Yamaha DSP-A1 Owner's Manual page 61

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.
Level
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).
Level
Reverberations
Level
Small
Time
Dead
Direct sound
Level
Small
60 dB
Time
REV. TIME
Reverberations
P. LIVENESS (Presence Liveness)
Adjusts the apparent reflectivity of the walls on the front presence
sound field. The larger the value, the more reflective the front
presence sound field becomes.
S. LIVENESS (Surround Liveness)
Adjusts the apparent reflectivity of the walls on the rear surround
sound field. The larger the value, the more reflective the rear
surround sound field becomes.
Level
Direct sound
Large
Time
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.
Level
Early reflections
Large
60 dB
Time
REV. TIME
Reverberations
Time
Live
60 dB
Time
REV. TIME
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