Technics SH-AC500D Operating Instructions Manual page 17

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Other fundions
"Dynamic range compression' IDR COMP) is a funclion for
compressing the dynamic range (reproduction level range) of audio
signals It is used for viewing movie software late at night or al other
times when high volume levels are not desirable
This function only works with DR COMP compatible Dolby Digital
format software
Press DR COMP. []
The "DR COMP" indicator lights
When the button is pressed again, the function is released, and the
indicator goes off.
For your reference:
When DR COMP is on, scenes that already have a low sound level
will be heard as they are When scenes that are loud occur, the
function acts to reduce the peak level
The sound field will remain intact even if DR COMP is functioning.
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DR COMP
Dynamic range compression indicator
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MUTING
DIMMER
Press MUTING.
During muting, the message ='MUTING ON NOW" scrolls across the
display,
When the button is pressed again, the original volume level is
restored. When the unit's power is switched off, muting is canceled.
Press DIMMER. []
The display panel is dimmed.
When the button is pressed again, or when the unit's power is
switched off, the original brightness is restored.