Yamaha DSP-A990 - Manual (Page 45)

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● LIVENESS
How it Affects the Sound:
This parameter changes the apparent reflectivity of the walls in
the hall.
The early reflections from a sound source will lose intensity
(decay) much faster in a room with acoustically absorbent wall
surfaces than in one which has mostly reflective surfaces. A room
with highly reflective surfaces in which the early reflections decay
slowly is termed “live”, while a room with absorbent characteristics in
which the reflections decay rapidly is termed “dead”. The LIVENESS
parameter lets you adjust the early reflection decay rate, and thus the
“liveness” of the room.
What it Does:
Changes the rate at which the early reflections decay.
Control Range:
0 – 10.
● 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.
REV. TIME
60 dB
REV. TIME
60 dB
REV. TIME
60 dB
Time Time Time Time
Reverberations Reverberations Reverberations
Time Time
Large
Large Small Small
Level
Level Level Level Level Level
Direct sound Direct sound
Early reflections