And just for the sake of being thorough, that answer is paraphrased here:
On the REW Preferences page. select Output to go to HDMI 1 and Timing Reference Output to go to HDMI 2. Now you have the REW sweep output going to two channels, your L & R mains, at the same time.
BEWARE: Doing this is only meaningful at low frequencies, 200 Hz and below, where you might want to see how the sub or subs and the low-frequency response regions of your L & R Mains all work together in your room. Above that, L + sub or R + sub plots should be taken separately.
Is there any benefit to running a full system (all speakers + sub) full range sweep?
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