acoustic caps for mid frequency speakers in vintage acoustics symphony 2

radio old caps damper distortion 3d1 midfrequency cotton wool pass cardboard cases speakers symphony retro acoustics 1960s 60s 70s helmholtz resonator threeway system fabric veneer plywood strut ussr soviet lamp varnished vintage player home propaganda hipster audiophile hit commentator party reportage rap musical design broadcasting singer wooden classic report art monitoring recording studio