acoustic system radiotehnica s90, 35 s-012. soviet vintage audio equipment. musical columns made of plywood

old soviet acoustics s90 speakers radiotehnica musical powerful 35 watts 90 nominal veneer brown acoustic twitter midfrequency lowfrequency bass grids speaker ussr vintage riga radio factory engineering background brick wall antique 1985 retro view 35as012 power record loud small rectangular dynamic wooden object sixties decoration nostalgia spool isolated music analog detail system membrane