7. CONFIGURATIONS COBRA-SYSTEM ( PWH / TOP )
The following illustrations show the basic set of an active 2-way COBRA SYSTEM with the planar waveguide
bass horns COBRA PWH as well as various possible arrangements.
The COBRA SYSTEM illustrated below with 4 x COBRA TOPs and 4 x COBRA PWH bass horns generates
a maximum SPL of 137 dB L + 137 Db R in the mid/high frequency range and up to 144 dB in the low
frequency range.
DSP244
L 2400
L 2400
INPUT B
CP-44
RS-485
IN OUT
TOP/SUB N.C. TOP/SUB
B
N.C.
B
A
A
INPUT A
COBRA-SYSTEM
BASIC-SET - 2
4x COBRA-TOP
4x COBRA-PWH
1x CSW 25 2,5°
1x CSR-12
EXTENSION : 2x COBRA-TOP
EXTENSION 2x COBRA-PWH
COBRA-SYSTEM Basic set and expansion possibilities
DSP244
L 2400
L 2400
INPUT B
CP-44
RS-485
IN OUT
TOP/SUB N.C. TOP/SUB
B
N.C.
B
A
A
INPUT A
COBRA-SYSTEM
EXTENSION - 2
( 2x BASIC-SET 2 )
8x COBRA-TOP
8x COBRA-PWH
2x CSW 25 2,5°
2x CSR-12
DSP244
L 2400
L 2400
INPUT B
CP-44
RS-485
IN OUT
TOP/SUB N.C. TOP/SUB
B
N.C.
B
A
A
INPUT A
EXTENSION
4x COBRA-PWH
COBRA-SYSTEM maximum sensible expansion variation
The “long throw” and “wide” configurations described in Chapter 6 hold good for all types of tops and bass
enclosures. Tops are arranged in a horizontally angled configuration where the need is for particularly
wide coverage (stage at the long-side) or stacked vertically when the need is for coverage over long
distances (stage at the narrow side).
COBRA SYSTEM with COBRA PWH
For especially powerful and far-
reaching bass reproduction of a wide
variety of styles of music, COBR
PWH bass horns can be integrated into
the COBRA SYSTEM.
Two floor-standing COBRA PWHs
stacked one on top of the other raise
the COBRA TOPs to the required level
above the heads of the first few rows o
the audience.
Grooves on the top and sides of the
enclosures permit a multitude o
different arrangements and ensure
absolute stability when stacking the
enclosures.
Depending upon the panel
configuration, two 8-pin and two 4-pin
IN/OUT sockets allow the system to be
connected up in active 2-way COBR
SYSTEM (4-pole) and active 4-wa
COBRA-4 SYSTEM (8-pole) modes
using only one system cable per stack.
maximum of 6 COBRA TOPs and 6
COBRA PWHs can be driven from the
CSR-12 amp rack.
The mixing of COBRA SUB and
COBRA PWH enclosures is also
possible, although optimal results are
obtained with bass enclosures of the
same type in conjunction with the
appropriate preset of the DSP 244
controller.
Bass enclosures are arranged centrally in front of the stage (as a bass cluster) when maximum almost
omni-directional sound pressure level is called for.
With the typical L / R arrangement alongside the stage, the width should not exceed 6 to 8 metres to avoid
destructive interference (or ‘cancelling’) in the area in front of the PA as a result of path length differences. If
wider arrangements > 10 metres are called for, it is preferable to spread the bass enclosures along the entire
width of the stage to form a horizontal bass array. With this configuration, maximum projection and a more
even distribution of the low frequency range across the entire width of the audience area is achieved without
pronounced cancellation due to path length differences to the various bass enclosures.
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