Yamaha DSP -A780 Operation Manual page 36

Each sound field program has a set of parameters that allow you
to change the characteristics of the acoustic environment to create
precisely the effect you want. These parameters correspond to the
many natural acoustic factors that create the sound field you
experience in an actual concert hall or other listening environment.
The size of the room, for example, affects the length of time between
the "early reflections"—that is, the first few widely spaced reflections
you hear after the direct sound. The "ROOM SIZE" parameter
provided in many of the DSP programs alters the timing between
these reflections, thus changing the shape of the "room" you hear. In
addition to room size, the shape of the room and the characteristics
of its surfaces have a significant effect on the final sound. Surfaces
that absorb sound, for example, cause the reflections and
reverberations to die out quicker, while highly reflective surfaces allow
the reflections to carry on for a longer period of time. The DSP
parameters allow you to control these and many other factors that
contribute to your personal sound field, allowing you to essentially
"redesign" the concert halls and rooms provided to create custom-
tailored listening environments that ideally match your mood and
music.
Refer to "3-2. DESCRIPTIONS OF THE DIGITAL SOUND FIELD
PARAMETERS" on page 35 for a description of what each
parameter does, how it effects the sound, and its control range.
1. With the desired program selected, press the SET MENU/
PARAMETER Select ( ) key on the remote control unit once. This
will recall the first parameter. In the case of the CONCERT HALL
program, for example, this would be the INIT. DLY parameter. You
can continue pressing the SET MENU/PARAMETER Select ( ) key
to select other parameters in sequence. If the key is pressed when
the last parameter is being displayed, the first parameter is selected
again.
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2. When the desired parameter has been recalled, use the SET
MENU/PARAMETER + (increment) and – (decrement) keys to
change its value to create the effect you want. + increases the value
of the selected parameter, and – decreases the value of the selected
parameter. In both cases you can hold the key down for continuous
incrementing or decrementing. The display will pause for a moment
at the initial value of the parameter as a reminder. (On the monitor
screen, mark at the head of parameter name disappears at the
*
initial value of the parameter.)
NOTE: Parameter edits made in this way will remain in effect even
with power cut due to power failure or the power plug disconnected
from the AC outlet for up to about two weeks, after which all
parameters, as well as other adjustments or settings on this unit, will
return to their initial values or conditions.