I actually see a good improvement to Mr. Helms results, the range from high to low dB's has been reduced across the entire spectrum. Many of the severe drops/nulls have been tamed. Not sure if you realize this is not a 1/3rd or higher octave graph like most are, this covers 1Hz increments upto 300hz. Many people miss this information from other products used.

Here is another nice article I've found.

http://www.sbrjournal.net/journalsite/archives/acoustics/Acoustics.htm

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