In article om,
Doug wrote:

I have taken some compressed air and blew out any dust (especially off
the speaker) to no avail.

Doug-

As Trevor suggested, there could be a leaky electrolytic capacitor in
the audio amplifier, possibly one connecting the speaker to the
amplifier.

Could liquid have been spilled into the speaker? If the speaker cone
had warped, the voice coil might be rubbing against the magnet's pole
piece. It is possible to apply pressure to a speaker cone in such a way
that you can feel it rubbing (or not) to see if that might be what
causes the fuzzy sound.

Fred