HK Audio CDR 210 F - Manual (Page 60)

Manual
COHEDRA
® & COHEDRA ® Compact
6 Creating a Rigging Plan
Go to the Rigging panel to view the COHEDRA ®
array's rigging plan. Select the menu option
Create Print Version from the File menu. A window
appears. Enter into this window the folder and
name of the RTF file in which you want to store
the rigging plan and click the Save button. CAPS
generates an RTF file with the rigging plan and
opens it using your computer's designated word
processing program for RTF files.
If necessary, edit data in the given word processing
program to create a layout suitable for the pages
you want to print. Then you can print the rigging
plan using the word processing program's standard
printing function.
7 Creating Horizontal
Subwoofer Arrays
Subwoofers may be set up in vertical or horizontal
arrays. Vertical subwoofer arrays are beneficial in
that – depending on the length of the array – they
focus sound energy quite tightly on the vertical
plane. This yields greater throw distances without
exciting the venue's ceiling. Their drawback is that
vertical subwoofer arrays positioned at the right and
left of stage generate interference on the horizontal
plane. A horizontal subwoofer configuration arrayed
across the full width of the venue's grounds does
not generate interference. Bear in mind that the
distance between two neighboring subwoofers in
the array must be less than half the wavelength of
the highest frequency radiated by the subwoofer
array.
A horizontal subwoofer array focuses sound energy
quite tightly on the horizontal plane. This means
that in the near field, it radiates a horizontal
cylindrical wave with a dispersion angle of nearly 0°.
And that, in turn, means that sound energy does
not reach listeners located in front of the subwoofer
array but outside the horizontal cylindrical
wave's sound field. For this reason, it is usually
necessary to adapt the horizontal subwoofer array's
horizontal angle of radiation to suit the given
sound reinforcement situation. This is achieved by
positioning the subwoofers accordingly or adjusting
an appropriate delay setting for every subwoofer
(block).
Go to the Sub Array panel to create a horizontal
subwoofer array. A subwoofer block can comprise
an individual subwoofer or a vertically arrayed block
of subwoofers. Type into the boxes at the right of
Distance from center the individual subwoofer
blocks' distances measured from the system's
center line of symmetry.
Note:
In order to prevent horizontal interference, the
distance between two neighboring subwoofer blocks
may not be greater than half the wavelength of the
subwoofer array's upper limiting frequency.
Example:
Upper limiting frequency 100 Hz: Lamda half of
100 Hz = 170 cm
Enter into the Opening Angle box the subwoofer
array's desired horizontal angle of radiation.
The screen shows a top view of the real subwoofer
blocks (black) and the virtual subwoofer blocks'
(blue) setups as required to implement the selected
angle of radiation. In the boxes to the right of
Virtual Distance you'll see indicated the distances
between the respective real subwoofer block and
its virtual counterpart. In the boxes to the right of
Delay you'll see indicated for each subwoofer block
the delay time required to implement the virtual
array in the real world. Enter these delay times to
the DFC's Low Delays for the respective subwoofer
blocks.