The upper curves show the effect of the 'bass tilt' control on the free
field response. The lower curves show the effect of the 'treble tilt'
and 'bass roll-off' controls.
Opt-05
Floor stand
Order Code
1031-405-V
1031-405-H
Opt-09
Grille
Order Code
1031-409
The upper curve group shows the horizontal directivity characteris-
tics of 1031A in its vertical configuration measured at 1 m. The lower
curve is a
1
/
3
octave band power response, measured in an IEC
approved reverberation chamber.
Opt-01
Flight case
Order Code
1031-401
Opt-04
Wall Mount
Order Code
1031-404-V
1031-404-H
Calibrated Tilt switch. MUTE
disconnects the channel for
testing.
OptionsOptions
OptionsOptions
Options
Producer
Version
Order Code
1031-412
The tweeter driver is mounted in
a DCW to match the dispersion
characteristics to that of the
bass driver. The DCW may be
rotated for horizontal or vertical
mounting.
port techniques. Uniform perfor-
mance is obtained by the integra-
tion of the amplifiers and speakers
as a complete matched and cali-
brated package. The simple, rug-
ged construction and the pivoting
anti-vibration mounting makes
maintenance very easy and
straightforward.
A more roadable producer's ver-
sion of the 1031A is available (see
Options). This has a hard wear-
ing, textured outer surface, with
rounded corners.
AMPLIFIERS
The bass and treble amplifiers
each produce 120 W of short term
power with very low THD and IM
distortion. Special attention has
been paid to the electronic design
to ensure the highest subjective
sound quality currently possible.
The system incorporates special
circuitry for driver overload pro-
tection. Amplifier thermal overload
protection is also included.
DRIVERS
The high frequencies are repro-
duced using a 25 mm (1") metal
dome tweeter, housed in a pro-
prietary DCW, which has pure
piston behavior upto 23 kHz.
The bass driver is a high efficien-
cy 210 mm (8") polymer compos-
ite cone driver loaded in a 15 litre
(0.54 cu. ft.) vented cabinet. The
-3 dB frequency is 47 Hz and the
low frequency response extends
down to 43
Hz.
Both drivers are magnetically
shielded for applications such as
video post production, where the
stray magnet field must be
minimised.
CROSSOVER FILTERS
The crossover frequency is
2.2 kHz. To maintain uniform fre-
quency balance in differing
acoustic environments, three
special calibrated controls are
included in the active crossover
network: treble and bass tilt and
bass roll-off switches. These
make adjustments in 2 dB steps
and also allow channels to be
muted, for test purposes. A high
pass filter in the LF channel pro-
tects the woofer from subsonic
signals. The crossover network
is driven by an active balanced
input stage, with adjustable sen-
sitivity, to allow accurate level
matching with the mixing console
output.
DCW TECHNOLOGY
The revolutionary Directivity Con-
trol Waveguide Technology is a
means of greatly improving the
performance of a direct radiating
multiway loudspeaker under nor-
mal listening conditions. One of
the basic ideas is to match the
performance of the drivers in
terms of both frequency response
and directivity. This results in a
smoother overall frequency re-
sponse on and off axis. In addi-
tion, the improved directivity
control causes more direct sound
and less reflected sound to be
received at the listening position.
This provides improved stereo
imaging and ensures the system
is less sensitive to differing con-
trol room acoustics than any con-
ventional direct radiator design.
The DCW Technology improves
the drive unit sensitivity by +2 to
+6 dB thus increasing the system
maximum sound pressure level.
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Frequency Response
Power
Weight and Dimensions
