Manual - Cloud
Contents
1. Factory Default Jumper Settings JUMPER FUNCTION SETTINGS DEFAULT OFF no phantom power MIC phantom power ON 15V phantom power OFF no phantom power MIC 2 phantom power ON 15V phantom power 3S 3 secs release time L6 priority release time 6S 6 secs release time OFF 12 secs release time MONO L amp R music inputs are summed Mono stereo operation STEREO normal operation m OFF no priority normal operation J5 A amp B L6 priority left amp right 16 has priority when active JUMPER MIC always active MIC access bypass NO JUMPER use MI access port to activate MIC JUMPER MIC 2 always active MIC 2 access bypass NO JUMPER use M2 access port to activate MIC 2 SEL Aux MOH output follows music source selection MOH source select 5 L2 Aux MOH output is always LINE 2 NO external contact closure required for mute Music Mute configuration NC external contact opening required for mute MIC N OFF Mics have equal priority over riori 4 ON MIC has priority over MIC 2 MP AVO MIC I priority triggered by announcement VOX MIC priority trigger AVO ACC MIC priority triggered by contact closure 22 AVO MIC 2 priority triggered by announcement VOX MIC 2 priority trigger 5 ACC MIC 2 priority triggered by contact closure STEP OFF music remains during announcement Mic over music priority ON music ducks during announcement FR permits fron2. be adjusted with a test call from the telephone system Note that the front panel MIC LEVEL control is still operational Main Outputs The main LEFT and RIGHT outputs on the 2 are electronically balanced and can operate into loads down to 1 2 kO The nominal output level is 0 dBu 775 mV but the mixer can drive a maximum output level of 20 dBu 7 75V_ rms Connectivity The outputs are on rear panel 3 pin 3 5 mm pitch screw terminal connectors on fig 3 For balanced connections 2 core screened cable should be used Connect as shown below CX261 balanced output Balanced input e g XLR pin 1 ground pin 1 ground pin 2 cold pin 2 hot pin 3 hot pin 3 cold fig 8 Balanced output wiring Unbalanced connection may be used if necessary but its use is recommended only between pieces of equipment in the same rack Unbalanced signals should not be run over long distances An unbalanced output connection should be wired as shown below CX261 balanced output pin 1 ground pin 2 cold pin 3 hot Unbalanced input e g phono fig 9 Unbalanced output wiring Note that pin 2 of the output connector is not used Cioua Auxiliary MOH Output The MOH Music On Hold or auxiliary output provides a transformer isolated mono sum of the music channel This is intended to provide a continuous music feed for use with a telephone system If it is not required for this it m
3. ground is provided Ventilation The CX26 generates very little heat in normal operation and is cooled by natural convection However note that there are ventilation holes on the bottom cover and these should never be covered or obstructed Installation in an equipment rack is always recommended but care should be taken not to mount the unit immediately above another item of equipment as this will block the ventilation holes If the unit is to be used free standing stick on rubber feet should be attached to the bottom plate to ensure clearance from the surface the unit sits on CX261 User Manual v1 3 13 Technical Specifications Line Inputs lt 0 05 typical kHz MP3 Input 20 Hz 20 kHz 0 5 dB lt 0 05 kHz Microphone Inputs 20 Hz 22 kHz lt 0 05 Noise lt 125 dB EIN 20 Hz 22 kHz 150 Tel Input lt 0 05 200 Hz 20 kHz Outputs Ost Lee Minimum Load Impedance 1 2 600 Q Maximum Output Level 20 dBu 14 CX261 User Manual v1 3 General Specifications UU 120 465 mA Dimensions mm W x H x D 482 6 x 44 IU x 152 5 Weight kg 2 13 Location of Internal Jumpers and Connectors SUB BOARD BOSE EQ MODULE CONNECTOR RIGHT CHANNEL BOSE EQ MODULE 16 CONNECTOR LEFT CHANNEL FRONT OF UNIT fig 12 Jumper and connector details CX261 User Manual v1 3 15 __
4. CX261 MP3 ZONE MIXER ee Aie o AR 1 MS Se Installation and User Guide Safety Information ss 4 General Specifications 15 Safety Notes Regarding Installation 4 Location of Internal Jumpers and CORRE ACAD cU KU EE 4 Connector 15 Safety Considerations and Information 4 Factory Default Jumper Settings 16 General 5 NOTES 17 Schematic Diagram 5 Front Panel Description 6 Rear Panel Description 6 Mu sic u 7 Sensitivity and Gain Control rere 7 Music Source Select and Level 7 Remote Control of Music Source and 7 Mono Operation aceptar bann bal ad rU RAO 7 Music Egualisation einen 7 Music Limiter 8 MUSIC Priori nes 8 Front panel 8 Microphone Inputs arra anneau 9 9 Microphone Level Controls 9 Gain PEN 9 Microphone Equalisation i 9 Microphone Limiter 9 Microphone Access 9 Microphone PEIOPI IGS aerei 10
5. ED on the front panel fig 2 illuminates to confirm the selection When the input is selected the music source connected to LI will no longer be available To allow for the wide range of signal levels which may be encountered from portable audio devices the MP3 input is provided with its own level control and signal level LEDs respectively on fig 2 The range of sensitivity adjustment is from 20 dBu with the control fully clockwise at 20 to 4 dBu with the control fully anticlockwise at 4 Three LEDs on fig 2 are fitted to the front panel to aid level adjustment The LEDs illuminate at the levels shown in the table LED Red de With an MP3 player or other source connected to the MP3 input and playing and the MP3 input selected the level control should be adjusted so that the green and yellow LEDs are on more or less continuously and the red LED only on during the louder passages Microphone Inputs Two microphone inputs are provided the microphone pre amplifiers are an electronically balanced transformer less design configured for optimum low noise performance The input impedance is greater than 2 and is suitable for microphones in the 200 to 600 range 15 V phantom power is available on either or both mic inputs for powering condenser mics and is activated by setting internal jumpers and J2 for mic inputs and 2 respectively to the ON p
6. Microphone Over Music Priority 10 Mic Over Mic 2 Priority 10 Use of Mic input with telephone system 10 Main Outputs ooi minare p VE EYE 11 aique bip dito oan dt orare iudi Auxiliary MOH lI Source SEIBEU Music Mute Fire Alarm Interface 12 Bose Equalisation Modules 12 Installation Instructions 3 4 12 General Notes 13 EMC Considerations scene 13 Ear 13 ys cinta id 13 Technical Specifications 14 CX261 User Manual v1 3 3 __ Safety Information Safety Notes Regarding Installation Do not expose the unit to water or moisture Do not expose the unit to naked flames Do not block or restrict any air vent Do not operate the unit in ambient temperatures above 35 C Do not touch any part or terminal carrying the hazardous live symbol while power is supplied to the unit Do not perform any internal adjustments unless you are qualified to do so and fully understand the hazards associated with mains operated equipment The unit has user serviceable parts Refer servicing to qualified service personnel f the moulded plug is cut off the AC power lead for any reason the discarded plug is a potential haza
7. UTS balanced L amp R outputs MATE CONTACTE OHR fig 3 261 Rear panel Rear Panel Description MOH OUTPUT balanced auxiliary output use 12 GAIN to 6 gain trims for each line input with MOH systems LF amp HF MUSIC EQ low and high frequency EQ LEVEL level control for MOH output djustment ic ch pc M E ACCESS external paging control inputs for MIC LINE 1 MP3 replaces LINEI RCA connectors with and MIC 2 fi i REMOTE MUSIC CONTROL for connection of 6 MIC 1 and MIC 2 balanced mic inputs RL I RSL 6 remote control panels GAIN and GAIN 2 gain trims for each mic input LOCIREM disables front panel controls when LF amp HF MIC EQ low and high frequency EQ remote control is in use adjustment for mic channel 0 MUSIC MUTE Emergency control input for muting Q MIC LEDs bicolour LEDs to aid mic level musie source adjustment IEC mains input MIC TEL reconfigures MIC input for use with Mains fuse telephone system 6 CX261 User Manual v1 3 Music Inputs The unit has six stereo line inputs these inputs are suitable for most music sources such as compact disc players tape players satellite receivers and the like If connecting a mono music source both L and R inputs should be wired in parallel the exception being when using the 261 in mono m
8. always automatically replace any previously selected programme for its duration Music Priority is set by moving internal jumpers J5A and J5B from OFF to ON See page 15 for location of internal jumpers The factory default restoration time is 3 seconds This may be too short in some cases for example if a jukebox was to take more than 3 seconds between the end of one track and the start of the next In such a case longer restoration times of 6 or 12 seconds may be set to ensure that the CX261 does not revert back to the selected music source in between tracks Restoration time is set by internal jumper J3 Moving the jumper position on the 3 pin header changes the restoration time from 3 to 6 s removing the jumper altogether sets a time of 12 5 As well as the main outputs Music Priority also applies to the auxiliary MOH output when its source is set to follow the front panel selection see page Auxiliary MOH Output 8 CX261 User Manual v1 3 Front panel MP3 input To facilitate easy connection of digital audio devices such as portable MP3 players or laptop computers a 3 5 mm stereo jack socket is provided on the 261 front panel 0 fig 2 This input replaces Line input and will only operate if the MUSIC SOURCE switch is set to LI MP3 The front panel jack socket is selected instead of the LI phono sockets by setting the LINE I MP3 switch on the rear panel on fig 3 MP3 A green L
9. ay be used as a auxiliary mono output for another suitable purpose However it should be noted that a fixed LF filter reduces bass frequencies at this output to optimise it for use with telephone systems The microphone inputs are not mixed into this output so that internal paging announcements are not heard by telephone callers This fact should be borne in mind if the output is used for some other purpose The output is a 3 pin 3 5 mm pitch screw terminal connector on the rear panel on fig 3 The output level is 6 dBu nominal and is suitable for driving 600 Q loads The output is transformer coupled to provide full galvanic isolation from a telephone system Because of this pin 2 cold must always be connected The wiring convention shown in fig 8 for connection to a balanced input may be followed but if wiring to an unbalanced input the convention shown below should be followed CX261 MOH Aux output pin 1 ground pin 2 cold pin 3 hot Unbalanced input e g phono SCN fig 10 Unbalanced MOH output wiring The signal level at the auxiliary MOH output can be set independently via the rear panel preset MOH LEVEL control on fig 3 The output level is zero with the control fully anticlockwise Note that the signal at this output is NOT altered by the front panel MUSIC LEVEL control or the rear panel MUSIC EQ preset adjustments Source Selection If the output is to be used as an auxiliary mon
10. connect the power cable from the unit before removing the top panel and do not make any internal adjustments with the unit powered on Only reassemble the unit using bolts screws identical to the original parts General Description The Cloud 261 is a IU rack mounting stereo audio mixer intended for use in multi use areas where simple control of high quality background music needs to be combined with a flexible range of paging options The 261 mixes any one of six stereo line inputs with one or two microphone inputs Separate controls for music and mic levels are provided and music source selection and level may be controlled remotely if wished As well as the main output there is a transformer isolated mono auxiliary output which is suitable for providing MOH Music On Hold output to a telephone system Schematic Diagram Cloud The mixer may be configured to operate with most paging systems either mic input may be activated by voice VOX or short to ground access connections MIC may have priority over MIC 2 one line input may have priority over any other selected to facilitate connection of a digital sound store or similar device A front panel 3 5 mm jack input permits easy connection of a portable MP3 player laptop or similar with independent level control A switchable isolating transformer configures MIC input for direct connection to a telephone system enabling paging messages to originate from an ext
11. e installed loudspeakers The limiter has no external controls If the music input gain and level controls are set correctly the limiter action should be inaudible on normal programme material with no compression artefacts The threshold of the music limiter is factory set at 0 dBu thus signal peaks above this level will be limited A higher threshold of 6 dBu can be set by moving internal jumper 15 see page 15 for jumper location this will give improved fidelity and may be appropriate if the installer is confident about the dynamic range of the programme material If there is dynamics control elsewhere in the system e g in the form of an external compressor limiter or within a DSP based unit or if limiting is considered undesirable the limiter may be by passed by removing 15 from the PCB header and leaving the links open Music Priority Line input 6 can be set to have priority over other music inputs When set the CX261 will automatically switch the music source to Line 6 when the signal level at Line 6 input exceeds 30 dBu approx The input set by the source selection switch is temporarily deselected until the signal at Line 6 input stops Then it resumes smoothly increasing in level to its former volume The restoration time is selectable options are 3 6 or 12 seconds This facility is useful with sources such as spot announcement players jukeboxes digital sound stores or similar as audio from these sources will
12. ension Bose EQ cards may be fitted to either or both channels RIGHT STEREO CHANNEL SHOWN LEFT STEREO CHANNEL OMITTED FOR CLARITY ACCESS CONTACTS 23 SIGNAL INDICATOR J8 MOH SEL LINE 1 MP3 BTE 6 E ES Era J5A B 10 1 CX261 schematic diagram J15 LIMITER 9 e THRESHOLD TO LEFT CHANNEL gom 3 Ps MODULE 1 REMOTE RSL 6 6 6 6 J9 NO NC wu 1 OPTIONAL OUTPUT MUSIC MUTE CX261 User Manual v1 3 5 261 ME en Mon x sis 20 X E fig 2 CX261 Front panel Front Panel Description MUSIC SOURCE selects one of Music inputs SIGNAL INDICATOR 3 LEDs green yellow red LI to 6 indicating level of MP3 input MUSIC LEVEL adjusts level of selected Music input MIC 1 LEVEL adjusts level of Mic input LOCAL REMOTE LED indicates green when MIC 2 LEVEL adjusts level of Mic input 2 PENTE MUSIC MUTE indicates red when external Music MP3 IN 3 5 mm stereo jack socket for connection Mute is active of non permanent external source POWER Power LED o MP3 GAIN adjusts gain of the MP3 input LINE 1 LED indicates green when the MP3 input is enabled 9x EATING POWER U 40 60Hz 46 5mA 110 240 s10 _ w TEL GAIN MIC input gain adjustment in TEL mode LINE to LINE 6 stereo line inputs for music MAIN OUTP
13. l connector on the rear panel The input is usually connected to a pair of isolated relay contacts activated by the fire system Note that the Music Mute function only mutes the 2615 main outputs the auxiliary MOH output remains active Activation of the Music Mute is often via a relay mounted close to the CX261 and its associated amplifiers powered by the fire alarm control panel Other arrangements may exist depending on the design of the fire control system and the fire alarm installation company should be consulted when making the connection The CX261 will mute on either a contact closure at the Music Mute input NO or an open circuit NC Selection of or NC operation is made with internal jumper J9 NO is the factory default See page 15 for details of jumper location The diagram below shows the two connections MUSIC MUTE INPUT MUSIC MUTE INPUT 08 I L NORMALLY OPEN CONNECTION NORMALLY CLOSED NC CONNECTION fig 1 Remote music mute terminations Bose Equalisation Modules The 261 is compatible with single channel Bose Series equalisation modules EQ modules are available to suit the following Bose loudspeakers Panaray MAI2 Panaray 402 1 502B and 502BEX Panaray LT Series Models 3302 4402 9402 and 9702 Modules to suit other models are availab
14. le please enquire 12 CX261 User Manual v1 3 Installation Instructions Refer to the PCB layout diagram see page 15 for the location of the Bose EQ module connectors Note that there are two connectors one per main output LEFT and RIGHT There is no provision for fitting an equalisation module to the auxiliary MOH output To install an EQ module proceed as follows solate the unit from the mains Remove the top panel Plug the Bose equalisation module onto its connector note that the connector has two notches on one side which engage with lugs on the module s mating connector to ensure correct orientation Replace the top panel General Notes EMC Considerations The CX261 fully conforms to the relevant electromagnetic compatibility EMC standards and is technically well behaved You should experience no problems interfacing units to other items of equipment and under normal circumstances no special precautions need to be taken If the unit is to be used in close proximity to potential sources of HF disturbance such as high power communication transmitters radar stations and the like it is suggested that input signal leads be kept as short as possible Always use balanced interconnections wherever possible If the CX261 is mounted in a 19 rack do not locate the unit in close proximity to a powerful amplifier of any kind which may radiate a strong magnetic field from the power transforme
15. n to the ON See page 15 for location of internal jumpers Then if Mic I is already making an announcement Mic 2 will not be able to access the system Also if Mic 2 is making an announcement and Mic then becomes active Mic 25 announcement will be curtailed and Mic 15 will take over Use of Mic 1 input with telephone system input on the CX261 may be reconfigured to accept an audio input directly from a compatible telephone system This permits announcements to be made from some or any internal telephone extensions in a building Not all telephone systems are suitable for this application and the system documentation should be consulted in detail to ensure compatibility 10 CX261 User Manual v1 3 The MIC TEL button on the rear panel on fig 3 should be in the TEL position in for this application This inserts a transformer in series with the input connector to provide full electrical isolation from the telephone system together with an independent gain control stage The audio or paging output of the phone system should be connected to the MIC input in the normal way The impedance of the telephone input is 600 Q this should be suitable for the majority of telephone systems If the telephone system requires a high input impedance internal jumper 16 may be removed to provide an input impedance of 48 See page 15 for location of internal jumpers The TEL GAIN preset gain control D on fig 3 should
16. o feed it will generally need to follow the normal music source selection This is the factory default configuration If Music Priority is enabled see page 8 Music Priority the auxiliary MOH output will switch to Line 6 along with the main outputs if the input becomes active However when in use as an MOH source it is generally more desirable for the music source typically a CD jukebox or music server to remain constant and not vary with the front panel MUSIC SOURCE control For this purpose the source for the auxiliary MOH output can be altered by moving internal jumper 8 from SEL to LINE 2 The music source that is intended to provide the Music On Hold programme should be connected to LINE 2 See page 15 for location of the internal jumper CX261 User Manual v1 3 11 __ Cloud In either case no microphone signals are present at the auxiliary MOH output thus announcements made via the microphone inputs do NOT interrupt music programme at this output regardless of any priority settings Music Mute Fire Alarm Interface In some installations such as licensed premises or retail outlets within a shopping mall there may be a local authority or fire service requirement to mute the music signals from a fire alarm control panel when an alarm condition arises The CX261 includes facility to mute the music programme only i e mic inputs are still active via the Music Mute input This is a 2 pin 5 mm pitch screw termina
17. ode see page 7 Mono Operation All inputs are unbalanced and use RCA phono sockets The input impedance is 48 kQ Line 6 input can be configured to have priority over any other music source see Music Priority on page 8 Line 15 rear panel input can be disabled in favour of the front panel MP3 input see Front panel MP3 input on page 8 Sensitivity and Gain Control All six stereo line inputs have a pre set gain control on the rear panel adjacent to the respective input sockets The gain control has a range of 24 dB allowing the input sensitivity to be varied from 12 dBu 200 mV to 12 dBu 3 1 V The pre set gain controls should be set so that all the input signals are operating at the same level and that the front panel level control has an optimum range of control Music Source Select and Level Front panel controls are provided for Music source selection and level control A six position rotary switch selects one of Line I LI to Line 6 L6 The first position will select either the Line RCA socket or the MP3 jack socket depending on the position of the LINE I MP3 switch rear panel item See Front panel MP3 input on page 8 for more details The rotary level control adjusts the level of the selected music source Full anticlockwise rotation reduces the output level to zero Remote Control of Music Source and Level The 261 is compatible with the Cloud RSL 6 and RL I remote control wallplates permitting contr
18. ol of music level RL 1 or music level and source selection RSL 6 from a remote location The wallplates fit a standard UK single gang back box of 25 mm depth Either type of plate may be connected at the rear panel RSL 6 3 pin 5 mm pitch screw terminal connector see on fig 3 using the wiring shown in figs 4 and 5 RSL 6 CONNECTOR SINGLE CORE SCREENED CABLE MAY BE USED fig 4 Remote level control wiring RSL 6 or RL 1 USE TWO CORE SCREENED CABLE fig 5 Remote source and level control wiring Use two core RSL 6 or RL 1 or single core RL I only screened cable to connect the remote level plate max length 100 metres Pressing the LOC REM button adjacent to the rear panel connector activates the remote control plate and disables both the front panel level and source select controls Confirmation of REM selection is given by a green front panel LED e on fig 2 If an RL I is being used the internal jumper JI 4 should be moved from its default SW setting to FR to override the disabling of the front panel source select switch See page 15 for location of jumpers Versions of the remote control wallplates suitable for single gang US electrical outlet boxes are also available designated RSL 6A and RL 1A Front panel dimensions 4 2 x 27A Their operation is identical to that of the European versions Mono Operation The 261 is a 2 channel device and is intended
19. ophone distortion does not occur even when the front panel MIC LEVEL controls are fully clockwise Microphone Equalisation The microphone input stages each incorporate a fixed high pass filter The filter attenuates signals below 100 Hz which helps to reduce the effects of microphone handling noise The mic inputs are then summed together and mixed with the music channel priority settings permitting via an adjustable EQ section The two pre set EQ controls 9 on fig 3 are on the rear panel adjacent to the music EQ controls the LF and HF controls provide 10 dB of adjustment below 100 Hz and above 5 kHz respectively After installation some test announcements should be made ideally by the people who will normally make them The Mic EQ should be adjusted if necessary to maximise voice clarity Microphone Limiter The microphone channel incorporates a limiter circuit to prevent amplifier and speaker overloading and also to help maintain more constant speech volume when the system is used by different announcers The limiter is set to restrict the mic signals to a nominal 0 dBu and if the mic gain and level are set correctly should be inaudible in operation on normal speech There are no internal or external controls Microphone Access Input Access control for both microphone inputs is provided to allow the 261 to be interfaced to single zone paging mics such as the Cloud 1 access contacts work on the short to gro
20. osition See page 15 for location of jumpers Care should be taken to ensure that phantom power is activated only when the microphone connected to the input requires external phantom power damage to the microphone may result otherwise Mic input may be configured for use with a telephone system See page 10 for more details Connectivity Inputs are via 3 pin 3 5 mm pitch screw terminal connectors on the rear panel on fig 3 Connect microphones as shown below Note that if using an unbalanced microphone pins and 2 should be connected together MIC INPUTS Pin 1 Screen Ground Pin 2 Cold Antiphase Pin 3 Hot Phase BALANCED CONNECTION UNBALANCED CONNECTION fig 6 Input wiring for microphones Microphone Level Controls A separate front panel level control on fig 2 is provided for each mic input and these provide the user with a convenient means of adjusting the audio level of the microphones The mic levels are unaffected by the operation of the music level music mute and remote music level controls if fitted Gain Control A preset mic gain control is provided adjacent to each input connector on fig 3 this adjusts the mic pre amp gain in the range 10 dB to 50 dB A high overload margin is maintained at all gain settings and a limiter circuit is always active see Microphone Limiter on this page Nevertheless the gain controls should be set during installation so that micr
21. r Earthing When several mains powered units are connected together via their signal cables there is a risk of one or more earth loops which may cause an audible hum on the system even with the gain controls set to minimum The OV rail of the CX261 is directly coupled to the chassis ground No interconnection problems should be encountered but if there is any hum or other extraneous noise when source equipment is connected the situation can generally be remedied by observing the following guidelines Always connect the microphone inputs using balanced connections wherever possible with the cable screen only connected at the mixer input Always connect the mixer outputs using balanced connections wherever possible with the cable screen only connected at the destination normally an amplifier input Use audio isolating transformers readily available from trade suppliers at the inputs and or outputs if necessary These will ensure that the mixer is electrically isolated from other equipment Both signal source units and amplifiers should be located as close as possible to the mixer and the metal housing of the various units should not be electrically connected together through the equipment rack If this is a problem rack isolating kits are available from specialist hardware suppliers If the problem persists try to connect all interconnected units including power amplifiers to a common power source to ensure a common
22. rd and should be disposed of in a responsible manner Conformities This product conforms to the following European EMC Standards BS EN 55103 1 1997 BS EN 55103 2 1997 This product has been tested for use in commercial and light industrial environments If the unit is used in controlled EMC environments the urban outdoors heavy industrial environments or close to railways transmitters overhead power lines etc the performance of the unit may be degraded The product conforms to the following European electrical safety standard BS EN 60065 2002 The CX range was developed and manufactured with high quality materials and components which can be recycled and or reused 4 CX261 User Manual v1 3 Safety Considerations and Information The unit must be earthed Ensure that the mains power supply provides an effective earth connection using a three wire termination Caution High Voltages Do not touch any part or terminal carrying the hazardous live symbol 4 while power is supplied to the unit Terminals to which the hazardous live symbol refers require installation by a qualified person Caution Mains Fuse Replace the mains fuse only with the same type and rating as marked on the rear panel The fuse body size is 20 mm x 5 mm Caution Servicing The unit contains no user serviceable parts Refer servicing to qualified service personnel Do not perform servicing unless you are qualified to do so Dis
23. shed See page 15 for location of the jumpers The factory default is for both mic inputs to be set to AVO Automatic Voice Over In this mode the priority circuit is triggered by the presence of a microphone signal in the zone The alternative ACC jumper setting triggers the priority by contact closure when the access contacts are enabled ACC priority should only be selected when a suitable paging microphone is used Note that priority detection may be disabled by removing J11 12 In this state the mic channels will still operate normally but music programme will remain at full level and the two mic inputs will be mixed together if both are active simultaneously Microphone Over Music Priority The priority circuitry is configured at the factory to duck the music programme reduce its level when an announcement is made At the completion of the announcement after a delay of second the music ramps back up to its original level over a period of second The ducking action can be overridden by moving internal jumper 13 from the ON position to the OFF See page 15 for location of internal jumpers Mic Over Mic 2 Priority In installations where both mic inputs are being used it is possible for announcements to clash if the mics are active simultaneously By default the CX261 allows both microphones to access the system simultaneously Mic may be given priority over Mic 2 by moving internal jumper 10 from the OFF positio
24. t panel source selection in REM mode REM mode source selection SW SW front panel source selection disabled in REM mode OdBu music level limited to 0 dBu Music limiter threshold OdBu 6dBu music level limited to 6 dBu JUMPER Z 6000 TEL input impedance In NO JUMPER Z 48 15 and J5B must always have the same setting 16 CX261 User Manual v1 3 Notes CX261 User Manual v1 3 17 CX261 User Manual v1 3 Bose is a registered trademark of The Bose Corporation In the interest of continuing improvements Cloud Electronics Limited reserves the right to alter specifications without prior notice CX261 User Manual v1 3 19 22122 1 Diii Cloud Electronics Limited 140 Staniforth Road Sheffield S9 3HF England Tel 44 0 114 244 7051 Fax 44 0 114 242 5462 email info cloud co uk web www cloud co uk
25. to be used where full stereo reproduction of music sources is desirable If the installation does not require full stereo operation which will generally be dictated by room layout and loudspeaker placement mono mode should be selected Mono mode is enabled by moving internal jumper J4 from STEREO to MONO In mono mode the two LEFT and RIGHT main outputs will carry identical programme at the same level Either or both may be used as wished Note that stereo music sources should still be connected to both L and R line inputs in the normal way However when mono operation is enabled any mono music sources may be connected to either L or R only Music Equalisation HF and LF equalisation for the music channel is provided via pre set controls on the rear panel on fig 3 This permits the installer to adjust the frequency response to suit the particular acoustics and speaker types in the zone The EQ adjustment is post the music source selection and thus is effective on all sources The controls are simple shelving filters providing 10 dB of cut or boost above 10 kHz HF control and below 50 Hz LF control Note that a flat frequency response is obtained when the two controls are in their mid positions CX261 User Manual v1 3 7 ___ Cioua Music Limiter The music channel of the CX261 incorporates a limiter circuit to help prevent inadvertent overloading of subsequent power amplifier input stages and ultimately th
26. und system which is compatible with the majority of paging microphones The CX261 is shipped with the access control input disabled for both microphone inputs This allows immediate use with standard microphones not fitted with PTT Press to Talk switches If external access control is required the internal jumpers J6 Mic I and J7 Mic 2 must first be removed See page 15 for location of the jumpers The access control input is a 3 pin 5 mm pitch screw terminal connector on the rear panel on fig 3 Mic input becomes active when MI is connected to OV Mic input 2 becomes active when M2 is connected to OV Part of external paging mics Activate Mic input 2 OV M1 M2 Access contacts fig 7 Input wiring for microphones See also the following section Microphone Priority for further information on the use of the CX261 with paging microphones CX261 User Manual v1 3 9 __ Microphone Priorities The microphone inputs on the CX261 may be configured so that when they are in use they take priority over the music programme additionally Mic input may be set to take priority over Mic input 2 There are two methods of triggering the microphone priority circuitry signal detection AVO or via the zone access contacts on the rear panel ACC The choice is made by internal jumpers JI Mic input 1 and J12 Mic input 2 note the two mic inputs may be set differently if wi
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