That is not something I had considered -- I will go back to the original source and verify that the data is indeed what it is supposed to be.
I appreciate the consideration and effort to look at the data!
Thank you, Greg and Walt, for your responses!
Hmm, I must be misunderstanding the fundamentals. My understanding of the equivalent continuous sound level, Leq (after re-reading some definitions) is that it's the average sound pressure level of the fluctuating noise being measured. In fact...
I have found a number of forum threads that describe the process of summing a 1/3rd octave frequency spectrum into an overall sound pressure level. For example, vanstoja's response in this old thread (and the great follow-up by GregLocock and others) describes the process as simply adding the...