Yamaha RX-V667 Owner's Manual page 80

Liveness. Surround and surround back liveness. Adjusts the
reflectivity of the virtual walls in the hall by changing the rate at
which the early reflections decay. The early reflections of an audio
source decay much faster in a room with acoustically absorbent
wall surfaces than in one which has highly reflective surfaces. A
room with acoustically absorbent surfaces is referred to as "dead,"
while a room with highly reflective surfaces is referred to as "live."
This parameter lets you adjust the early reflection decay rate and
thus the "liveness" of the room.
0to 10
|
_I ead
Time
D_ / _
Small reflected
sound
Source sound
Time
_ive
Time
Small value = 0 Large value = 10
Reverberation time. Adjusts the amount of time taken for the
dense, subsequent reverberation sound to decay by 60 dB at 1 kHz.
This changes the apparent size of the acoustic environment over an
extremely wide range. Set a longer reverberation time to get more
sustaining reverberation sound, and set a shorter time to get
articulate sound.
1.0 to 5.0 s
Reverberation
I_1
Rev Time
Short
reverberation
X,
Audio source
Source sound Reverberation
Early reflections IIIIiI
rime _ Time
Rev. Time Rev. Time
Long 1
reverberation i | " ID
Small value = 1.0 s
Large value = 5.0 s
Reverberation delay. Adjusts the time difference between the
beginning of the direct sound and the beginning of the
reverberation sound. The larger the value, the later the
reverberation sound begins. A later reverberation sound makes you
feel as if you are in a larger acoustic environment.
0 to 250 ms
Source sound
q
(dB)
Rev. Delay
Rev Time
t
60 dB
Time
En 80