Tommy,
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Can I ask why you measured 1 channel at a time?
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Well, when you do a frequency sweep with REW, it outputs the same sound to all channels at the same time. So in order to see how each channel (Speaker) performs in your room you can only have the one speaker active at any one time. Otherwise the microphone is going to pick up the sounds from both speaks (for a two speaker setup). It will still produce a graph, but the results will not be as meaningful.
Does that make sense?
If you look at the graphs I have produced (Sorry REW has produced), you can see each speaker has a different response depending on its position in the room and any other reflections, absorptions that happen to the sound from leaving the speaker and arriving at the mic.
Mike