Cloud CX261 Datasheet
CLOUD CX261 Single Zone Mixer
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Cloud CX261 - front panel view
Cloud CX261 - rear panel view
General Description
The Cloud CX261 is a 1U rack-mounting stereo audio mixer
intended for multi-purpose areas where simple control of highquality background music needs to be combined with a flexible range
of paging options.
The CX261 mixes any one of six stereo line inputs with one or two
microphone inputs. Separate front panel controls for music source
selection, music level and mic levels are provided. Either music level
only, or music source and level may be controlled remotely if wished
using standard Cloud RL or RSL Series remote control plates. In
addition to the main stereo output, there is a transformer-isolated
mono auxiliary output which is suitable for providing a MOH (Music
On Hold) output to a telephone system. All outputs are balanced at
line level.
Line 1’s input may be switched (on the rear panel) to an alternative
front-panel 3.5 mm jack connector, to permit convenient connection
of an MP3 player, laptop or similar portable audio source. A front
panel LED confirms its selection. This input is provided with an
independent front panel gain control and LED signal level indication.
The CX261 is fully compatible with the Cloud PM Series of paging
microphones. The mixer may also be configured to operate with
third-party paging systems: either mic input may be enabled via a
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Versatile stereo mic/line mixer for installed audio applications
Six (unbalanced) stereo line inputs with individual gain controls
Two electronically-balanced mic inputs
Front panel control of music source/level and both mic levels
Front panel input (3.5 mm jack) for MP3 player, etc., with gain
control (overrides rear panel LINE 1 input) and LED level
indication
Separate HF & LF EQ adjustments for music and mic sources
MIC 1 input configurable as transformer-isolated line input
(with separate gain control) for connection to phone system
MIC 1 priority over MIC 2 (selectable)
Short-to-ground access connector or VOX-triggered voiceover-music priority on both MIC 1 and MIC 2 inputs
simple short-to-ground access connection. This may be bypassed if
wished, in which case the mic inputs are always active. A switchable
isolating transformer configures MIC 1 input for direct connection
to a telephone system, enabling paging messages to originate from
an extension. Mic-over-music priority (Automatic Voice-Over) may
be selected by internal jumper, and may be triggered either by the
access connector or automatically by a mic signal (VOX mode).
Additionally, MIC 1 may be set to have priority over MIC 2. Phantom
power is available at either mic input (set by internal jumper). Bicolour LEDs indicating signal level are fitted to the rear panel to aid
mic gain adjustment.
Line Input 6 may be set to have priority over any other selected
music input to facilitate connection of a jukebox, digital sound store
or similar device. One of three release times (up to 12 seconds) may
be selected by internal jumper, to unobtrusively restore the original
music source.
EQ cards to suit a range of popular installation loudspeakers from
various manufacturers may be fitted to either or both channels of
the main output. In common with most Cloud products, a Music
Mute Input is provided, which may permit compliance with local Fire
Authority regulations; the microphone inputs remain active when
the Music Mute is applied.
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Selectable LINE 6 priority with choice of release times
Music Mute control input (N/O or N/C) for interface to
emergency system
Compatible with standard Cloud remote control plates – RL-1
Series (music level) and RSL-6 Series (music level and source
selection)
Electronically-balanced stereo main output
Mixer can be configured by internal jumper for mono operation
Transformer-isolated mono auxiliary output for use with
telephone MOH systems
Aux output source selection (internal jumper) – follows main
output or always LINE 2
Optional speaker EQ cards available
1U 19” rack mounting unit
All Cloud products are exclusively designed in the UK.
Every Cloud product is exhaustively tested for electronic performance and sonic perfection in Sheffield, England.
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Block Diagram
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System Example
PAGING MIC
MIC 1 IN
ADDITIONAL MIC
STEREO
POWER
AMPLIFIER
MIC 1 ACCESS
MIC 2 IN
MAIN AREA
MAIN OUT
MIC 2 ACCESS
MP3
PLAYER
MP3 INPUT
L
R
DVD
PLAYER
MUSIC
SERVER
DTV BOX
RSL-6
2
2
2
2
SAT BOX
2
2
CD
PLAYER
JUKEBOX
LINE 1
CX261
LINE 2
REMOTE
LINE 3
LINE 4
LINE 5
PAGING OUTPUT
LINE 6 (PRIORITY)
AUX OUT
MUSIC MUTE
MUSIC SOURCES
MOH INPUT
TELEPHONE
SYSTEM
(all stereo)
FROM FIRE
CONTROL PANEL
The example shows a CX261 used to provide stereo music,
announcements and paging in a multi-purpose area. The area can
set its own music source and volume by means of the local RSL-6
remote control plate (optional). Music source and level could be set
from the front panel of the mixer itself if preferred.
Paging is achieved using a paging mic such as the Cloud PM1,
connected to Mic 1 input; this would typically be located elsewhere
in the building. Additional announcements to any zone can be made
from the separate microphone connected at Mic 2 input. This could
be a second PM1 in a different location if needed.
Six stereo music sources of various types are shown connected; an
MP3 player is also shown connected to the front-panel input. (When
the MP3 player is plugged in, the DVD player will not be available.)
Note that the jukebox is shown connected to Line input 6; if Line 6
Priority is enabled in the mixer, then whenever the jukebox is in use
it will always be heard, regardless of the music source setting. This
facility is also useful for connection to a digital sound store to allow
pre-recorded announcements to be played.
The Auxiliary Output is used in the example to provide Music On
Hold (MOH) to the building’s telephone system. The CX261 can be
configured so that the music source at this output either follows
the currently-selected source or is permanently fed by the source
connected to Line Input 2. An additional option would be to connect
an audio output of the telephone system (if available) to Mic 1 input;
this would permit paging from any suitably-enabled phone extension.
In this case, any paging microphone would be connected to Mic 2
Input instead of Mic 1.
Connecting the Music Mute input to the Fire Control Panel will
ensure that all music sources will mute should an emergency
situation arise.
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Technical Specifications
LINE INPUTS
Frequency Response 20 Hz - 20 kHz, ±0.5 dB
Distortion
<0.05% typical, 1 kHz
Sensitivity
0.775 V (0 dBu), ±12 dB
Input Gain Control 24 dB range
Input Impedance48 kohms
Headroom
>20 dB
Noise
-88 dB rel 0 dBu (typical); A-weighted, rms
Equalisation
LF: ±10 dB @ 50 Hz, HF: ±10 dB @ 10 kHz
MP3 INPUT
Frequency Response
20 Hz – 20 kHz, ±0.5 dB
Distortion
<0.05% @ 1 kHz
Sensitivity range
-20 dBu to +4 dBu
Gain adjustment24 dB
MICROPHONE INPUTS
Frequency Response -3 dB @ 100 Hz (filter), ±0.5 dB @ 20 kHz
Distortion <0.05%, 20 Hz - 22 kHz
Gain Range
40 dB
Sensitivity
-10 dBu to -50 dBu
Input Impedance
>2 kohms (balanced)
Common Mode Rejection
1 kHz, >70 dB
Headroom
>20 dB
Noise
<-125 dB EIN, A-weighted, 150 ohms
Equalisation
LF: ±10 dB @ 100 Hz, HF: ±10 dB @ 5 kHz
TEL INPUT
Frequency Response
-3 dB @ 100 Hz (filter); <-0.5 dB @ 20 kHz
Distortion
<0.05%, 200 Hz – 20 kHz
Sensitivity
-20 dBu to + 4 dBu
Headroom
>20 dB
OUTPUTS
Nominal Output Level
0 dBu (MAIN); -6 dBu (AUX/MOH)
Minimum Load Impedance 1.2 kohms (MAIN); 600 ohms (AUX/MOH)
Maximum Output Level
+20 dBu (MAIN); 0 dBu (AUX/MOH)
GENERAL
Power Input
230 V ±10% (optional external 115/230 V transformer available)
Fuse Rating T100mA 230V
Fuse Type 20 mm x 5 mm 250 V
Dimensions Net (w x h x d)
482 mm x 44 mm (1U) x 155 mm; 19” x 1.7” x 6.1”
Dimensions Gross (Shipping)
560 mm x 140 mm x 290 mm; 22” x 6” x 11”
Weight (Net)
2.15 kg / 4.82 lbs
Weight (Gross)
3.5 kg / 7.7 lbs
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Performance Graphs
CX261 - Line EQ Curves
CX261 - Mic EQ Curves
+15
+15
+12.5
+12.5
+10
+10
+7.5
+7.5
+5
+5
d
B
r
+2.5
d
B
r
+0
-2.5
+2.5
+0
-2.5
-5
-5
-7.5
-7.5
-10
-10
-12.5
-12.5
-15
20
50
100
200
500
1k
2k
5k
10k
-15
20
20k
50
100
200
500
1k
Hz
Hz
Sweep
Trace
Color
Line Style
Thick
Data
Axis
Comment
Sweep
Trace
Color
Line Style
Thick
Data
Axis
Comment
1
2
3
4
1
1
1
1
Black
Black
Black
Black
Solid
Dot
Dash
Dash Dot
1
1
1
1
Anlr.Ampl
Anlr.Ampl
Anlr.Ampl
Anlr.Ampl
Left
Left
Left
Left
HF Cut
HF Boost
LF Cut
LF Boost
1
2
3
4
1
1
1
1
Black
Black
Black
Black
Solid
Dot
Dash
Dash Dot
1
1
1
1
Anlr.Ampl
Anlr.Ampl
Anlr.Ampl
Anlr.Ampl
Left
Left
Left
Left
HF Cut
HF Boost
LF Cut
LF Boost
CX261 - MOH Frequency Response
+4
+2
-0
-2
-4
d
B
u
-6
-8
-10
-12
-14
-16
-18
-20
20
50
100
200
500
1k
Hz
2k
5k
10k
20k
2k
5k
10k
20k
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Architect’s and Engineer’s Specification
The mixer shall be equipped with six unbalanced stereo music inputs
on rear panel phono sockets (RCA jacks) and two electronically
balanced microphone inputs on rear panel Euroblock connectors. It
shall be possible to select an alternative front panel 3.5 mm stereo
jack socket as the input connector for one line input; selection of this
input shall be made by a rear panel push-button switch, with front
panel LED indication of its selection. The alternative input shall have
a dedicated front panel level control and three LEDs indicating signal
levels of -20 dBu (green), -4 dBu (yellow) and 0 dBu (red).
The music input to be used shall be selected by a 6-position front
panel rotary switch. It shall be possible to control the level of the
music source independently of the microphone levels.
The two microphone inputs shall be mixed and summed with the
selected music input. Each microphone input shall have its own front
panel level control. Each music input and each microphone input shall
also have a rear panel sensitivity control; the microphone inputs shall
have a bi-colour LED (green/red) to aid adjustment. Independent
2-band equalisation adjustment shall be provided on the rear panel
for i) the selected music source and ii) summed microphone inputs.
Phantom power shall be available at either or both microphone
inputs when selected by internal jumpers.
It shall be possible to configure one microphone input to accept a
line-level input directly from a telephone system by a rear panel pushbutton switch. In this configuration, the input shall be galvanically
isolated from the source by an internal transformer, and independent
gain control shall be provided.
Control inputs shall be provided to activate either microphone
input by external contact closure; it shall be possible to configure
the mixer such that this function is overridden and either or both
microphone inputs are always active. It shall be possible to configure
the mixer to perform the following additional functions: i) when
activated by its control input, MIC 1 will take priority over MIC 2; ii)
detection of a signal on either microphone input will automatically
reduce the music level by 30 dB, iii) one line input will automatically
override all others when a signal is present, even if unselected, and a
choice of three release times of up to 12 seconds shall be available
to restore the original input.
Cloud Electronics Limited
140 Staniforth Road, Sheffield, S9 3HF. England.
Telephone: +44 (0)114 244 7051 Fax: +44 (0)114 242 5462
Web: www.cloud.co.uk E-mail: info@cloud.co.uk
Issue_1.0
Optional remote control plates shall be available to permit control
of music level only or music level and input selection; it shall be
possible to retrofit these to the mixer at any time. The remote
control plates shall connect via a rear panel Euroblock connector.
A push-button switch shall be provided to activate this connector; a
front panel LED will confirm activation and the corresponding front
panel controls will be disabled. When remote control of music level
only is required, it shall be possible to retain front panel control of
source selection by moving an internal jumper. An external control
input shall be provided to allow muting of the music source by a fire
alarm or other external emergency system via isolated, ‘volt-free’
contacts, and this input shall be configurable to respond to either a
short or open external circuit.
The mixer shall have three outputs: main L & R stereo and a mono
auxiliary music output. It shall be possible to configure the mixer
by internal jumper to combine the L and R signals for mono output
operation. The main outputs shall be electronically balanced and
the auxiliary output shall be transformer balanced and galvanically
isolated so as to be suitable for connection to a telephone system as
a Music On Hold source.All outputs shall be on rear panel Euroblock
connectors. The auxiliary output shall be configurable internally to
either follow the selected music source, or to be permanently fed
with a mono sum of one line input; this line input will not be the
same one that can be set to have priority over the other line inputs.
The microphone inputs shall have no signal path to the auxiliary
output. It shall be possible to set the level at the auxiliary output
independently of the main outputs with a rear panel control.
A range of optional EQ cards shall be available to optimise the
mixer for use with popular installation loudspeakers from various
manufacturers. It shall be possible to fit these in either of the
channels of the main output.
The mixer shall be built in a 1U steel chassis for mounting in a
standard 19” rack. The mixer will be fitted with a front-panel power
switch with LED indication.The mixer shall be powered by 230 V AC
mains, connected via a detachable IEC cable. An optional, external
115/230 V transformer shall be available to allow the mixer to
operate on a 115 V mains supply.
The mixer shall be the Cloud CX261; the optional remote control
plates shall be the Cloud RSL-6 Series (music level and source
selection) and the Cloud RL-1 Series (music level only).
Cloud Electronics USA
2065 Sidewinder Drive, Suite 200, Park City,
Utah 84060. United States of America.
Toll Free: 0855 810 0161
Web: www.cloudusa.pro E-mail: sales@cloudusa.pro
E&OE
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