HK Audio CDR 210 F - Manual (Page 59)

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However, a bandwidth of three octaves comes
closer to the reality of a sound reinforcement
system's broadband response. In the high frequency
range above 4,000 Hz, select a bandwidth of
three octaves because at these high frequencies,
simulated results using narrow bandwidths differ
markedly from actual results in the real world.
Click A-Weighted to activate/deactivate the A
evaluation option for the simulation.
5.6 Viewing the
Dispersion Pattern
To view the COHEDRA ® array's dispersion pattern
at continuous or peak levels, select Continuous
or Peak on the Setup panel at the top center of
your screen. Activate the A evaluation for the
sound level by clicking A-Weighted. Then click the
Calculate button. A window showing the progress
of the calculation operation appears while CAPS
computes. Then the COHEDRA
® array's dispersion
pattern is shown in a color side view. At the lower
edge of the side view, you'll see a legend indicating
the assignments of colors to sound level values.
Click Show Aiming Lines to also view the aiming
lines running from the individual enclosures to the
audience areas.
To view the COHEDRA ® array's dispersion pattern
in a specific frequency band, select Detailed at the
top center of the screen, and the desired bandwidth
and its center frequency in the two selection boxes
on the right.
Note:
You can use a bandwidth of a third of an octave or
one octave to view narrow-band spatial interference.
However, a bandwidth of three octaves comes closer
to the reality of a sound reinforcement system's
broadband response. In the high frequency range
above 4,000 Hz, set a bandwidth of three octaves
because at these high frequencies, simulated results
using narrow bandwidths differ markedly from
actual results in the real world.
Click A-Weighted to deactivate the A evaluation
option for the sound level simulation. Then click the
Calculate Band button to compute the dispersion
pattern of the array in the selected frequency band
or click Calculate All to compute the dispersion
pattern in all frequency bands. A window showing
the progress of the calculation operation appears
while CAPS computes. Then the COHEDRA
® array's
dispersion pattern is shown in a color side view. At
the lower edge of the side view, you'll see a legend
indicating the assignments of colors to sound level
values. Click Show Aiming Lines to also view the
aiming lines running from the individual enclosures
to the audience areas.
If you clicked Calculate Band to compute the array's
dispersion pattern in the selected frequency band
only and then select another frequency band,
CAPS calculates and indicates the new band's
dispersion pattern. On the other hand, if you clicked
Calculate All to compute the dispersion pattern
of all frequency bands and then select another
frequency band, CAPS indicates the new frequency's
dispersion pattern without having to calculate it
first.
Note:
If you have not locked the configuration to prevent
further editing, CAPS does this automatically when
computing the dispersion pattern. The lock on the
given button closes and the button is engaged.
To unlock the configuration, simply click the button
again so that the lock opens and the button is
disengaged.
5.7 Viewing Delay Times
Between Mid/High Arrays and
Stacked Subwoofers
Click Yes in the Include Bass Box field at the upper
right of the Setup panel. A subwoofer appears in the
side view; it can also represent several subwoofers
for multi unit configurations. At the right of Include
Bass Box, type the x coordinates into the X box and
type into the Y box the stacked subwoofer's height
measured from the reference point. The side view
of the subwoofer shifts accordingly. Then activate
Show Alignment Delay. The side view indicates
the delay between the mid/high array and the
subwoofer at the points where the individual
enclosures' aiming lines meet an audience area.
Negative values mean that subwoofer signals arrive
earlier; positive values mean that the mid/high
array's signals get there first.
In some cases, the difference in delays must be
compensated via a delay function (Low Delay or
Mid+High delay on the DFC Software Controller)
to ensure mid/high and subwoofer signals arrive
simultaneously at the first rows of the front
audience area. Do not compensate for delay in
projects with inclining audience areas because the
subwoofer signal will arrive much later than the
mid/high signal at the top rows of the inclining
audience area.
The improvement at the front rows comes at the
cost of signal degradation at the top rows. In these
cases, it is preferable to fly the bass bins.
COHEDRA
®
Setups with CAPS