Poor high frequency EDT

[grignacarbo]

hi everyone, I'm dealing with my vocal booth which has a size of about 3x4 meters and a height of 3 meters. The room has an average rt30 around 150-200 ms, but if I look at the EDT graph (turquoise line) it seems that the high frequencies are completely absorbed, is this normal? as you can see I have a slat wall and the wall in front of the slat wall is completely reflective, moreover one of the two side walls is also reflective, the ceiling is completely absorbent, there is also a large sofa that certainly absorbs a lot. I am attaching the image

also, is EDT important for the acoustic treatment of a vocal booth?

 

[John Mulcahy]

EDT is the Early Decay Time, how fast the initial decay is. In small spaces and when close to the source it is normally very fast. It is not an RT60 measure.

 

[grignacarbo]

do you advise me to increase the high frequencies of the edt to have a good quality of the vocal recordings?

 

[John Mulcahy]

No, I advise you to ignore the EDT. Your space is too small for it to tell you anything useful.