Beam Angle
aims the vertical beam up
or down. Try it out by selecting
Beam
Angle [*]
, changing the number and
observing its effect. Note that after enter-
ing a new number you will need to press
Enter
to initiate the change. You will also
need to do a new
Calculate Mapping
to
view the change. The old map will have
been wiped out by the program as you
made the change.
Note that you can also check
Focal Point
[ft]
and then enter the exact location of
the beam’s focal point in
Height from
Floor
and
Distance from Front
. Another
way to position the beam’s focal point is
to use the mouse cursor to grab the end
point of the aiming axis and move it to
the desired location. Try it out. It’s easy
to do. The SPL levels in the graphs will
change as the setup parameters
change.
Note that at any point you can click on the
Calculate
Mapping
bar to tell the program to map the array’s perform-
ance on the audience area.
As soon as you press Calculate Mapping, a pop up screen
will ask you to choose the resolution of the simulation. Low
Resolution simulations are much faster to run than High
Resolution ones. All you need to do to start the simulation is
to make your resolution choice by pressing one of the bars.
You also have the opportunity to choose the simulations
Bandwidth, its Center Frequency and its Weighting. The
Frequency
section lets you select center frequencies from
100 to 10,000 Hz. The default selections for the
Bandwidt
h
section allows you to run the simulation over 1 octave or 3
octave bands or Broadband.
You can change this by going to the Options window (F9),
selecting the Appearance tab and checking
Show 1/3rd
Octave.
This adds a 1/3 octave selection to the drop down
Bandwidth menu and the opportunity to set a specific band-
width for the mapping simulation. In the graphic shown, for
example, selecting “to 3150 Hz” would run the simulation
over the frequency range of 1000 too 3150 Hz.
We’ll choose the default settings for this exercise, but you
may want to try out all the different settings to become famil-
iar with them and the performance of steerable arrays.
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Users Manual
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