Sansui WLD+201L User Manual page 34

Audio settings
By default, all stereo stations are reproduced in stereo.
For weak stations, this may result in a poor signal-to-
noise ratio (hiss). To play weak stations in mono, select
Menu > Audio setting > FM weak reception: Listen in
mono only > Yes.
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© Sansui UK 2012 WLD+201 IB Ver 1.0 Rev 0.0