Stereo Spread in Logic Pro for iPad
Stereo Spread is generally used as an output channel strip mastering effect, but can be used in any channel. There are several ways to extend the stereo base (or the perception of space), including using reverbs or other effects and altering the signal phase. These options can sound good, but they can also weaken the overall sound of your mix by ruining transient responses, for example.
Stereo Spread extends the stereo base by distributing a selectable number of frequency bands from the middle frequency range to the left and right channels. This is done alternately—middle frequencies to the left channel, middle frequencies to the right channel, and so on. This greatly increases the perception of stereo width without making the sound totally unnatural, especially when it is used on mono recordings.
To add Stereo Spread to your project, choose Imaging > Stereo Spread in a channel strip Audio Effect plug-in menu or Plug-ins area. See Intro to plug-ins. Also see Add, replace, reorder, and remove plug-ins in the Plug-ins area and Work with plug-ins in the Mixer.
![Figure. Stereo Spread window.](https://help.apple.com/assets/666A34BC79C468390202D0B9/666A34C7A16BCE32A1063641/en_US/0c09c77c3dc13b85306e2dd871206e10.png)
Stereo Spread parameters
Order knob and field: Determine the number of frequency bands that the signal is divided into. A value of 8 is usually sufficient for most tasks, but you can use up to 12 bands.
Lower Intensity knob and field: Set the amount of stereo base extension for the lower frequency bands.
Lower Frequency slider and field: Determine the lowest frequency that is redistributed in the stereo image.
Upper Freq slider and field: Determine the highest frequency that is redistributed in the stereo image.
Upper Intensity knob and field: Set the amount of stereo base extension for the upper frequency bands.
Note: When setting the Lower and Upper Intensity knob values, be aware that the stereo effect is most apparent in the middle and higher frequencies. Distributing low frequencies between the left and right speakers can significantly alter the energy of the overall mix. Use low values for the Lower Intensity parameter and avoid setting the Lower Frequency slider below 300 Hz.
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