Sangean U4 DBT (V1) - Manual (Page 19)

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Dynamic Range Control (DRC) - DAB
The DRC facility can make quieter sounds easier to hear when
your radio is used in a noisy environment.
There are three levels of compression:
DRC Off No compression applied. (default)
DRC High Maximum compression applied.
DRC Low Medium compression applied.
. Press the Power button to switch on your radio.
. Press and release the Source button until the DAB band is selected.
3. Press and release the Menu button until the Advanced DAB
menu shows on the display.
4. Rotate the Tuning control until 'DRC ' appears on the display.
Press and release the Tuning control. The display will show the
current DRC value which will be marked with an asterisk.
5. Rotate the Tuning control to select the required DRC setting
(default is off).
6. Press and release the Tuning control to confirm the setting. After
several seconds the display will return to the normal radio display.
Note:
Not all DAB broadcasts are able to use the DRC function. If the
broadcast does not support DRC, then the DRC setting in the radio
will have no effect.