Yamaha DSP-A2 - Manual (Page 58)

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Descriptions of the digital sound field parameters
Not all of the following parameters are found in every program.
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ROOM SIZE
How it Affects the Sound:
Changes the apparent size of the music venue. The larger
the value, the larger the simulated room will sound.
What it Does:
Adjusts the timing between the early reflections. Early
reflections are the first group of reflections you hear before
the subsequent, dense reverberation begins.
Control Range:
0.1 – 2.0
Standard setting is 1.0.
Changing this parameter from 1 to 2 increases the apparent
volume of the room eight times (length, width, and height all
doubled).
P. ROOM SIZE (Presence Room Size)
Adjusts the apparent space size of the front presence sound
field. The larger the value, the longer the interval between
reflections becomes, which increases the depth of the sound
source.
S. ROOM SIZE (Surround Room Size)
Adjusts the apparent space size of the rear surround sound field.
The larger the value, the larger the surround sound field
becomes.
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INIT. DLY (Initial Delay)
How it Affects the Sound:
Changes the apparent distance from the source sound.
Since the distance between a sound source and a reflective
surface determines the delay between the direct sound and
the first reflection, this parameter changes the location of the
sound source within the acoustic environment.
What it Does:
Adjusts the delay between the direct sound and the first
reflection heard by the listener.
Control Range:
1 – 99 milliseconds
For a small living room this parameter would be set for a small
value. Large values for a big room. Larger values produce an
echo effect.
P. INIT. DLY (Presence Initial Delay)
Adjusts the delay between the direct sound and the first reflection
on the presence side of the sound field. The larger the value, the
later the first reflection begins.
Control Range:
1 – 99 milliseconds
S. INIT. DLY (Surround Initial Delay)
Adjusts the delay between the direct sound and the first reflection
on the rear surround side of the sound field. The larger the value,
the later the first reflection begins.
Control Range:
1 – 49 milliseconds
INIT. DLY INIT. DLY INIT. DLY
Level
Direct sound
Early reflections
Time
Small space
Small
Level
Direct sound
Early reflections
Time
Large
Level
Direct sound
Early reflections
Time
Large space
Level
Time
Small
Level Level
Time Time
Large
Direct sound
Early reflections
ADVANCED FEATURES