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Acoustic system "50ÐС-5" (Radiotehnika) was produced from 1974 by the Riga software "Radio engineering". Speakers designed for high-quality sound of small concert halls. At the bottom of the speakers are woofers asymmetrically above each other to improve the frequency response. Phase inverter ports on both sides. At the top of the midrange speakers are located above each other. The tweeter is located at the top center. On the front panel there are knobs for the MF and HF level controls, which have three positions: "Min", "Norm" and "Max". The upper part covers the plastic lining, which closes the level controls, midrange and tweeters. The speakers used speakers: LF (2 pcs.): 30 GD-1 (75 GDN-1-4), MF (2): 15 GD-11 (20 GDS-4-8) and HF (1): 10 GD -35 (10 GDV-2-16). Trepole floor speaker with bass reflex. Frequency range: 20 ... 20000 Hz. Frequency response irregularity: 20 dB. The harmonic coefficient at a frequency of 1000 Hz: 2.5%. Rated electrical resistance: 4 ohms. Rated power input: 50 watts, maximum 100 watts. Average standard sound pressure: 0.1 Pa. The internal volume of the AU - 120 liters. Speaker dimensions - 900x472x290 mm. Weight not more than 42 kg.