an antique soviet woofer 5gd-3 from vintage acoustics symphony

1960s 5gd3 60s 70s acoustics alnico antique archive bracket broadcast cap cardboard case cases cast chart cobalt desk disc dj eavesdropping entertainment frequency funky gray jockey listening loft melody old perforation plywood radio rare reel report resistance resonant retro shielding song soviet speak speaker speakers strut symphony threeway to vintage voice woofer