Pioneer VSX-9040TXH - 110 Watt x 7 Direct Energy Amplification Receiver Operating Instructions Manual page 84

10 The Advanced MCACC menu
How to interpret the graphical output
The graph shows decibels on the vertical axis and time (in
milliseconds) on the horizontal axis. A straight line
indicates a flat-response room (no reverb), whereas a
sloping line indicates the presence of reverberation when
outputting test tones. The sloping line will eventually
flatten out when the reverberant sound stabilizes (this
usually takes about 100 ms or so).
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.
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).
Level
Acoustic Cal. EQ Pro.
calibration range
0
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:
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.
84
En
1
Test tone
Conventional MCACC
EQ calibration range
80
160
• 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.
Level
Acoustic Cal. EQ Pro.
calibration range
0
• 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.
Level
Acoustic Cal. EQ Pro.
calibration range
0
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
Time
with your speaker system. It is best to try and see what
(in msec)
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.
1c.Manual MCACC
A/V RECEIVER
1. Fine Channel Level
2. Fine SP Distance
3. Standing Wave
4. EQ Adjust
5. EQ Professional
Exit
Low
frequencies
High
frequencies
Conventional MCACC
EQ calibration range
80 160
Front L
Front R
Conventional MCACC
EQ calibration range
Time
80 160 (in msec)
1c5.EQ Professional
A/V RECEIVER
a. Reverb Measurement
b. Reverb View
c. Advanced EQ Setup
Return Exit
Time
(in msec)
Return