dynamics of soviet acoustics. an acoustic column with mesh removed from the speakers

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 broadcast classic reflex loud wooden object turntable spool player pattern isolated style ancient coil preservation membrane electronic 35as texture rectangular