We have already talked about that in home theater systems, the measurement of reverberation time is actually the time it takes to decrease by 60 dB. This is not particularly psychoacoustic, and it is also very difficult to measure in place. This is due to the presence of background noise in the home theater or undesirable music courses, which often results in less than 60 dB energy decomposition before the noise decay becomes less than the residual noise in the environment.
Even in the quieter surroundings of a Victorian style in the days before the road traffic, Sabine had to make measurements, using her ears at night to prevent the results from being affected by the background noise level. Because we almost never hear a streetlight breakup, our ears and our brains have adapted very logically, to focus on what can be heard. Therefore, they are more sensitive to the effects of 20 dB at 30 dB first of street lamps drop curve of 60 dB reverberation is directly proportional to the previous curves, which should not pose any problem when measured in the custom installations Dedicated home theater.
However, if the curve of a home theater is to form a double aspect, this simple relationship is broken. The net result is that while the reverb T60 home theater time is a suitable value, due to the early disintegration of less than 30 dB, we perceive that the film is shorter than the reverberation actually is.