Sangean RCR-10 - Manual (Page 19)

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FM stereo (auto) / mono
If the FM radio station being listened to has a weak signal some hiss
may be audible. It is possible to reduce this hiss by forcing the radio to
play the station in mono rather than stereo.
1. Press the Source button as needed to select the FM radio mode
display and tune to the required FM station as previously described.
2. Rotate the Tuning control until the FM Stereo / mono setting shows
on the display. If the setting is Auto press the Tuning control to
switch to Mono mode to reduce the hiss.
3. To return to Auto (stereo) mode press and release the Tuning control
to alter the setting, so that the radio will switch back to Auto mode.