A simple experiment looks like this: (other audio interfaces will be similar)
Fire up the Motu Audio Setup app.see img
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Open Mac System prefs > Sound , select Motu for Input and Output
Start a new project, check project properties are surround and 48khz
Add some footage to the timeline, with or without sound is ok.
Add at least 6 fx sounds from FCPX sound library one with heavy bass effects is good for LFE test.
see img
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Select each sound and change the Surround Panner parameter to Circle
(other presets worth experimenting with, e.g. ambience etc.)
see img
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Grab the grey dot in the panner and move it, the sound will move around in your speaker system.
The panner will be coloured if it is anywhere other than in front of one speaker icon i.e. exclusively thru one of the speakers
see img
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thats it...so easy and plenty of parameters to play with