Alpine PXE-C80-88 Owners Manual - Page 23
Tuning
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Tuning With measurement complete, you are ready to tune the sound in the vehicle. Tuning screen This section is an introduction to the tuning screen. It will cover the controls shown on the screen without discussing procedure. Distortion & Noise (magenta) - This curve shows the distortion and noise that were present during your measurement. Tuning Process This section covers the standard procedure using the tuning screen to create your EQ. 1 Check the Distortion & Noise Level Before proceeding, we must check the Distortion & Noise curve relative to the Measurement curve. To make this easier, you may turn off display of all other curves. Where the Distortion & Noise curve comes too close to the Measurement curve, that means there is too much noise to rely on this measurement in that frequency range. The Distortion & Noise curve should be at least 10 dB below the Measurement curve. If it is 6 dB or closer, that frequency range of the measurement is unreliable. Figure 6 - The tuning screen with its default options shown. 1 Side Panel Controls These are the controls available outside of the main graph area: EQ Gain Offset - This setting adjusts the boost and cut of the EQ. This will be the first step in your tuning process. Reset to Default - This button resets everything on this tuning screen to defaults. Bypass EQ - This toggle allows you to A/B test the sound with the EQ on and off. Level - This slider controls the volume of the music source. 2 Graph Curves These are the curves shown in the main graph area. The display of each one can be toggled on and off. Target (yellow) - This is the curve which you will manipulate to tune the system. AutoEQ will match your system's sound to this curve. Measurement (dark teal) - This is the measured APVD of your car's system. EQ (blue) - This is the correction curve AutoEQ will apply in order to achieve your target curve. Predicted (gray) - This curve shows what the predicted result from your target curve will be. It will vary slightly from the target (yellow) curve, or may be hidden behind it if AutoEQ is going to hit your target exactly. Figure 7 - The tuning screen showing an unacceptable high amount of noise. It is expected that the Distortion & Noise curve will approach the Measurement curve in the very low frequency ranges. This will be in the frequency range where ambient noise overpowers the system's capabilities. This is not a problem. Figure 8 - The tuning screen showing a good noise level, well below the measurement curve. 21-EN