User manual

C7-TOP (2.0E)
Frequency response correction of HFA circuit
Controls on C7-TOP
controller module
C7-TOP
CUT
GRISP
MUTE
OVL
-12 dB
-6
+6
0
HFA
EP-5
1
2
3
4
5
NL4
1+
1
2+
2
n.c.
Speakon- NL4 and EP-5 pin assignments
connector wiring
Passive
Crossover
1+
1
2+
2
1+
1
2+
2
Connections
The C7-TOP cabinet is fitted with a pair of Speakon-NL4
connectors. All four pins of both connectors are wired in parallel.
The C7-TOP uses the pin assignments 1+/1. Pins 2+/2 are
designated to d&b C and E-Series active subwoofers. Using one
connector as the input, the second connector allows for direct
connection to additional loudspeakers.
The C7-TOP can be supplied with EP-5 output connectors as an
option. Pin equivalents of Speakon-NL4 and EP-5 connectors are
listed in the table on the right.
Up to two C7-TOP loudspeakers can be driven by each P1200A
power amplifier channel. Fitting one C7-TOP-CO and one
subwoofer controller module allows a single mainframe to drive
two C7-TOP's and two active subwoofer cabinets (C7-SUB or C4-
SUB). All cabinets can be linked together locally and fed by a
single four-wire cable from either mainframe output connector.
C7-TOP controller module switches
CUT switch & indicator
Set to CUT, a high pass filter with a 130 Hz cutoff frequency is
inserted in the controller signal path. The yellow CUT LED
illuminates. The C7 system is now configured for use either with
d&b C-Series active subwoofers or the B2 subwoofer set to
standard mode.
For high level music applications with the C7-SUB or C4-SUB, we
recommend a ratio of two subwoofers per C7-TOP cabinet.
When C7-TOP´s are flown without additional subwoofers the
cabinets should be operated full range, i.e. CUT mode not selected
on the controller module. Low end support can then be provided
by C7-SUB systems in 100Hz mode or a B2 system in INFRA mode.
A single B2-SUB is enough to support two C7-TOP cabinets. The
low crossover frequency allows the subwoofers to be placed
centrally and to be driven with a mono signal.
HFA switch & indicator
In HFA mode (High Frequency Attenuation), the HF response of the
C7 system is rolled off. The yellow HFA LED illuminates. The HFA
circuit configures the C7-TOP to provide a natural, balanced
frequency response at close listening positions.
High Frequency Attenuation begins gradually at 1 kHz, dropping
to approximately 3 dB down at 10 kHz. This roll off mimics the
decline in frequency response experienced when listening to a
system from a distance in a typically reverberant room or
auditorium.
The HFA facility thus provides an easy way to adapt C7-TOP
loudspeakers for use close to an audience, for example as nearfills
or delays.