Wayne Parham Messages: 19064 Registered: January 2001
Illuminati (33rd Degree)
That was a gated (fast) log sine sweep, often called a "chirp" signal.
My main focus was the crossover region, because I was looking for nulls. You can see them on the computer screen in the foreground when I move the microphone above and below the speaker. Watch for the notches to grow as I get close to the location of the vertical nulls, and shrink back when I get past them.
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