Pioneer VSX-AX5Ai-S Manuel d'utilisateur télécharger pdf (Page 14)

How to Interpret the Graphs

As explained in

Things you can accomplish with this application

on page 2, you can use the graphs

displayed in this application to choose the optimum time period for auto EQ setup with the receiver’s

Advanced EQ Setup function, and to check the effectiveness of steps you take to improve the acoustics of

your listening room.

Note

• Acoustic Cal EQ of the receiver adjusts five frequency bands of 63Hz, 125Hz, 250Hz, 4kHz, and

11.3kHz; however, the reverb characteristics are shown in six frequency bands of 63Hz, 125Hz, 250Hz,

1kHz, 4kHz, and 11.3kHz on the screen.

In automatic setting of Acoustic Cal EQ, it is designed so that the characteristics of the speaker and the

listening room are measured and analyzed in the six frequency bands including 1kHz, and then the

parameter of Acoustic Cal EQ in the five frequency bands is set based on the analyzed results. (The

relative balance of the six bands is designed to be adjusted using EQ5 bands.) The reverb

characteristics are, however, shown in the six bands, since all the data analyzed are designed for

display.

How to interpret reverb graphs

The graphs show changes in microphone input level along a time axis, beginning from a state of quiet at

time 0, when test tones begin to be output, and continuing while a constant level of sound is output from

the speakers.

• If there is absolutely no reverberation in your room, the graph will look like figure A below.

• If there is reverberation, the graph will show a gradual accumulation of acoustic power, as shown in figure

Notes

• Due to an effect known as “group delay”, lower frequencies may take longer to be generated than higher

frequencies (this is most obvious when comparing the frequencies around 0ms).

• If a graph extends beyond the display range, or almost fills it, you can change the display by using the Z

(Zoom) control on the graph adjustment bar, adjusting the display range of the Level [dB] scale so that

the whole graph is visible.

•In the graphs, 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 the receiver.

• Even in cases where there is a great difference in the output levels of different frequencies (the frequency

characteristics of the room are poor), you can carry out ALL CH ADJUST with the receiver’s Acoustic Cal

EQ function to bring the frequency characteristics for each channel closer to a flat response. (For details,

see page 88 in the receiver’s Operating Instructions.)

• It is usually not possible to calculate the equalization values employed by the receiver’s Acoustic Cal EQ

function simply by viewing the graphs displayed on your PC. (This is because the automatic adjustments

made by Acoustic Cal EQ function take account of factors such as equalization band interference and

analytical filter characteristics, to achieve the optimum characteristic profile.)

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Pioneer VSX-AX5Ai-S Manuel d'utilisateur Page 14