| Decay times
0.5S is a 'standard' decay time for a domestic living room. This was established some time ago by survey. There is a minimum size room necessary for RT60 to be mathematically correct, however we use the term all the time in small rooms, but don't trust them at all! Measurements, particularly RT in low octave bands, can be very flaky.
There are others, EDT and so on.
I tend to use simply the word Decay since all the specific terms are invalid due to the prominence of modes (small rooms cannot support enough low modes to have an even spread)
Very roughly I would guess 'Dead' would be in the below 200mS territory. This would tend to increase towards LF. So let's suggest 50-100mS at 4K, rising smoothly to 300mS at 100Hz would be a nice little room. Google the EBU control room specs if you want something more serious.
DD |