disassembled speaker case 15as-208. repair speakers. column speaker 15as-208. vintage soviet bookshelf acoustics

soviet speaker system disassembled case 15as208 repair speakers panel shield plastic black tweeter 3gd31 gdv18 revision restoration audiophilia vintage shelf acoustics abandoned destroyed passive radiator bass twoway veneer exfoliated 15gdn technology design object frequency decoration old wooden song ancient listen equipments media stereo revival musical ussr record audio loudspeaker electronic