Agree with Sounds real, periodically check all your fastening screws.
Screws will back out over time from vibrations in particle board including shifts in climate especially with medium and high density fibre boards when directly fastened into.
Many speaker cabinets of today are constructed with inexpensive mdf and hdf which are poor materials to directly fasten a screw into, ask any competent cabinet maker.
However checking for loose screws should be part of your system maintenance which ever fastening method used and material your speaker cabinets are made of.
From your description you will most likely find this is the problem. You may get away with simply tightening the screws.
Or
There are many great adhesives available, buy one that is suitable for the screw and particle board.
For the drivers themselves use a drop of motor cycle nut and bolt adhesive, Lock Tight brand or similar.
Screws will back out over time from vibrations in particle board including shifts in climate especially with medium and high density fibre boards when directly fastened into.
Many speaker cabinets of today are constructed with inexpensive mdf and hdf which are poor materials to directly fasten a screw into, ask any competent cabinet maker.
However checking for loose screws should be part of your system maintenance which ever fastening method used and material your speaker cabinets are made of.
From your description you will most likely find this is the problem. You may get away with simply tightening the screws.
Or
There are many great adhesives available, buy one that is suitable for the screw and particle board.
For the drivers themselves use a drop of motor cycle nut and bolt adhesive, Lock Tight brand or similar.