"Jim Lesurf"

The 'buzzing' you report is useful as a symptom. It rules out various
things which other behaviour might have caused. The speaker being damaged
sounds plausible, although it might perhaps be something else like a poor
connection rattling or a loose wire against the cone.


** If you were a service tech Jim, you would FIRST suspect a foreign
object.

It's an electric piano - so the speakers typically face upwards through a
slotted grille that small objects can fall through.

Makes a nasty distorted sound that is very level and note dependant.

Occam's Razor rules...........




..... Phil