FIELD: direct radiation electrodynamic loudspeaker for hi-fi acoustic systems. SUBSTANCE: device cone is designed as spiral frame-less winding, which is made from aluminum conductor, which coils are glued. This design prevents generation of stationary waves, but easily transmits sound coil oscillations. In addition cone coils may be used as feedback detector. EFFECT: improved sound quality. 2 cl, 2 dwg
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