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Dialog box referencePreferences dialog ► Project - Surround (Advanced)

Figure 3679. The Surround section.
The Surround section lets you specify the surround format, speaker assignments, bass management and downmixing settings.
The Surround section contains the following settings:
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5.1 (SMPTE/ITU) should be the default template.
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Center Level. Center channel content is distributed equally into left and right channels of a 2-channel downmix with one of a choice of three levels. Each level is how much of center is mixed into both left and right. The alternatives are:
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-3 dB. This is the right amount to distribute into two acoustic sources to reach the same sound power level, thus keeping the far-field level (in the reverberant listening field, as is typical at home) equal. This is the amount by which a standard sin-cos panner redistributes a center panned image into left and right, for instance.
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-4.5 dB. Since -3 dB and -6 dB represent the extreme limits (of power addition on the one hand, or of phase-dependent vector addition on the other), an intermediate, compromise value was seen as valuable, since the correct answer has to be -4.5 dB +/- 1.5 dB.
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-6 dB. This covers the case where listening is dominated by direct sound. Thus, the two source signals add up by 6 dB rather than by 3 dB, because they add as vectors, as voltages do, rather than as power does.
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Surround Level. Surround Downmix Level is the amount of Left Surround to mix into Left, and Right Surround to Right, when mixing down from any surround-equipped format to 2 channel. The available options are:
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-3 dB. The amount by which mono surround information, from many movie mixes before discrete 5.1 was available, mixes down to maintain the same level as the original.
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-6 dB. An amount that makes the mixdown of surround content not so prominent, based on the fact that most surround content is not as important as a lot of front content. This helps to avoid competition with dialog box, for instance, by heavy surround tracks in a mixdown situation.
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-INF. Necessary for cases where the surround levels are so high that they compete with the front channels too much in mixdown situations.
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LFE Level. Choose -INF or -12 dB.
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