In article ,
Maurice Batey wrote:
Have you a mono button on your system? What happens if you press this - to
the sound from the speakers and headphones?

Much to my amazement, when I switched the FM mode to 'mono' the audible
output from the speakers went lower and muffled - much like the mic.
speech on ClassicFM! The very opposite of what one would expect.

Sounds like some sort of crosstalk or phase problem. The announcer will be
in mono while the music will be in stereo. If you take two channels of the
same mono and invert the phase of one, you'll get near absolute
cancellation of the signal. If you attenuate one or the other only part
cancellation. Stereo may appear at first to be less effected, depending on
content, since the two channels ain't identical.

If an external source like a CD is fine, I'd *guess* at a problem with the
multiplex decoder in the FM tuner.

--
*Reality is a crutch for people who can't handle drugs.

Dave Plowman London SW
To e-mail, change noise into sound.