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The System Setup menu
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By analyzing the graph, you should be able to see how
your room is responding to certain frequencies.
Differences in channel level and speaker distance are
taken into account automatically (compensation is
provided for comparison purposes), and the frequency
measurements can be examined both with and without
the equalization performed by this receiver.
1
Setting Acoustic Calibration EQ Professional
according to your room characteristics
Using the manual setup, you can set the time period at
which the frequency response is analyzed, pinpointing
the time that is best for system calibration with your
particular room characteristics.
The graph below shows the difference between
conventional acoustic calibration and professional
calibration (the gray circle indicates the point where the
microphone captures sound during frequency analysis).
As soon as audio is output from your speaker system, it
is influenced by room characteristics, such as walls,
furniture, and the dimensions of the room. The sooner
the frequency analysis, the less it is influenced by the
room. We recommend an earlier time setting of
30~50ms
to compensate for two major factors that will
influence the sound of most rooms:
•
Reverberance of high vs. low frequencies
–
Depending on your room, you may find that lower
frequencies seem overly reverberant compared to
higher frequencies (i.e. your room sounds ‘boomy’).
This may result in a skewed frequency analysis if the
measurement is done too late.
•
Reverb characteristics for different channels
–
Reverb characteristics can be somewhat different for
each channel. Since this difference increases as the
sound is influenced by the various room
characteristics, it is often better to capture a
frequency analysis early on for smoother mixing of
channel frequencies/sounds.
If your room isn’t affected by the factors above, it is often
not necessary to make a
30~50ms
setting. Later time
settings may provide a more detailed sound experience
with your speaker system. It is best to try and see what
works best for your particular room.
Note that changing the room (for example, moving
furniture or paintings) will affect the calibration results.
In such cases, you should recalibrate your system.
Using Acoustic Calibration EQ Professional
1 Select ‘EQ Professional’ then press ENTER.
2 Select an option and press ENTER.
•
Reverb Measurement
– Use this to measure the
reverb characteristics of your room (for graphical
output using a PC, see
Connecting a PC for Advanced
MCACC output
on page 61 to connect an RS-232C
cable before selecting this option).
•
Reverb View
– You can check the reverb
measurements made for specified frequency ranges
in each channel.
•
Advanced EQ Setup
– Use this to select the time
period that will be used for frequency adjustment and
calibration, based on the reverb measurement of
your listening area. Note that customizing system
calibration using this setup will alter the settings you
made in
Automatically setting up for surround sound
(MCACC & Full Band Phase Control)
on page 8 or
Automatic MCACC (Expert)
on page 37 and is not
necessary if you’re satisfied with these settings.
Note
1 Note that due to an effect known as ‘group delay’, lower frequencies will take longer to be generated than higher frequencies (this is most obvious when
comparing the frequencies at 0 ms). This initial slope is not a problem (i.e. excessive reverb) with your listening room.
0 16080
Test tone
Time
(in msec.)
Level
Acoustic Cal. EQ Pro.
calibration range
Conventional Acoustic Cal.
EQ calibration range
0 16080
Low
frequencies
High
frequencies
Time
(in msec.)
Level
Acoustic Cal. EQ Pro.
calibration range
Conventional Acoustic Cal.
EQ calibration range
0 16080
Left
surround
Right
Surround
Time
(in msec.)
Level
Acoustic Cal. EQ Pro.
calibration range
Conventional Acoustic Cal.
EQ calibration range
:Return
a. Fine Channel Level
b. Fine SP Distance
c. Standing Wave
d. EQ Adjust
e. EQ Professional
3. Manual MCACC
DVD/LD
-
55.0
dB
:Return
1. Reverb Measurement
2. Reverb View
3. Advanced EQ Setup
e.EQ Professional
3e. EQ Professional
DVD/LD
-
55.0
dB
ENTER:Next
VSX_LX60LX70.book 44 ページ ２００７年７月１８日 水曜日 午前１０時１９分