Pioneer VSX23TXH Owner's 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.1 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 Test tone Acoustic Cal. EQ Pro. calibration range Conventional MCACC EQ calibration range Time 0 80 160 (in msec) 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: • 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 Low frequencies High frequencies Acoustic Cal. EQ Pro. calibration range Conventional MCACC EQ calibration range Time 0 80 160 (in msec) • 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 Front L Front R Acoustic Cal. EQ Pro. calibration range Conventional MCACC EQ calibration range Time 0 80 160 (in msec) 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. 1c.Manual MCACC A/V RECEIVER 1. Fine Channel Level 2. Fine SP Distance 3. Standing Wave 4. EQ Adjust 5. EQ Professional 1c5.EQ Professional A/V RECEIVER a. Reverb Measurement b. Reverb View c. Advanced EQ Setup Exit Return Exit Return 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