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I'd like to take some ETC measurements tonight but I'm not sure what the correct range on the graph is that I should be using. I think it's 0-20ms (possibly 0-40ms?) for the horizontal range but I'm not sure of the general vertical db range.

Also, to make sure I have this right, the first spike in the graph is the original signal and any spike after that is a reflection I need to tame? I'm just not sure of the allowable db limit of the spike to where it's problematic.

Now, from what I've read, 1 milisecond = just about 1 foot, so if I have a reflection at 5ms, then it's the distsance from speaker to mic plus 5 feet, so I can use string to figure out where the reflectionis coming from. Am I on the right track here?
 
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