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Is there anything I can read that will help me to understand them better?
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Yes of course - I'll see if I can't hunt down any of the literature.
Btw, sound travels roughly 1 foot every millisecond - so if you see an 8ms delay in the ETC, then the reflecting surface was probably around 4 feet away (resulting in a total of 8 feet extra distance travelled, or 8ms delay). Zoom in on the ETC and you should notice a spike around 8ms. In fact, just about every spike you see should correlate to some dimension in your room. And then when you calculate the wavelengths that result in 180 degree phase shifts from the difference in distance, you should find a resulting dip in the frequency response.
http://www.peavey.com/support/techno...ncellation.cfm