Cloud Electronics CXM User Manual

CXM Mixer

Installation & User Guide

Cloud Electronics Limited

140 Staniforth Road, Sheffield, S9 3HF England

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Fax [phone]

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web site http://www.cloud.co.uk

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CXM Technical

Section Page

MANUAL

1

CXM MODULAR MIXER

Technical manual

Contents

1 General

1.01 General Description ........................................................................................ 3

1.02 Main Frame..................................................................................................... 3

1.03 Power Supply...............................................................................................3-4

2 CS1 Stereo Music Module

2.01 CS1 Stereo Music Module .............................................................................. 5

2.02 Input Amplifier Equalisation............................................................................. 5

2.03 Input Specification........................................................................................... 5

2.04 Input Gain........................................................................................................ 5

2.05 Input Select ..................................................................................................... 5

2.06 Sub-Sonic Filter............................................................................................... 5

2.07 Equalisation..................................................................................................... 5

2.08 Stereo / Mono.................................................................................................. 6

2.09 Crossfade Assignment.................................................................................... 6

2.10 Auxiliary sends ................................................................................................ 6

2.11 Balance ........................................................................................................... 6

2.12 PFL (Pre Fade Listen)..................................................................................... 6

2.13 Peak LED........................................................................................................ 6

2.14 Channel Fader ................................................................................................ 6

2.15 Remote Start Switch ....................................................................................... 6

2.16 PCB Jumpers.................................................................................................. 7

........................................................................................................ 3

................................................................... 5

3 CM1 Microphone Module

3.01 Facilities .......................................................................................................... 8

3.02 Input Specification........................................................................................... 8

3.03 Input Select ..................................................................................................... 8

3.04 Input Gain........................................................................................................ 8

3.05 Phantom Powering.......................................................................................... 8

3.06 Equalisation..................................................................................................... 8

3.07 100Hz High Pass Filter ................................................................................... 8

3.08 Equalisation..................................................................................................... 9

3.09 Auxiliary Sends................................................................................................ 9

3.10 Pan Control ..................................................................................................... 9

3.11 PFL (Pre Fade Listen)..................................................................................... 9

3.12 Peak LED........................................................................................................ 9

3.13 Channel Fader................................................................................................. 9

3.14 Channel Mute Switch ...................................................................................... 9

3.15 Channel Insert................................................................................................. 9

3.16 PCB Jumpers................................................................................................ 10

..................................................................... 8

CXM Technical

MANUAL

2

4 M2 Master Module

4.01 X-Filter........................................................................................................... 12

4.02 Crossfade...................................................................................................... 12

4.03 Chopfade....................................................................................................... 12

4.04 Signal Routing............................................................................................... 12

4.05 Music Only Output......................................................................................... 12

4.06 Microphone Only Output ............................................................................... 12

4.07 Main Output..............................................................................................12-13

4.08 Output 2......................................................................................................... 13

4.09 AVO............................................................................................................... 13

4.10 Master Auxiliary Sends ................................................................................. 13

4.11 Auxiliary Return............................................................................................. 13

4.12 PFL / Headphone Amplifier........................................................................... 13

4.13 Split Cue........................................................................................................ 13

4.14 PFL Output.................................................................................................... 14

4.15 Remote Music Mute ...................................................................................... 14

4.16 Emergency Signal Input................................................................................ 14

4.17 Mono/Sub-Bass Output................................................................................. 14

4.18 Sound to Light Output ................................................................................... 15

5 CZ1 Zone Module

5.01 Facilities ........................................................................................................ 17

5.02 Zone 1........................................................................................................... 17

5.03 Zone 2........................................................................................................... 17

5.04 Zone 3........................................................................................................... 17

5.05 Retro-fitting the CZ1...................................................................................... 17

................................................................................. 11

.................................................................................. 17

6 General

6.01 Recording from the CXM............................................................................... 19

6.02 Unbalanced Mode......................................................................................... 19

6.03 Earthing......................................................................................................... 19

7 Service and Configuration

7.01 Module Removal ........................................................................................... 20

7.02 Crossfade Replacement................................................................................ 20

...................................................................................................... 19

................................................................ 20

Diagrams

1.20 Panel Template and Cut-Out.......................................................................... 3

1.03 Power Supply Installation................................................................................ 4

2.16 CS1 Stereo Music Module Jumpers............................................................... 7

3.16 CM1 Microphone Module Jumpers............................................................... 10

4.17 M2 Jumper settings....................................................................................... 15

4.00 M2 Rear Panel Connections......................................................................... 16

4.28 CZ1 Zone Module ......................................................................................... 18

WARNING

This technical manual is intended as information and assistance for the technically qualified audio installation
engineer. Some of the data herein could be mis-interpreted by the end user with serious or even disastrous
consequences. For these reasons, this manual should not be left with the CXM mixer after installation, unless the
end user can prove his or her electronic qualification. A 'User's Guide' is provided for operator instruction.

 Cloud Electronics Ltd, Sheffield, England

CXM Technical

MANUAL

1 General Description

1.01 The Cloud CXM mixer is primarily designed for 'live' discotheque use, yet it is equipped
with such flexible facilities that it may successfully be used in a wide range of applications
such as broadcast and production studios.

The console has advanced specifications and rugged construction. Its compact
dimensions make effective use of limited space such as in DJ booths and small studios.

1.02 The main frame, complete with master module, is available in three sizes, with space for
8, 12, or 16 channel modules. Two different types of input channel modules are available,
one being specifically designed for music programme, the other with features to suit a
microphone input. A stylish angle mounting kit is supplied with the main frame. If desired
this can be discarded to allow flat panel mounting. The 8 module main frame can be 19"
rack mounted and occupies 9U of rack space. See figure 1 for template and cut-out
details.

117mm

OVERALL WIDTH: 8 MODULE - 520mm 12 MODULE - 677mm 16 MODULE - 834mm

3

20.00mm

473mm

NOTE: CLEARANCE OF 150mm BELOW THE MOUNTING LEVEL
SHOULD BE ALLOWED FOR ACCESS TO REAR PANEL CONNECTIONS

NOTE
THE ANGLED MOUNTING KIT CAN BE
SCREWED TO THE MOUNTING SURFACE

PANEL CUT-OUT WIDTH - 8 MODULE MIXER - 444.00mm

PANEL CUT-OUT WIDTH - 12 MODULE MIXER - 601.00mm

PANEL CUT-OUT WIDTH - 16 MODULE MIXER - 758.00mm

PANEL CUT-OUT

DEPTH

(ALL 3 TYPES)

410.00mm

43.00mm

1.03 The PSU 1040 power supply is designed to be surface mounted remotely from the mixer.
The main ± 17.5V DC power rails have a slow rise characteristic to reduce switch on
thumps. In addition, a separate ± 15V DC provides power for headphone amplifiers and
display drivers. Microphone phantom power is provided and can be configured to operate
from + 17.5V DC or + 48V DC. A mains input in the range 220 to 240 volts at 40 - 60 Hz
is required and a moulded mains lead is supplied with the unit. When a fused plug is
fitted, this should have a rating of 1A.

CXM Technical

MANUAL

The PSU 1040 can be modified to operate from a supply of 110 - 120V by removing the
internal link marked '240V' and fitting two adjacent links marked '110 - 120V'. The 220 ­240V fuse rating of T500mA should be changed to T1A for 110 - 120V operation.

Adequate ventilation must be provided to ensure safe and reliable operation of this power
supply. Remember that the PSU 1040 has a captive output lead, which is 900mm long,
this factor must be considered when positioning the PSU.

The mains earth connection to the PSU should be of the highest specification, not only for
audio quality but for the operator safety aspect, as many of the connected input sources
often rely on the audio mixer for their ground connections, e.g. turntables, microphones,
etc.

4

CXM Technical

MANUAL

CS1 Stereo Music Module

2.01 This module contains RIAA equalised phono and line level amplifiers, sub-sonic
filter, equaliser, auxiliary sends, channel fader, crossfade assign, mono switch,
PFL select logic and remote start switch. Inputs are by way of gold plated RCA
phono sockets.

2.02 Input Amplifier Equalisation
Two input amplifiers are fitted. The RIAA equalised phono input has an input
impedance of 47kΩ, loaded with a capacitance of 220pF. The RIAA equalisation
is accurate to within ± 0.5dB 30Hz-20kHz. This input amplifier can be configured
internally with a 3 position jumper. The 3 input options are:

INPUT OPTION DESCRIPTION
RIAA For moving magnet cartridges.
Flat response @ 0dBu For CD players and other ancillaries with outputs

compatible with an input range of-12dBu to
+12dBu

Flat response @ -10dBu For low output ancillaries requiring an input range

of -22dBu to +2dBu. If this option is selected,
consider the possible risk of overload with
incorrect gain settings.

5

2.03 Input Specification
The line amplifier is unbalanced with an input impedance of 47kΩ and a nominal
input sensitivity of 0dBu.

2.04 Input Gain
The gain range for both input amplifiers is trimmed to ±12dB with reference to
the centre (unity gain) point of the gain control.

2.05 Input Select
The input select switch is positioned at the top of the module with LED status
indication. A provision to mark the fascia with input source details is adjacent.

2.06 Sub-Sonic Filter
A permanent sub-sonic filter attenuates signals below 20Hz at a rate of
18dB/oct. This filter is positioned pre-equalisation thus preventing sub-sonic
signals being boosted by the bass control.

2.07 Equalisation
The equaliser has 3 bands, each band having a defined range resulting in a
controlled response outside the audio spectrum. In addition, the range of boost
and cut can be internally configured to operate at ± 12dB or limited to ± 6dB by
simply reversing a single circuit jumper. A second jumper can be used to bypass
the equalisation (see drawing).

The HF control operates at 10kHz, mid at 1200Hz and LF at 50Hz, all 3 controls
have a centre detent for positive neutral setting.
Factory default settings are ± 6dB with equalisation in circuit.

CXM Technical

MANUAL

2.08 Stereo/mono
A mono switch is included and this simply links the two stereo signals, the
adjacent LED illuminates when the signals are linked.

2.09 Crossfade Assignment
Two crossfade assign switches are provided; with both switch A and switch B in
the off position, stereo signals are routed to bypass the crossfade circuitry.
Switch A routes signals to channel A and similarly switch B to channel B;
adjacent LED's indicate the selected channel. The switches are arranged to give
priority to channel A necessitating the release of channel A prior to selecting
channel B. (See 4.01 and 4.02 for details of crossfade and chopfade on master
module).

2.10 Auxiliary Sends
Two auxiliary sends are provided and can be individually configured to operate
in the pre-fade or post-fade mode by simply reversing a single circuit jumper
(see detail). This facility can be used to interface a variety of units for signal
processing, sampling, digital effects or as a flexible extra output facility. Factory
settings configure Aux 1 pre-fade and Aux 2 post-fade.

6

2.11 Balance Control
The balance control operates at -3dB at centre to infinity at extremes, with a
centre detent to aid positive positioning.

2.12 PFL (Pre Fade Listen)
This logic controlled momentary action switch routes the pre-fade signals to the
headphone amplifier and lower stereo LED bargraph display. The selection of a
channel PFL automatically cancels any prior selection. The adjacent LED
indicates status.

2.13 Peak LED
A red LED indicates the peak signal level at the pre-fade point and illuminates at
a level of approximately 4dB below clipping.

2.14 Channel Fader
The channel fader has a slide length of 100mm and an exceptionally smooth
feel. Under normal operating conditions, the fader is used fully open or fully off.

2.15 Remote start switch
A low voltage, fully floating, momentary action switch is fitted as standard. The
contact rating is 30V at 0.1A and is terminated with a 2 pole 3.5mm jack socket.
A latching action switch is available as an option.