User Manual

Speaker System Design Guide for
Yamaha Sound System Simulator
Introduction
Y-S
3
is a speaker system design software application. It is especially useful in
determining speaker placement. The user can easily enter the desired venue
shape and calculate the three-dimensional coverage area for given speaker
placements and angles.
Furthermore, Y-S
3
can provide valuable information about many of the points that
must be considered when designing a speaker system by (1) calculating sound
pressure distribution while taking into account speaker interference, (2) calculating
the responses at specific points, and (3) calculating floor SPLs (sound pressure
levels) caused by changing the system gain.
This guide explains how the Y-S
3
computations can be used in the actual system
design process by using examples of speaker target configurations, response
evaluations for specific points, and output level configurations. Y-S
3
is based
around the concept of inputting simple room geometry information to determine the
appropriate speaker configuration, so it only computes the effects of direct sound.
However, actual sound fields are affected by reflected sound waves from walls,
floors, and ceilings. Therefore, it is advantageous to understand at the
system-design stage how the results of direct sound computation will correspond to
the response of the actual sound field. This guide includes actual measurements to
show how computed results correspond to actual sound field responses.
The examples in this guide use a 600-seat multi-purpose hall with a trapezoidal
floor plane. The width of the hall is 22 m, the depth is 24 m (from the front of the
stage to the wall behind the seats), the height of the ceiling is 14 m (the maximum
ceiling height above the seats), and the reverberation time is 1.2 seconds (for a
500-Hz octave band sound with empty seats and the curtains down).
Conditions of the Venue
 Hall: 600-seat, multi-purpose hall
 Speaker type: One speaker array composed of two IF2112/64 speakers
 Speaker location: In the front at a height of 8 m (7.2 m above the stage floor)
2