high frequency speaker soviet-made 3gd-31, 5 gdv-1-8 . revision and repair of vintage acoustics

soviet paper tweeter twitter vintage ussr vega speaker system 3gd31 gdv18 glue case pva white wooden sealing antivibration silk membrane disassemble high frequency studio interior car carbon fiber audio music destroyed subwoofer disassembled repair media professional magnetic revival plastic exfoliated antique black square loud diffusor beat upgrade shelf small power