User manual

C4-TOP Data Sheet C4-TOP
Example for a flown C4 array
30°
20°
30°
Ground stacks are normally constructed by placing cabinets
directly on top of each other. Having no vertical angle between
TOP cabinets produces a strong coupling effect and increases
vertical directivity which helps to provide coverage to the far field.
However it is not recommended to stack TOP cabinets more than
three high as this produces very different dispersion patterns in the
mid and high frequency range.
Flown systems
d&b offers a wide range of accessories for the assembly of flown
C4 arrays (d&b Flying Bar, d&b Flying System). Detailed
descriptions can be found in the manuals for Rigging Accessories
and the Flying System.
Compared to a ground stacked system a flown array will normally
give a smoother level distribution in the audience area and provide
coverage over a longer range.
For the horizontal set up of the array generally the same rules
apply as already described in the section C4 arrays. The vertical
set up of TOP's and SUB's is determined by the required level and
reach of the system. A standard 5° vertical angle is normally used
between adjacent rows of C4 cabinets in an array.
Placing all the C4-SUB's used on the ground in preference to flying
them may give a higher sound pressure level but at the expense of
an inferior sound balance from the whole system. So at least some
of the SUB's should be integrated into the flown array. This can be
achieved by placing them in the lower rows, where, due to the
smaller distance to the audience less TOP's are needed or by
inserting whole columns or rows of C4-SUB's. If a vertical column
of SUB's is deployed ensure that the total horizontal angle between
TOP cabinets in adjacent columns does not exceed 30°.