Bedienungsanleitung Pioneer VSA-AX10i-S (Seite 57 von 104) (Englisch)

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The Surround Setup menu

Professional Acoustic Calibration EQ

This setup minimizes the unwanted effects of room

reverberation by calibrating your system based on the

direct sound coming from the speakers. It can also

provide you with a graphical output of the frequency

response of your room.

Note

• Before setting up with Professional Acoustic

Calibration EQ, you should finish calibrating using

the Auto Surround Setup on page 35.

How to use Professional Acoustic Calibration EQ

If you find that lower frequencies seem overly reverberant

in your listening room (i.e. it sounds ‘boomy’), or that

different channels seem to exhibit different reverb

characteristics, use the auto pro setup to calibrate the

room automatically. This should provide a more balanced

calibration than simply using the standard Acoustic

Calibration EQ. The manual setup allows you to

customize your system calibration with the help of a

graphical output that can be displayed on-screen, or

using a computer (with software available from

Pioneer—see Connecting a PC for Advanced MCACC

output on page 81 for more on this).

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 100ms 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), but the frequency

measurements are always shown without the

equalization performed by this amplifier.

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 0ms). This initial slope is not a problem

(i.e. excessive reverb) with your listening room.

Setting Professional Acoustic Calibration EQ

according to your room characteristics

Using the manual setup, you can set the time period at

which the frequency response is analyzed for calibration.

You can pinpoint the time that is best for calibration of

the system for your particular room characteristics.

The graph below shows the difference between standard

acoustic calibration and professional calibration (the

gray circles represent the point at which the microphone

captures the sound for 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 20–40ms

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 20–40ms 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.

0 16080

Test tone

Time

(in msec.)

Level

Acoustic Cal. EQ Pro

calibration range

Standard Acoustic Cal.

EQ calibration range

0 16080

Low

frequencies

High

frequencies

Time

(in msec.)

Level

Acoustic Cal. EQ Pro

calibration range

Standard Acoustic Cal.

EQ calibration range

0 16080

Left

surround

Right

Surround

Time

(in msec.)

Level

Acoustic Cal. EQ Pro

calibration range

Standard Acoustic Cal.

EQ calibration range

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