User manual PIONEER VSX-AX5AI-S annexe 1

[. . . ] Advanced EQ Setup, which you can do with the receiver (see page 92 in the receiver's Operating Instructions), allows you to choose the optimum time period for auto EQ setup. You can use the graphs displayed by the application as a guide in choosing the best time period for your room. For details, see How to Interpret the Graphs (page 14). Skewed reverb frequency characteristics in your listening room can prevent you from enjoying an accurate sound field. [. . . ] Data received at one time is saved in one file. 1 To save measure data, choose "Save" from the "File" menu. If you have data that has already been saved and want to save it under a new name, choose "Save As. " 2 Check the save location, assign a file name, then click "Save. " The data is saved in a CSV format file (the file extension is ". csv"). When you are finished saving data, you should return to the receiver and select "Exit" on the on-screen display. This takes the receiver out of transmission standby mode. (See page 79 in the receiver's Operating Instructions. ) Note The CSV format file is often used to transfer data to applications such as databases and spreadsheets. You can use these applications to view the numeric values in your measurement data. However, if you use another application to edit the data and then save the file, the Advanced MCACC application may be unable to open the file. 12 Application Operations (Continued) Opening data files You can open and display two or more data files to compare the data in the files. 1 Select "Open" from the "File" menu in the menu bar. 2 Select a file to display and click "Open. " Graphs appear for the data saved in the file. Exiting the application 1 Select "Exit" from the "File" menu. The application closes. 13 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 B. 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. If you calibrate the receiver using ALL CH ADJUST of the standard Acoustic Cal EQ, data will be acquired in the 80 to 160 msec range (the red area of Figure 2). The analysis concludes that low frequencies are too loud and high frequencies are too soft, so it adjusts the equalization curve to strengthen high frequencies. In fact, however, the high frequencies may already be loud enough if measured within 40 msec, which is the time it takes for sounds coming directly from the speakers to reach your ears. Therefore, the standard Acoustic Cal EQ may result in a room where high frequencies sound shrill. In cases like this, setting the time period for Advanced EQ Setup to 20 to 40 msec (the blue area in Figure 2) to adjust for sounds coming directly from the speakers can flatten the frequency response for direct sounds (including initial reflections) and give a better-balanced sound field. Figure 2 Low frequencies High frequencies Level (dB) Time period point to be selected Time (in ms) 15 How to Interpret the Graphs (Continued) Pattern 2: Different reverb characteristics for different channels When different channels can have different reverb characteristics, as shown in Figure 3, it is not so effective to calibrate using the standard Acoustic Cal EQ. In general, a sound field with good acoustic positioning and movement is made up by sounds coming directly from the speakers (including initial reflections). This is the reason why you should use a calibration method that enables you to adjust direct sounds. In pattern-2 cases, the standard Acoustic Cal EQ is not able to adjust frequency characteristics for sounds coming directly from the speakers. It acquires data in the 80 to 160 msec range (the red area in Figure 3. ), so its adjustment ability is limited to sounds 80 msec or longer. In cases like this, you should use Advanced EQ Setup and set the time period to 20 to 40 msec (the blue area in Figure 3). This allows the characteristics of direct sounds to be balanced for each channel, giving an ideal sound field with good acoustic positioning and movement. Figure 3 Front left channel Level (dB) Time period point to be selected Time (in ms) Front right channel Pattern 3: Similar reverb characteristics for high and low frequencies and all channels As shown in Figure 4, when the reverb characteristics for all channels are similar across all frequencies, your sound experience will probably not be adversely affected by reverberation. [. . . ] (This message indicates that the receiver is ready to send data to the PC. ) 2) Check that the RS-232C cable is properly connected. (Be sure to switch off all components and disconnect their power cord from the power outlets before changing any cable connections. ) 3) Exit any other active applications. 5) Check the type of RS-232C cable to use is correct (page 5). 6) Restart the Advanced MCACC application. [. . . ]