Ключевые слова: 15gd11, 20gds, 20gds3, audio, back, basket, bass reflex, cap, circle, coil, conceptual, core, diffuser, disassembled, dynamic, dynamics, equipment, ferrite, foam rubber, frequency, glue, grids, magnet, magnetic, metal, midfrequency, midrange, midrange speaker, music speaker, musical, player, power, professional, radio factory, radiotehnica, repair, revision, small, soviet, speaker, subwoofer, suspension, system, technology, turntable, tweeter, upgrade, ussr, view, vintage,