Pioneer VSX-709RDS - Manual (Page 41)

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Operation
Using in MIDNIGHT Listening Mode
When the volume is low, surround effects tend to become less than satisfactory. Turn the MIDNIGHT listening
mode on to enjoy the effects of quality surround sound even at low volumes. This mode allows you to hear
effective surround sound of movies at low volume levels.
Press MIDNIGHT.
Each press switches MIDNIGHT listening mode on or off.
The effect automatically adjusts according to the volume level.
Sound Modes
dB
MIDNIGHT