EDT time vs. T30

solarbell

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I am new to REW and am measuring a large room for the first time. I am not looking at room EQ right now, but specifically at reverberation and clarity. I made the measurements with a Behringer ECM8000 through a Focusrite Clarett 2Pre USB interface. The microphone was placed around 6' off the floor on a mic stand, measured in 5 different places around the room.

I noticed a few things that didn't entirely make sense, hopefully someone can help me clarify. I attached the RT60 output from one of the positions.

In the RT60 tab, the T60M checkbox is greyed out. Why is that?

For the most part, the EDT time is longer than T20 or T30. I would expect it to typically be shorter. I realize it's not a simple answer, but is that normal?
 

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