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Just to clarify, I would assume that means that I'd need to get splitters to split both Line In and Line Out 1/8" plugs
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I don't really understand. To run REW you always required splitters at the line-in and line-out plugs on the soundcard, so as to break out the left and right channels. One of those channels was always left unused in the past.
You now have the option to not use a soundcard calibration file, by connecting that unused left channel of the line-in and line-out with a cable.
Like this:
The left channel takes care of the soundcard calibration. It also is a time reference to compare the timing difference between the two channels, so that time can be translated into distance. When you run a measure sweep of any single speaker (not a sub) it will tell you how far away the microphone is from the speaker. This is the same distance information you require for distance to enter into your receiver.
I also tested this feature by looping the right channel through a BFD to determine its delay that we always assume is 1 foot of distance. Well, it's 1 foot of distance...
brucek