Apple Logic Pro X User Manual
Page 741
Chapter 22
Surround in Logic Pro X
741
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LFE Level slider: Drag the LFE Level slider or field to control the volume of the LFE output.
The abbreviation stands for Low Frequency Enhancement or Low Frequency Effects, as the LFE
output is most commonly sent to a subwoofer channel. The use of a subwoofer speaker is
not mandatory.
Tip: If you want only low frequency signals to reach the output, insert a multi-mono surround
EQ into the surround master channel strip. Use this to set the LFE (or subwoofer) output. A
cutoff frequency of 120 Hz is standard for most surround applications. For more information,
see
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Separation Controls: Drag the sliders in the lower section of the Surround Panner window to
determine the amount of separation between channels. As you change these parameters
away from values of 1.00, the separation square changes (to a trapezoid or rectangle) in the
surround field, providing visual feedback on how the channel is being affected.
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Separation XF: Applies to the Left and Right (front) channels. Reducing Separation from 1.00
down to 0.00 mixes the right signal into the left channel, and vice versa, until both channels
output a mono signal.
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Separation XR: Applies to the Left and Right Surround (rear) channels. Works as above, for the
surround speakers.
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Separation Y: Affects the mix relationship of the front and rear channels (in front or behind
the listening position, in other words). It mixes the Left/Left Surround and Right/Right
Surround channels. When Separation Y is set to 0.00, the front and rear channels output
in mono.
The separation square is visible if the extended parameter section is open. If the extended
parameter section is closed, it remains visible if any of the separation values do not equal 1.00.
It also stays visible when the default values are reached by editing the square graphically.
Closing the extended parameter section (with all separation values at 100%) makes the square
disappear. You can Option-click the value field or sliders shown in the extended parameters (or
on the separation square lines) to reset them to default values.
Note: In 7.1 ITU surround formats, the Separation of Left Middle and Right Middle is
determined by the average separation value of the Front and Rear channels.
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Level Compensation pop-up menu: Select the surround pan law for stereo to surround and
mono to surround channels.
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Unity gain at speaker: The default setting for mono to surround and stereo to surround
channels. All new projects and projects imported from Logic Pro 9.1.7 follow this pan law.
A mono signal panned hard left of a stereo output with X dB gain will do the same if panned
hard left with a mono to surround panner. A stereo signal panned hard left and right with X
dB gain will do the same if panned hard left and right with a stereo to surround panner.
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Unity gain at mid-point: This was the default setting used for Logic Pro versions 9.1.4 to 9.1.6.
Projects imported from these Logic Pro versions will adopt the Legacy pan law. You can
choose a different pan law from a dialog or this pop-up menu.
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Legacy (Pre Logic 9.1.4): This was the default setting used for Logic Pro versions 8.x to 9.1.3.
Projects imported from these Logic Pro versions will adopt the Legacy pan law. You can
choose a different pan law from a dialog or this pop-up menu.