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When I finish EQing my sub, ending with a 24dB/octave roll-off, how do I check that against my mains?
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Same way as you tested the sub only, except turn on the mains.
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I assume I have to run REW through my receiver, making sure the receiver is set up to only output to sub and mains. I'm not too sure how to do that
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Hopefully you checked the sub itself by running REW through the receiver with the receiver in stereo mode and crossover engaged and the mains disconnected. There is no change to that procedure when you test the sub + mains. Just re-connect the mains cables (with power off, of course).
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Also should I included the centre with the L & R? I assume so.
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Certainly not. REW produces a mono analog signal. There is no way it can support digital sound field steering. The receiver is always in stereo mode when using REW and for sub and mains only (stereo of course automatically shuts off all speakers except the mains and sub. To turn off the mains, unplug the speaker wires with the power off).
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Is there anything special I need to know to set up the graphs for full range responses?
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Turn on the mains with the sub and measure to 200Hz just as you did with the sub only except now you want to look at the crossover area to ensure it's as flat as possible and at the same level as the sub.
The diagram below shows the target for a sub and for a set of mains using a 80Hz crossover (in a perfect world). The goal is to end up with that red line occuring as a result of the sub and mains adding together.. REW is quite useful in accomplishing this. You'll need to adjust level and phase of the sub in this case.
Crossover 80 sub + mains.jpg
If you want to measure out to 20KHz full range, you would need a microphone that supported that bandwidth. The RS meter does not.
brucek