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I,m trying to get to grips with reading the graphs, as i understand the ETC is better for finding reflections - would anyone be able to tell what this plot reads,

What is difference between %dB vs dBFS?

the mic is 3 feet from the speaker and approx, 3 feet from ceiling and floor,
the walls are about 5 feet from from the left and 8 feet from right,
the speaker 4 feet from the rear wall.
 

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dBFS means "dB relative to full scale", % = 100*10^(dBFS/20). For example, 0dBFS = 100%, -6dBFS = 50%, -20dBFS = 10% etc. The linear % scale is more useful when looking at levels of reflections, the logarithmic dB scale is more useful to examine low level detail and decay times.

When you measure so close to the speaker (3 feet) the direct response dominates, reflections are much lower in (relative) level and less apparent.
 
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