Decay times

The first three parameters are decay times as shown below

RT-60 Reverberation time (T30) and Early Decay Time (EDT) are defined in the Reverb Times section above.

The RT-60 User defined reverberation time (Txx), is the 60 dB decay time calculated by a line fit to the portion of the decay curve in an interval specified in the level limit boxes, remembering the minus signs in front. It is often used as a T15 (-5 to –20dB) or T20 (-5 to –25dB) parameter, giving a well defined decay time measure for responses with inferior decay range, or providing an indication of double sloping of the decay if it is significantly different from the T30. Double sloping occurs if one room is coupled with another room with a different reverb time. The coupling may be a large opening between the rooms.

The T30 and Txx will in the display of the results grid both be accompanied by a correlation coefficient for each octave band, as described in the Correlation section.