Any chance that you are really bad at estimating frequency? A rough rule of thumb to remember is that sound in air travels at about 1000 feet per second and the wavelength of a 1 KHz tone is about one foot. So the wavelength at 2KHz about half a foot. Room resonance tends to occur at much lower frequencies than that.
There is another rule of thumb that helps when making such estimates. Imagine that all of the walls (including ceiling and floor if they are reflective) are mirrors, picture in your mind the resulting picture (a grid array of identical speakers, half pointing backwards), imagine setting up a real grid in an open space, then figure out what that array would sound like as the sound from each speaker either cancels or adds to the sound from the others. Read this article to see how it is done:
Standard stuff that is done all the time when setting up PA systems. The bursts aren't the best signal though; pink noise is. Do a web search on "real time analyzer" to see how it is done:
[That being said, you will get far better results by applying a solution that is acoustic rather than electronic. Here is a good place to start learning more about this:
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