RT60= 1.5 s to 2.5 s: A good compromise if the room is to be used for both speaking and music. RT60 = 3.5 s: Better for music, but some loss of articulation. Would likely be difficult to understand speech.
What is a good RT60 for a control room?
So what is a good RT60 for a control room or a recording room? Well, there isn't just one answer for the latter (drums tend to sound good in large rooms) but for your control room, about 0,3 seconds seems to be agreed upon as a good number.
What is a good reverberation time?
What is a desirable reverberation time? The optimum reverberation time for an auditorium or room of course depends upon its intended use. Around 2 seconds is desirable for a medium-sized, general purpose auditorium that is to be used for both speech and music. A classroom should be much shorter, less than a second.
What is an RT60 test?
RT60 is a measure of how long sound takes to decay by 60 dB in a space that has a diffuse soundfield, meaning a room large enough that reflections from the source reach the mic from all directions at the same level.