Hyundai H-CMD4004 - Manual (Page 35)

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You should select the item at night.
RF REMOD: It can make the volume level higher. You should select it at daylight.
DYNAMIC RANGE
After selecting the compression mode of LINE OUT, set the item, so you can adjust the linear compression
ratio. If you set it to be FULL, the Peak-to-Peak value of the audio signal is the minimum; if you set it to be
OFF, the Peak-to-Peak value is the maximum.
DUAL MONO
Stereo: stereo output signal.
Mono L: left output signal.
Mono R: right output signal.
Mix Mono: left and right output average signal.