User Manual

Speaker System Design Guide for
Yamaha Sound System Simulator
3. Configuring Output Levels
You can use Y-S
3
to estimate the sound pressure levels at different points for different amp
types, gains, and input levels. The computed levels can be used to determine whether the
system you are designing can obtain the sound pressure levels that you want. In
computations based on direct sound, the SPL attenuates linearly as the distance from the
speakers increases, but in an actual sound field, sound diffusion results in mitigation of the
rate of SPL attenuation as distances increase.
This section provides an example of how to configure levels using Y-S
3
, and it compares the
level attenuations at different distances in computed values based on direct sound to those
in the measured values in an actual hall.
; Configuring Sound Pressure Levels with Y-S
3
¾ On the Config tab in the Speaker Property dialog box, you can configure the input
level and the amp attenuator, and consider what configuration will yield the SPL
that you want.
¾ When you first set up the speakers or when you change the speaker type, the
recommended amp is selected and the level settings are at their default values
(+4.0 dBu for the input level and -10 dB for the attenuator level
).
For these settings, the overall SPL at a point where X = 0 and Y = 11.5 would be
90.7 dB.
Figure 7: Default level settings
¾ You can use Y-S
3
to change the input and/or attenuator levels and compute the
maximum SPL for the rated power or compute the approximate SPL for a certain
nominal input level.
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