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I'm wondering if I can use REQ to time align my Center and surrounds with the mains, and, to confirm time alignment between my subs and L/R mains? I figured I could take a measurement of each speaker, individually, and use the time differentials measured to compute effective distance differentials.
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Yeah, you can use the All-Energy-Time graph to determine speaker distance, but it's a bit tricky I find.
You can't use absolute time since the graph uses relative time from 0ms. So you need to have all the speakers on at the same time, or at least reference each one to the sub in seperate measures.. So you could align the mains to the sub and then the center to the sub and so on.
You only need to look at the first 15ms or so since the sound travels at about a msec per foot.
To identify the peaks as to which speaker it is (and it is hard to see, given reflections etc) you can adjust the time distance on your receiver and see which peak moves. The sub peak is fairly wide and the mains will be narrower.
Anyway, it works, as I've done it, but it takes some getting use to....
brucek