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MBOX® USER MANUAL
Note: The arrangement of connected display devices is not important for the Mbox application when it enters Fullscreen
mode. However, it may be helpful to arrange display devices to provide a useful working environment when the Mbox
application is in Window mode.
Assuming the desired format (resolution and frequency) are available for selection on the Displays pref pane, the next
step is to actually select that format. If the desired resolution and/or frequency are not available, then it may be that the
connected display does not support the desired format. In which case, the display should be replaced with one that
does support the desired format. In some cases it may be necessary to use a device between the Mbox server and
a display to “spoof” EDID. Spoong EDID allows the computer to output formats that may not be supported by the
display. In some cases this can be critical to getting the desired output format, but in other cases it may result in a lack
of picture on the display device.
Note: Devices like the Mbox Dual IO Module and the Gefen DVI Detective may be used to spoof EDID.
The Mbox application is able to read the current resolution and frequency of all connected displays, as this information is
provided by the OS. When Mbox goes into Fullscreen mode it will only use the resolution and frequency that the display
is currently set to.
Older versions of the Mbox application attempted to change the resolution and frequency of outputs when entering
Fullscreen mode. At times this could lead to confusing situations where the desired resolution or frequency were not
applied, or where the display device could not display a picture based on the received format.
To eliminate these issues, Mbox v4 will not attempt to change the display into another format when going into Fullscreen
mode. The resolution and frequency of a display, must be pre-set in the System Preferences > Displays preference
pane before entering Fullscreen mode. When a display’s format has been changed on the Displays pref pane, that new
format will update automatically in the display assignment menu for outputs in the Mbox application.
In this manner it is possible to ensure that the selected output format is supported before ever launching the Mbox
application and also guarantees that nothing that the Mbox application does ever changes the format that has been
selected.
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