Yamaha DSP -A780 - Manual (Page 38)

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● REV. TIME (Reverberation Time)
How it Affects the Sound:
The natural reverberation time of a room depends primarily on its
size and the characteristics of its inner surfaces. This parameter,
therefore, changes the apparent size of the acoustic environment
over an extremely wide range.
What it Does:
Adjusts the amount of time it takes for the level of the dense,
subsequent reverberation sound to decay by 60 dB (@ 1 kHz).
Control Range:
1.0 – 5.0 seconds.
The reverb time in a small-to-medium size hall would be between
1 and 2, and in a large hall it is normally between 2 and 3.
● EFCT TRIM (Effect Trim)
Performs fine adjustment of the level of all the effect sounds.
Control Range:
–3 dB to 3 dB
● DELAY
Adjusts the delay between the direct sounds (at the main left,
center and main right channels) and the effect sounds (at the front
effect and rear effect channels). The larger the value, the later the
effect sounds are generated.
Control Range:
15 – 30 milliseconds
REV. TIME
60 dB
REV. TIME
60 dB
REV. TIME
60 dB
Level
Reverberations Reverberations Reverberations
Time
Small
Level Level
Time Time
Large
Direct sound
Early reflections