Cloud CX-A450-CXA-850 Datasheet

Cloud CX-A450-CXA-850 Datasheet
Multi-Channel Power Amplifiers
CX-A450 & CX-A850
482.6mm / 19"
88mm
/ 3 1/2"
(2U)
Cloud CX-A450 front view
Cloud CX-A450 rear view
482.6mm / 19"
88mm
/ 3 1/2"
(2U)
Cloud CX-A850 front view
Cloud CX-A850 rear view
General Description
The Cloud CX-A450 and CX-A850 are high-quality multichannel 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
Power
4 x 50 W
8 x 50 W
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).
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.
• General purpose, high quality 4 and 8-channel power amplifiers
with superior audio performance
• 4 x 50 W (CX-A450) or 8 x 50 W (CX-A850) into 4 ohms
• Very low inter-channel crosstalk
• Thermal protection
• VI limiting
• DC offset protection
• Dynamic Clipping Protection
• Switch-on delay (for speaker protection during power
rail stabilisation)
• Pairs of channels may be operated in Bridge Mode
• Per-channel, front-panel LEDs for signal presence, peak level
and protection status
• Balanced line level inputs with gain trim
• Rear panel switches to configure for multichannel, stereo
or mono operation
• Optional internal 4-channel 100 V/70 V transformer
module (CX-A450 only)
• Optional externally-mountable 100 V/70 V transformers
(per channel)
• Optional remote volume control (per-channel)
• A range of optional per-channel EQ cards, to match
various popular loudspeakers
• 2U 19” rackmounting units
• Variable speed forced-air cooling
• Five year warranty
Block Diagram
CX-A850 ONLY
Input Routing
The input routing switches of the CX-A450 and CX-A850
permit various permutations of mono, stereo and multi-channel
operation without any external parallel wiring. Some possibilities
are shown below:
System Example
CX-A450 and CX-A850 amplifiers’ exceptional crosstalk
performance make them particularly suitable for any application
where different audio sources need to be routed to various zones
(parts of a building). They are equally suitable in a situation where a
common audio source needs to be reproduced at different levels in
various zones. The flexibility of the amplifiers’ input routing makes
it possible to handle a mixture of mono and stereo sources without
complex wiring.
In another situation, it might be necessary to route the same
audio to several different zones, but allow each zone to adjust
its own level. This can be easily achieved by providing each zone
with a Cloud RL-1 remote volume control plate, and setting the
amplifier’s input routing to parallel all the channels. Only a single
input feed needs to be supplied, to Channel 1
In many applications, the power amplifiers will be used in combination
with a Cloud Zoner, to permit paging and emergency override.
An example is the CX263 zoner, which supports three zones,
one of which may be stereo. In the example shown below, where
a CX263 is used with a CX-A450, Chs. 1 & 2 are used to drive
stereo to Zone 1, while Chs. 3 & 4 are used for the mono signals to
Zones 2 and 3 respectively.
Similar mono-stereo arrangements are possible with the Cloud
CX163 and Z4II zoners.
Graphs
Audio Precision
CXA450 Frequency Response
05/31/11 15:06:04
+3
+2
+1
d
B
r
+0
-1
-2
-3
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Audio Precision
+0
T
Sweep
Trace
Color
Line Style
Thick
Data
Axis
Comment
1
1
Blue
Solid
2
Anlr.Level A
Left
CH2 Freq Response Sig=-6dBu
CX-A450 Crosstalk
05/31/11 12:21:05
Audio Precision
0.3
T
d
B
r
05/31/11 13:11:59
T
0.25
-20
CX-A450 THD+N
0.2
-40
%
-60
0.15
0.1
-80
0.05
-100
20
50
100
200
500
1k
2k
5k
10k
20k
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Hz
Sweep
Trace
Color
Line Style
Thick
Data
Axis
Comment
Sweep
Trace
Color
Line Style
Thick
Data
Axis
1
1
Red
Solid
1
Anlr.Bandpass
Left
CH2 to CH1
1
1
Red
Solid
1
Anlr.THD+N Ratio
Left
Audio Precision
CX-A850 Frequency Response
Comment
05/31/11 11:22:06
+3
+2.5
+2
+1.5
+1
d
B
r
+0.5
+0
-0.5
-1
-1.5
-2
-2.5
-3
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Audio Precision
+0
Sweep
Trace
Color
Line Style
Thick
Data
Axis
Comment
1
1
Red
Solid
1
Anlr.Ampl
Left
CH2 Frequency response
CX-A850 Crosstalk
05/31/11 13:23:50
Audio Precision
0.3
T
05/31/11 13:27:47
T
0.25
-20
d
B
r
CX-A850 THD+N
0.2
-40
-60
%
0.15
-80
0.1
-100
20
0.05
50
100
200
500
1k
2k
Hz
5k
10k
20k
20
Sweep
Trace
Color
Line Style
Thick
Data
Axis
1
1
Red
Solid
1
Anlr.Bandpass
Left
50
100
200
500
Comment
1k
2k
5k
10k
Hz
Sweep
Trace
Color
Line Style
Thick
Data
Axis
Comment
1
1
Red
Solid
1
Anlr.THD+N Ratio
Left
CH2 THD+N Sig=-10dBu
20k
Technical Specifications
CX-A450
Performance
Inputs
General
CX-A850
50 W/ch into 4 ohms (nominal,
continuous sinewave)
Output Power (Normal Mode):
50 W/ch into 4 ohms (all chs driven)
Output Power (Bridge Mode):
100 W nominal into 8 ohms
Frequency Response:
10 Hz – 20 kHz, +0/-0.5 dB
High Pass Filter:
-3 dB @ 65 Hz, switchable per-channel
Distortion:
THD+N: <0.02% typical, 1 kHz,
60 W into 4 ohms, one channel driven,
22 Hz – 22 kHz
Noise:
<-96 dB rel. rated output, unweighted, 22 Hz – 22 kHz
Crosstalk:
<-70 dB, rel. rated output into 4 ohms,
10 kHz
VCA module THD+N:
<0.03%, 1 kHz, 22 Hz – 80 kHz BW
Type & connectors
Electronically balanced, 3-pin 3.5 mm-pitch screw-terminal connectors
Sensitivity
0 dBu (0.775 Vrms)
Input Impedance
10 kohms (balanced)
Output Connectors (lo-Z)
2-pin 5 mm-pitch screw-terminal connectors
Output Connectors (100/70 V)
Screw terminals
Power input
230 V ±5% (115 V ±5% available)
Mains protection
Replaceable fuse, T3.15A H
THD+N: <0.007% typical, 1 kHz,
60 W into 4 ohms, one channel driven,
22 Hz – 22 kHz
<-82 dB, rel. rated output into 4 ohms,
10 kHz
Replaceable fuse, T4A H
VI limiting, DC offset, Thermal, Switch-on Delay & Dynamic Clipping Protection
Status Indicators
Signal present, Peak & Protection
Cooling
Force cooled, variable speed DC fan
Dimensions (W x H x D)
482.6 x 88 (2U) x 300 mm
Weight
7.15 kg
8.8 kg
Architect’s and Engineer’s Specification
The power amplifier shall have six identical channels. Each channel
shall be capable of driving 120 W into a 4 ohm load when all channels
are driven simultaneously.
output, and excessive combination of output voltage and current.
The amplifier’s outputs shall be on 2-pin 5 mm-pitch screw-terminal
connectors.
The amplifier’s front panel shall incorporate an AC power switch, an
LED indicating POWER ON, and LEDs indicating Signal Present, Peak
Level and Protect status for each channel. The Signal Present LEDs
shall illuminate when the input signal exceeds -22 dBu when the
input sensitivity is set to maximum.The Peak LEDs shall illuminate when
the output signal level is 0.5 dB below full output power.The Protect
LEDs shall indicate activation of the channel protection circuitry.
A range of optional, single-channel transformer modules, and suitable
rackmounting housings, shall be available to permit the amplifier to
drive 100 V-line and 70 V-line loudspeaker systems.
The amplifier shall be provided with one input per channel and be
able to operate in the following configurations as a minimum: all
channels independent, one input feeding all channels or two inputs
feeding the amplifier channels in pairs for stereo operation. Input
sensitivity will be provided for each channel via a rear panel control
permitting a range of operation from not less than 90 dB attenuation
(min.) to unity gain (max.).The inputs shall be electronically balanced
and capable of operating with both balanced and unbalanced sources.
The input impedance shall be not less than 10 kohms in balanced
mode. The input connectors shall be 3-pin XLR female type. It shall
be possible to enable a high-pass 3rd order filter with a turnover
frequency of 65 Hz independently in each amplifier channel.
Each channel shall deliver its rated power from an input signal of
0 dBu with input sensitivity controls set at maximum. Output mute
protection on power-up and thermal protection shall be provided.
The amplifier will also be protected against short-circuits at the
Issue_2.0
An optional control panel shall be available for any or all amplifier
channels, to allow remote adjustment of channel gain. The variable
gain element shall be an optional internally-fitted module, able to
control the gain of two channels. The remote control connector shall
be of Euroblock type. It shall be possible to link pairs of channels to
enable one remote control panel to control two channels. It shall
also be possible to fit optional EQ cards to any or all channels to suit
a range of current, popular loudspeakers types.
The amplifier shall be built in a steel chassis suitable for mounting
in a standard 19” equipment rack, and occupy two rack spaces. Two
speedforced-air cooling shall be employed.
The amplifier shall be available in versions operating on either 230 V
or 115 V AC mains, the intended mains voltage to be specified by the
user at the time of order.
The power amplifier shall be the Cloud CX-A6; the remote level
control panel the Cloud RL-1, and the 2-channel gain control module
the Cloud VCA-2.
E&OE
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