How to Interpret the Graphs

As indicated in Things you can accomplish with this application (page 3), the reverb characteristics graph can be used as reference when determining the calibration time position with the receiver’s “Advanced EQ Setup” function. It is also a valuable means for checking the effect of measures taken to improve the acoustics of the room. The display can be switched between the reverb characteristics graphs before and after calibration. For details, see About the display of the reverb characteristics graphs before and after calibration (page 23).

How to interpret reverb graphs (Reverb)

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.

Note

•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 0 ms).

•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.

•Since channel level and speaker distance settings are displayed in the graphical output, it is best to make sure these settings (made in the Auto MCACC “ALL” or “Channel Level” setup) are adjusted properly before reverb measurement.

•Even in cases where there is a great difference in the output levels of different frequencies (the frequency characteristics of the room are poor), the frequency characteristics of individual channels can be set closer to flat using the “SYMMETRY” or “ALL CH ADJ” calibration settings in the receiver’s “Auto MCACC” function. (For details, see page 78 of 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.)

•There may be differences on the reverb characteristics graphs after measurements with the Full Auto MCACC function as compared to after measurements with the Reverb Measurement function (Manual MCACC  “EQ Professional”) due to the standing wave control setting. With Full Auto MCACC, the reverberations are measured with standing wave controlled, so the reverb characteristics graph does not reflect the influence of the standing waves. By contrast, with Reverb Measurement, the reverberations are measured without standing wave control, so you can check the reverb characteristics including the influence of the standing waves. If you want to check the acoustics of the room (with the standing waves), we recommend using Reverb Measurement.

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VSX-9140TXH, VSX-9040TXH, VSX-23TXH, VSX-21TXH specifications

Pioneer has long been a frontrunner in the audio visual receiver market, and its VSX series is a testament to the brand's commitment to delivering high-quality home theater experiences. The VSX-21TXH, VSX-9040TXH, VSX-23TXH, and VSX-9140TXH are standout models that offer an impressive array of features, technologies, and characteristics.

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Moving on to the VSX-9040TXH, this model elevates the audio experience with its advanced Class D3 amplification technology. This innovative design delivers high efficiency while minimizing power consumption. The VSX-9040TXH supports both wired and wireless surround sound setups, featuring built-in Wi-Fi and Bluetooth connectivity. This model is particularly user-friendly, boasting an intuitive GUI that enables easy navigation and setup.

The VSX-23TXH adds further functionality with its inclusion of multi-zone audio capabilities, allowing users to enjoy different audio sources in separate rooms simultaneously. This model also features advanced sound optimization technology, such as MCACC (Multi-Channel Acoustic Calibration System), which automatically calibrates audio settings based on the room’s acoustics to deliver the best sound quality.

Lastly, the VSX-9140TXH represents the pinnacle of the VSX series with its 9.2 channel surround sound. This receiver is designed for true audiophiles, delivering exceptional sound clarity and richness in all audio formats. It offers support for the latest surround formats, including Dolby Atmos and DTS:X, which enable immersive three-dimensional sound experiences. Additionally, the receiver features a high-resolution audio playback feature, supporting formats such as FLAC and DSD for those who crave studio-quality sound.

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