Bedienungsanleitung Pioneer VSX-9140TXH (Seite 84 von 123) (Englisch)

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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 cer tain 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 t

is 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 cap tures 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 a

nalysis, 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 an

aly

sis 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

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.

Level

Test tone

Acoustic Cal. EQ Pro.

calibration range

Conventional MCACC

EQ calibration range

Time

(in msec)

160

Level

Low

frequencies

Acoustic Cal. EQ Pro.

calibration range

Time

(in msec)

80 160

High

frequencies

Conventional MCACC

EQ calibration range

Level

Front L

Acoustic Cal. EQ Pro.

calibration range

Time

(in msec)

80 160

Front R

Conventional MCACC

EQ calibration range

1. Fine Channel Level

2. Fine SP Distance

3. Standing Wave

1c.Manual MCACC

4. EQ Adjust

5. EQ Professional

A/V RECEIVER

Exit Return

a. Reverb Measurement

b. Reverb View

c. Advanced EQ Setup

1c5.EQ Professional

A/V RECEIVER

Exit Return

VSX-9140TXH_CUXJ.book 84 ページ２００９年４月１６日　木曜日　午前１０時３６分

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