A month or so ago there was a flurry of posts about buzz in the
speaker. On poster replaced fiber washers used to mount the
speakers with neoprene and reported good results.
With my sidetone level set at about 45, I heard pronounced buzzing
at 350 and 400 Hz sidetones. (Adjust your sidetone level with MON,
then go to PITCH and adjust the sidetone pitch throughout its range.)
Since I had to pop the top to install my back ordered 6kHz filter, I
took the opportunity to replace the fiber washers with improvised
ones made from small grommets sliced in half. I did get some improvement.
Now the major buzz is limited to 350 Hz. In putting some slight
finger pressure at various places on the top cover, I see that the
speaker isn't at fault but that the top plate has some
resonances. I'm thinking of putting some kind of resonance killers
on the underside, maybe some globs or beads of RTV or similar, so as
to avoid any kind of permanent change to the rig.
Car stereo installers use a thin but heavy black mat with adhesive on
one side to dampen resonances in door panels.
It's also used on the inside walls of computer cases to dampen fan noise.
A few of their throw-away scraps stuck on the inside of the cover
would probably fix you right up.
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