Cloud CX-A450 Manual

CLOUD MULTI-CHANNEL POWER AMPLIFIERS
MODELS CX-A450 & CX-A850

General Description

The Cloud CX-A450 and CX-A850 are high-quality multi-
channel power amplifiers designed for relatively low-power sound
reinforcement applications in commercial or industrial premises.
They are ideal for situations where the various locations of the
building require different programme material and/or levels.
The two models are:
MODEL
CX-A450
CX-A850
The amplifiers will deliver their rated power into 4 ohm loads for
long periods of time. Safety features of the design include Cloud's
Dynamic Clipping Protection circuitry, VI limiting, switch-on delay
(5 seconds) and protection against DC offset or thermal overload.
Both models are built in a 2U steel enclosure, and use variable–
speed forced-air cooling.
Any two channels may be wired in Bridge Mode, allowing power
outputs of double the normal rating to be delivered to a load of
8 ohms (minimum).
140 Staniforth Road, Sheffield, S9 3HF. England. Telephone: +44 (0)114 244 7051 Fax: +44 (0)114 242 5462 Web: www.cloud.co.uk Email: info@cloud.co.uk
CX-A450
FOUR CHANNEL POWER AMPLIFIER
CH 1 CH 2 CH 3 CH 4
RL-1 RL-1 RL-1 RL-1
REMOTE REMOTE REMOTE REMOTE
LEVEL LEVEL LEVEL LEVEL
1 2 3 1 2 3 1 2 3 1 2 3
1 2 3 1 2 3 1 2 3 1 2 3
1 2 3 4
(OUT) (OUT) (OUT)
1 1 2
(IN) (IN) (IN)
2 3 4
SOURCE SOURCE SOURCE
1 2 3 1 2 3 1 2 3 1 2 3
LEVEL LEVEL LEVEL LEVEL
CX-A 850
EIGHT CHANNEL POWER AMPLIFIER
CH 1 CH 2 CH 3 CH 4 CH
RL-1 RL-1 RL-1 RL-1
REMOTE REMOTE REMOTE REMOTE REMOTE
LEVEL 1 2 3 LEVEL 1 2 3 LEVEL 1 2 3 LEVEL 1 2 3 LEVEL
1 2 3 1 2 3 1 2 3 1 2 3
1 2 3 4
(OUT) (OUT) (OUT) (OUT)
1 1 2
(IN) (IN) (IN) (IN)
2 3 4
SOURCE SOURCE SOURCE SOURCE
1 2 3 1 2 3 1 2 3 1 2 3
LEVEL - - LEVEL - - LEVEL - - LEVEL - -
POWER
4 x 50 W
8 x 50 W
Cloud Electronics Limited
Cloud CX-A450 - front panel view
POWER INPUT
FUSE
REPLACE FUSE
WITH SAME TYPE
40-60Hz
AND RATING
230V - 3.15A H
115V - 6.3A H THIS PRODUCT MUST BE EARTHED
SPEAKER OUTPUTS
MINIMUM LOAD 4OHMS
OUTPUT RATING 50W/4OHMS
Cloud CX-A450 - rear panel view
8 7 6
Cloud CX-A850 - front panel view
POWER INPUT
5 CH 6 CH 7 CH 8
RL-1 RL-1 RL-1 RL-1
REMOTE REMOTE REMOTE
1 2 3 LEVEL 1 2 3 LEVEL 1 2 3 LEVEL 1 2 3
THIS UNIT MUST BE EARTHED
1 2 3 1 2 3 1 2 3 1 2 3
SPEAKER OUTPUTS
5 6 7 8
(OUT) (OUT) (OUT)
1 2 1 2
OUTPUT RATING 50W / 4OHMS
(IN) (IN) (IN)
5 6 7 8
SOURCE SOURCE SOURCE
1 2 3 1 2 3 1 2 3 1 2 3
LEVEL - - LEVEL - - LEVEL - - LEVEL - -
Cloud CX-A850 - rear panel view
In addition to the power switch and associated LED, the front panel is
fitted with three LEDs for each channel, confirming signal presence,
peak level and activation of the protection circuitry. Rear panel
controls are provided for individual channel gain trims and input
routing to configure the amplifier in various combinations of mono,
stereo or multi-channel operation. The inputs are electronically
balanced.
The CX-A450 and CX-A850 may also be used with 100 V/70 V-line
loudspeaker systems by the addition of standard Cloud accessories.
The CXL-4160 is a four channel transformer module which can
be internally fitted to the CX-A450, while the CXL-40T is a single
channel toroidal transformer module for external mounting. For
installation convenience, the CXL-800, a 2U rackmounting assembly
which can hold up to eight CXL-40s, is also available. To prevent LF
transformer saturation in 100 V/70 V-line systems, a 65 Hz high-pass
filter may be enabled for each channel individually, by internal jumper.
Other standard options are Cloud RL-1 remote volume control
plates, the VCA-5 single-channel VCA card (required for level
control by RL-1), and EQ cards to suit various makes and models of
loudspeakers. Remote level control or speaker EQ may be fitted to
any or all channels.
C l e a r l y b e t t e r s o u n d
PROTECT
PEAK
SIGNAL
4
3 2 1
POWER
100V/70V LINE
V 5%
OUTPUTS
100V/70V
CH1 LINE OUTPUT
CH2
DANGER
HIGH VOLTAGE
CH3
DO NOT
REMOVE
CH4 THIS COVER
PROTECT
PEAK
SIGNAL
5 4 3 2 1
POWER
5%
40-60Hz
REPLACE FUSE WITH SAME
TYPE AND RATING
MIN LOAD 4 OHMS FUSE
230V - T4A
115V - T8A