Acoustic system '' Estonia 35AS-021 ''.

Acoustic systems, passive or active, as well as electro-acoustic units, hearing aids, electric megaphones, intercoms ...Passive speaker systemsSince 1985, the acoustic system "Estonia 35AS-021" has been produced by the Punane-RET Tallinn plant. Three-way speaker with bass reflex is designed for high-quality reproduction of music programs in stationary household conditions. A special feature of the speaker is its reduced size, the use of a flat honeycomb diaphragm in the woofer and a domed membrane made of expanded polystyrene paper in the tweeter heads. The range of operating frequencies of sound is 25 ... 31500 Hz. Uneven frequency response - 16 dB. Average characteristic sensitivity level 85 dB. Frequency response ± 4 dB. Total harmonic distortion in the range 250 ... 1000, 1000 ... 2000 and 2000 ... 6300 Hz 1.6, 1.5 and 0.8%. Resistance 8 ohms. Maximum power 50 watts. Speaker size - 320x320x540. Weight 19.5 kg. Since 1991, the plant has been producing AC - "35AC-021-1", which is distinguished by the use of other midrange and high frequency heads that do not have protective nets, but only two curved metal rods running along the midrange and high frequency heads for mechanical protection. Since 1992, the next modernization, АС "35АС-021-2", differed from АС - "35АС-021-1" by the use of other low-frequency heads of a conical design with a paper diffuser.