HK Audio CDR 210 F - Manual (Page 57)

57
E
5.3 Aligning COHEDRA ® Array
Enclosures Manually
At the left edge of the screen, you'll see listed
individual enclosure's data. The list is numbered
in descending order from the flight frame down.
In the selection box to the right of each enclosure
number, you can determine if you want to employ
a CDR 208 S or a CDR 208 T at this position in the
array. Ensure flown CDR 210 F Sub bass bins are
always positioned above mid/high units. On the
right are selection boxes that let you determine the
vertical angle between two neighboring enclosures.
The setting options for this angle depend on the
type of neighboring enclosures:
Upper Lower Possible
enclosure enclosure angles
CDR 208 S CDR 208 S 0°
CDR 208 S CDR 208 T 0°, 1.5°, 3°, 4.5°
CDR 208 T CDR 208 S 0°, 1.5°, 3°, 4.5°
CDR 208 T CDR 208 T 4.5°, 6°, 7.5°, 9°
CDR 210 F Sub CDR 208 S 0°, 1.5°
CDR 210 F Sub CDR 208 T 3°, 4.5°, 6°
In the side view, click the audience area in which
you want to begin aligning the COHEDRA
®
array's enclosures. As a rule, you'll start with the
uppermost or rearmost audience area. A view of the
sound level envelope in this audience area appears
in the diagram at the bottom of the screen.
Now align the enclosures you have selected to cover
this audience area by adjusting the vertical angles
between the individual enclosures.
Use the aiming lines running from each enclosure
to the audience as alignment tools. An accurately
aligned COHEDRA
® array achieves very uniform
sound dispersion within an audience area, with
very little level drop-off between the first and last
audience row.
To this end, the density of aiming lines running
to the audience area should increase as distance
increases. Accordingly, the greater the altitude
of two neighboring enclosures in the array, the
smaller the angle between the two should become.
However, do not aim for totally uniform sound
dispersion between the first and last rows because
audiences expect levels to drop-off somewhat
at greater distances from the stage. Follow the
same procedures to align the enclosures of the
COHEDRA
® array to the other audience areas.
When aligning the array, you may find that you need
more enclosures to attain the desired sound level
within an audience area. If possible, increase the
number of enclosures to cover this audience area.
If not, your only remaining option is to align
enclosures so that they achieve the best possible
rather than ideal results.
Once you have aligned enclosures, click the button
with the open lock icon to ensure the configured
COHEDRA
® array cannot be changed. The lock on
the button closes, and the COHEDRA ® array can
no longer be edited. To unlock the configuration,
simply click the button again so that the lock opens.
5.4 Aligning Enclosures Using
the Optimization Function
The higher the frequency, the more pronounced
the directivity of a COHEDRA
® array. Therefore,
your best bet is to select a frequency of 5,000 hertz
with a bandwidth of three octaves before executing
the optimization function. Then click the audience
area for which you want to optimize the enclosure
alignment. Click the Draw Fit Line button. Draw a
line representing the desired sound level envelope
in the diagram at the lower edge of the screen. To
do this, place the mouse pointer at the desired
starting point. Press and hold the left mouse
button. Drag the mouse pointer to the desired end
point and release the left mouse button.
Click the Optimize button to open a window for
the optimization function. In the Optimization
Settings box you can select various settings for
the optimization function. When Area Speakers
only is activated, CAPS optimizes the alignment
of enclosures that you have manually aimed at the
given audience areas. Otherwise, CAPS optimizes
the alignment of all enclosures in the array in order
to achieve the desired dispersion in the given
audience area. This setting is not a viable option
if you have finished aligning enclosures to an
audience area and want to align other enclosures of
the COHEDRA
® array to a second audience area.
When Neighboring angles only is selected, CAPS
uses for optimization purposes only the next higher
and next lower angles alongside your manually
selected angle between two enclosures. For
example, the manually determined angle between
two CDR 208 T enclosures is 6°. In this case, the
optimization function will only allow for angles
of 4.5 ° and 7.5°! Otherwise, CAPS optimizes the
alignment using all possible angles between two
neighboring enclosures. If you have achieved a
good result by aligning enclosures manually, and
you just want to fine-tune it using the optimization
function, ensure this option is enabled. If you want
the optimization function
to align enclosures for you, deactivate Neighboring
angles only.
In the Number of Points box, enter the number of
points in the audience area at which the sound level
COHEDRA
®
Setups with CAPS
Fig. 13: Configuring flown subwoofers
Fig. 15: Example of down-tilt simulation for a ground stack
Fig. 14: Example ground stack