broadband speaker 5gdsh-4-4. old speaker

1960s 5gdsh 5gdsh44 60s 70s acoustics alnico announcer antique art broadband broadcasting cardboard cases chart classic design fabric helmholtz home loft microphone music old paper plywood radio rare recorder recording report resonator retro sing singer song soviet speak speaker speakers stamped strut studio symphony system threeway ussr veneer vintage voice woofer