broadband speaker 5gdsh-4-4. old speaker

1960s 5gdsh 5gdsh44 60s 70s acoustics antique art audio bracket broadband broadcasting cardboard cases cobalt design disc disco dj fabric helmholtz home jockey loft mass media melody microphone music old paper plywood radio recording reggae resistance resonator retro sing soviet speaker speakers stamped strut studio symphony system threeway ussr varnished veneer vintage woofer