensure separation of the bands at a frequency of 3 kHz, and a frequency response of 6 dB per octave is created.