Denon AVR-4806CI Room EQ function, Press the ROOM EQ button.

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Basic Operation
Flat:
This the frequency response of all speakers flat.
This is suitable for multi-channel music reproduction, from
discrete music sources such as Dolby Digital 5.1, DTS,
DVD-Audio and Super Audio CD.
Room EQ function
Press the ROOM EQ button.
•The Room EQ switches as follows each time the ROOM
EQ button is pressed.
OFF Audyssey Front Flat Manual
The MultEQ XT indicator also lights red if the “Speaker
Configuration”, “Delay Time”, “Channel Level” or
“Crossover Frequency” is set manually after conducting
the Auto Setup procedure.
•The AVR-4806CI’s Auto Setup / Room EQ function offers
three correction curves: “Audyssey”, “Front”, “Flat”. The
timbre of the speakers can also be adjusted manually using
a graphic equalizer.
Details of the different correction curves are described
below.
Audyssey:
This adjusts the frequency response of all speakers to
correct the effects of room acoustics.
Front:
This adjusts the characteristics of each speaker to the
characteristics of the front speakers.
•The “Audyssey”, “Front” and “Flat” Room EQ curves can
be selected after performing the Auto Setup procedure.
Manual:
Selects the setting value that was set in the Manual EQ
Setup.
For details of the “Manual EQ Setup” ( page 113, 114).
ROOM EQ
ROOM EQ
The “Audyssey” is selected, the MultEQ XT indicator
lights green.
The “Front” or “Flat” is selected, the MultEQ XT
indicator lights red.
The “DIG.” indicator lights when digital signals are being
input properly. If the “DIG.” indicator does not light, check
whether the “Digital In Assign” ( page 99, 100) and
connections are correct and whether the component’s
power is turned on.
AL24 processing is activated when PCM signals are played
while the surround mode is set to PURE DIRECT, DIRECT,
STEREO, MULTI CH PURE DIRECT, MULTI CH DIRECT or
MULTI CH IN.
NOTE:
•The “DIG.” indicator will light when playing CD-ROMs
containing data other than audio signals, but no sound will
be heard.