Lifting the speakers from the grid is to isolate vibrations not metal to metal. I had a wall speaker do this once caused from a bad bearing in a ventilation fan. The fan would vibrate the wall and the speaker cone would start vibrating causing a loud static like noise. I doubt this is the problem here but it may be worth a try.


Merritt

Business Telephones & Equipment + Commercial Audio/Video Products
Commercial Communications . . . Turner, Maine
If it was built after 1980 don't expect it to work right.