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3-9
Several tools varying in levels of complexity can assist the sound system designer in producing a
system of acceptable intelligibility. These range from simple layout guides for speaker placement
to complex computer modeling tools which can accurately simulate and predict sound system
performance in complex spaces. These tools also have the ability to listen to simulations of
system performances at any location within the space.
The tools selected should be based on the complexity and characteristics of the particular
installation. In many cases, layout guides and “rules of thumb” are adequate to produce an
effective design. In other cases, sophisticated modeling and analysis is necessary.
There are a number of computer modeling and simulation tools available to the sound system
designer that provides reliable predictions of speech intelligibility and audio coverage throughout
the modeled space. These tools can help the designer through difficult situations or in designing
emergency voice/alarm communications system for spaces with complex audio environments.
The best known and widely used of these modeling programs is “EASE” from Renkus-Heinz
®
.
Another program is “Modeler” available from Bose
®
Corporation. Both of these programs have
shown good correlation between predicted results and actual measurements when the system is
modeled accurately. These programs provide a reliable means to confidently design and build
more complicated systems that require minimum speech intelligibility levels.
The two listed programs require significant training and expertise to use, as well as a fair amount
of time to build models that are complete enough to provide accurate results. For small to medium
sized projects, it usually is not cost effective to use these modeling tools. However, for larger or
more complex projects, the costs of modeling tools are easily justified. It is much less expensive
to use the modeling tools to design the system properly the first time than to have to troubleshoot
problems after installation.
For the smaller projects typical in a fire alarm layout, Tyco Safety Products has developed
software called “iTool” that can be used to design a speaker system that meet requirements for
most areas. This tool is not an acoustical modeling package. It is designed to assist the Speaker
System Designer with calculations of reverberation and assist with speaker placement.
Note: See Chapter 6 of this manual for design examples that use the iTool. Refer to the iTool
Installation and User’s Guide (579-772) for more information.
Tools for Predicting Intelligibility
Introduction
Acoustical Modeling
Software