If you have any dimension that is the same or a multiple/dividend of any other, you will have low frequency issues. If the room is brick/block/cement, these issues will be multiplied.
Auralex panels are fine if you are not treating low frequencies. But if it is a control room, you must treat the low frequencies. They have corner traps, but I would recommend TWO of those foam traps for the corners. Turn them as shown in the drawing attached and place them floor to ceiling.
But first change the dimensions from 6 X 3 X 3 (LWH) to something like: Length = 641cm, by Width = 443cm, Height = 277cm. This will work fine, especially for a concrete room. Note that none of the dimensions can be divided by the other... (they are prime anyway)
Now, I know that the ideal is not possible in many situations but it is very important to make the dimensions work as well as possible for the LF spread as this foundational planning/process will affect everything that you will do after.