probably a wire routed too close to a bare wall or a driver magnet. take each upper driver out. As you pull it out note the wire routing and look for the source of the rattle.
Jerry
Help needed with Rattle in my floorstanding speakers.
Help and suggestions needed with a rattling noise in my speakers.
I was playing a song called fading sun by Terje Isungset and it has the deepest bass note I have ever heard and one of my floorstanding speakers had a very noticeable rattle that I can hear coming from the upper part of the cabinet with the lowest bass note of the track. Not sure why but what is your recommendation to locate and hopefully fix this rattle. Thank you!