User Manual

Speaker System Design Guide for
Yamaha Sound System Simulator
¾ Viewing the coverage area
The next step is to check whether the coverage area of the speakers is appropriate.
In Y-S
3
, the user can click to switch into Array Mode and view a contour
diagram for the entire array. The figure below shows the results for a splay angle of
50.0. Looking at this contour diagram, it is clear that the current array configuration
covers the important central area of the seats, but in the 1 kHz contours (an area of
midrange critical for good speech intelligibility), areas of phase interference
between speakers are also evident.
Checking the coverage area
(left: 250 Hz, center: 1 kHz, right: 4 kHz, all 1/1 OCT Band)
; Checking sound pressure distribution
¾ Sound pressure distribution differences between frequency bands
The next step is to check the effects of phase interference between speakers. In
Y-S
3
, the user can click to switch into SPL mode and view a color map of the
sound pressure distribution.
In the 250 Hz band, areas of phase interference do not appear. This is because the
wavelengths contained within the band are long compared with the distance
between the speakers.
In the 1 kHz band, areas of phase interference do appear between the speakers.
Whether or not these areas of phase interference are tolerable depends on the
purpose of the system being designed, but because the volume differences in the
central area of the room are within approximately 10 dB, one could conclude that
the level of phase interference is tolerable.
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