B2-SUB
(1.1E)
B2-CO rear panel
C4 and B2-SUBs, 4:1 ratio
20
100
500
-5
0
5
10
-10
-15
-20
-25
-30
C4 system driven from C4-OUT and B2-
SUB, 2:1 ratio (acoustic)
20
100
500
-5
0
5
10
-10
-15
-20
-25
-30
OUTPUT
PIN ASSIGNMENT
A LOW OUT +
B LOW OUT -
C SPEAKER ID
D SPEAKER ID
E SENSE DRIVE +
F SENSE DRIVE -
G nc
H nc
*
INPUT
INPUT LINK
C4 OUT
Using the C4-OUT socket to drive C4-SUBs
Although the C4-SUB operates very effectively down to 50 Hz
(
5 dB), in some applications the ability to reproduce frequencies
below this cut-off frequency can be an advantage. Using the B2
subwoofer, not only provides the desired LF extension, but also
improves the low frequency headroom of the combined system.
Selecting the INFRA switch on the B2 controller module front panel
configures the B2 system to operate around 50 Hz covering a one
octave band from 32 Hz to 68 Hz (
5 dB). Used in INFRA mode, a
B2 system, with just a single cabinet, delivers enough low-end bass
to match the output of four C4-SUB cabinets. When C4-SUBs and
B2-SUBs are operated together in an identical acoustic
environment and their controllers set to the same level, the low
frequency limit of the combined system is 37 Hz (
5 dB).
With fewer than four C4-SUBs per B2 cabinet, the headroom of
the C4 system can be increased by altering the crossover point be-
tween the two bass systems simply by driving the C4-SUB
systems from the C4-OUTPUT provided on the rear panel of the
B2-CO controller.
The B2-CO controller C4-OUT socket provides a specially tailored
signal with a relatively narrow-band level reduction around 50 Hz
- the rest of the audio band remains unaffected. It therefore does
not matter whether the mid/high cabinets (C4-TOPs or C6) are
driven directly or via the C4-OUT - the signal they produce is the
same in each case.
Used with a B2 system and driven from the C4-OUT socket, the
low frequency limit of the C4-SUBs is raised to around 60 Hz. This
raised crossover frequency is not acoustically critical, and is in fact
beneficial, since the band below 60 Hz is more than adequately
handled by the B2 system. If most of the C4-SUBs are flown, then
due to the loss of ground coupling, the effective (acoustic) LF
output of the system is reduced. Despite that, the increased LF hea-
droom using the C4-OUT connection still gives a worthwhile
improvement to the LF performance of the combined system.
