Specifications

TI 323 (6.0E)
23 - 36
Digital equalizer
C4-TOP/SUB-CO
C3-CO
Array EQ
System EQ
C3-CO
C4-TOP/SUB-CO
0.3 ms
Delay
Input signal
C3 wiring with C4-TOP and C4-SUB
Digital equalizer
C4-TOP/SUB-CO
C3-CO
Array EQ
System EQ
C3-CO
C4-TOP/SUB-CO
B2-CO
C4-OUT
0.3 ms
Delay
Input signal
C3 wiring with C4-TOP, C4-SUB and B2-SUB
Input signal
C3-CO
C3-CO
C4-SUB-CO
C4-SUB-CO
Digital equalizer
System EQ
Array EQ
Bass EQ
C3 wiring with C4-SUB
The configuration of any array should be thoroughly
adapted to the actual venue room acoustics and
requirements. In order to keep diffuse sound low, the
total coverage angle should only be as wide as
necessary to cover the audience area.
6.2.4. Operation with C4-SUB and B2-SUB
To extend the C3 frequency response C4-SUBs should
be used. Forming columns of SUB cabinets improves
efficiency and vertical directivity at low frequencies.
For a balanced sound at high levels a ratio of at least
one C4-SUB per C3 or C4-TOP cabinet is required.
For a further extension of bandwidth and headroom
ground stacked B2 subwoofers are used (INFRA
mode).
6.2.5. Time alignment and signal
distribution
When combining C3s and C4-TOPs the correct time
alignment of both systems is of great importance. To
achieve this C3 and C4-TOPs have to be driven with
separate signals. With a delay of 0.3 ms in the C4
signal path both systems are perfectly coherent over
the whole audio band. To avoid the influence of
different latencies (inherent delays) of the signal
chains, make sure that the C3s and C4s in one array
are driven with the same signal processing devices
using different outputs.
Normally C4-SUBs will be driven from the same signal
processor output as the C4-TOPs, or if B2-SUBs are
used, from the C4-OUT of the B2 controller. Should
the B2-SUBs be driven separately (e.g. when driven
from an auxiliary output of the console or for time
alignment reasons), the low cut provided by the C4-
OUT of the B2 controller can also be created for the
C4 using a standard parametric bandpass filter in a
signal processor. The parameters are f = 44 Hz,
Q = 3, Gain = –6 dB.
For a set up with C3s and C4-SUBs in a cluster
without C4-TOPs no delay is required. Due to the low
shelf filter applied to the C3 a separate signal line
feeding the C4-SUBs is needed. Be aware to feed the
C4-SUBs from the same digital device to maintain a
common latency.
6.2.6. Integration into the
C4 flying system
The vertical splays between the cabinets of a C4
array are set by load chains of different lengths. d&b
offer chains for 1°, 2.5° and 5° angles plus a
shortening chain enabling variable angles. For a
coherent coupling of adjacent cabinets the precise
alignment of the rear panels of the cabinets is
essential. Therefore it is necessary to use the d&b
Z5110.100 Hinge between the cabinets throughout
the whole column. C3 arrays have a very high vertical
directivity, therefore the use of a precise digital angle
finder to verify the desired aiming is strongly
recommended. Deviations of less than 1° can have an
immense impact on the coverage in the far field. A
laser distance finder is recommended to set the
correct array height.