Manual - Cloud
Contents
1. ey POWER OUTPUT PASS LIMITER EH SOCKET AMPLIFIER MIN LOAD Access BYPASS FILTER L 11 OE ker T 2 V y ov ov MIC 1 ACCESS 1 GAIN 4 5 TRIGGERS LINE OUTPUT 15V TRANSFORMER 1 MIC 1 CHIME POWER ACCESS 100V 70V 50V E Le MIC 1 OVER a MIC 2 384 LINE 1 GUN el PRIORITY AUTO VOICE OVER Fell l 15V LI Power LINE 2 me PASS LIMITER He MUSIC br EQ FORCE FRONT PANEL FRONT PANEL er SOURCE SELECT MUSIC SOURCE AND LEVEL nsv LINE 4 e CONTROLS 1 PHANTOM u OWER 9 pI T oe al MIC4 e E REMOTE Ed e LEVEL E ye I LINE 6 e gt CONNECTOR lt 15V 91 3s RELEASE TIME PHANTOM S 6s 123 NO JUMPER FRONT PANEL REMOTE SWITCH RSL 6 OPTIONAL REMOTE SOURCE AND LEVEL ON OFF fig 1 MPA Series Schematic Diagram MPA Series User Manual 1 2 5 MUSIC LEVEL 240 INTEGRATED MIXER AMPLIFIER MUSIC SOU GE fig 2 MPA Front Panel Front Panel Description MIC LEVEL I to 4 level controls for Mic Inputs PEAK illuminates if Mic or Line signals level are2. amp 8 Microphone 9 Microphone over music priority 9 Mic over Mics 2 4 priority 9 ep P 9 Power Amplifier Stage and Outputs 9 A elim unii ndi 9 Low impedance operation eetk eerte 9 High pass nee 10 Music Mute Fire Alarm Interface 10 Bose Equalisation Modules 10 Installation Instructions uses 10 Series User Manual 1 2 3 _ Cloud 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 359C Do not touch any part or terminal carrying the hazardous live symbol y 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 no user serviceable parts Refer servicing to qualified service personnel f the moulded plug is cut off the mains lead for any reason the discarded plug is a potential hazard and should be disposed of in a responsible manner For more detailed information refer to the rear of the manual Safety Notes Conformities This
3. i mmi MIXER AMPLIFIER MPA SERIES IMILP N 2340 oc lt gt a 5 2 ul E Installation and User Guide Safety Information 2 2 4 General Notes esse esse ses sd anao ss ek nk dig lI Safety Notes regarding Installation 4 Multi zone Applications E 4 EMC Considerations aia E A I Safety Considerations and Information Fu 4 i Ventilati n cuina is Caution High Caution Mains Fuse EE ie 4 Technical Specifications 12 CASIO SERVICIO iret UR 4 Location of internal jumpers etc 13 General Description 0000000 0000000000000 000000 5 Factory Default Jumper Settings aM M dde 13 Schematic Diagram 2 11 4 4 400 5 Front Panel Description 6 Rear Panel Description 6 Music Inputs sooo 7 Sensitivity amp Gain 7 Music Source Select se men atate 7 Music Level Santa 7 Remote Control of Music Source 7 Select antl cidad 7 Music Equalisation au scene 8 Music Priority seen 8 Microphone Inputs 0 ern 8 Gain Camtrel ee 8 Microphone Access Input 8 Front Panel Microphone Level Controls 8 Microphone
4. e sb A De r can 2 access 1231 23 om 123 dv FUSE REPLACE FUSE WITH SAME TYPE AND RATING AUSCMUTE Low MPEDANCE use TAH FUSE gt OUTPUT 100 115 USE T2A H FUSE Et fA o 6 96 6 fig 3 MPA Rear Panel Rear Panel Description LINE 1 to LINE 6 stereo line inputs for music LINE OUTPUT for connection of 100 V sources 70 25 line distribution system 1 to 6 level trims for each line input MUSIC MUTE Emergency control input for muting MUSIC EQ LF and HF EQ adjustment for music music source channel REMOTE MUSIC CONTROL for connection of MIC 1 to MIC 4 balanced inputs or RSL 6 remote control panels 6 GAIN 1 to GAIN 4 level trims for each mic input REMOTE LOCAL disables front panel controls when remote control is in use MIC EQ LF and HF EQ adjustment for mic channel IEC mains input Q ACCESS external paging control input for Mains fuse Mic LOW IMPEDANCE OUTPUT speaker output for low Z connection Fan forced air cooling air exhaust 6 MPA Series User Manual v1 2 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 Each stereo input is summe
5. Level Controls A separate level control is provided for each mic input and these provide the user with a convenient means of adjusting the audio level of the microphones The microphone signals are routed directly to the power stage and are unaffected by the operation of the music level control The gain controls on the rear panel see Gain Control should be set at a level where microphone distortion does not occur even when the front panel level controls are fully clockwise Microphone Equalisation The four microphone inputs are summed together and are routed to the power stage via a fixed high pass filter and an adjustable EQ section The fixed filter attenuates the signal below 100 Hz which helps to reduce the effects of microphone handling noise The two preset EQ controls are on the rear panel adjacent to the mic inputs 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 Priority MPA Series mixer amplifiers provide two separate microphone priority functions One of these enables the microphones to have priority over music the other allows Mic to have priority over the other microphones Microphone over music priority Fully automatic voice operated priority VOX function is availab
6. 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 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 MPA Series was developed and manufactured with high quality materials and components which can be recycled and or reused The WEEE symbol indicates that electrical and electronic equipment must be disposed of separately from normal waste at the end of its operational lifetime Please dispose of this product by taking it to your local collection point or recycling centre 4 MPA Series User Manual 1 2 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 When the mains switch is in the off O position the live and neutral conductors of the mains transformer are disconnected Caution High Voltages Do not touch any part or terminal carrying the hazardous live symbol while power is supplied to the unit Terminals to which the hazardous live symbol refers require installation by a qualified person Cau
7. too to 4 high e MUSIC SOURCE selects active Line Input o MUSIC MUTE illuminates when external 1 to 6 Emergency Mute is active MUSIC LEVEL adjusts level of selected Line Input MAINS power switch with LED Ventilation slots forced air cooling air intake ch y Se E L UINE INPUTS z SPEAKER OUTPUTS CLOUD ELECTRONICS LTD MADE IN PR LINE 1 LINE2 LINE 3 LINE 4 LINES LINE 6 INTERNALLY FOR EITHER LINE OUTPUT RATING Son 140 STANIFORTH ROAD OUTPUT OR LOW IMPEDANCE Ont OUTPUT SHEFFIELD 89 3HF ENGLAND R R R R R BOTH OF THESE OUTPUTS ARE NOT LINE OUTPUT ANALABLE SUI TANEOUSLY cloud co uk REFER TO INTERNAL CONNECTOR SETTINGS Dancer MPA 60 AND MOTES ON CRCUT BOARD HIGH VOLTAGE GAN L SAN GAIN an an REMOVE THE MANS POWER FROM 9 I 9 THIS PRODUCT BEFORE PERFORMING E ye xt E INTERNAL ADJUSTMENTS n POWER INPUT a Pell 1 SOLEO ET E NM EET MIC INPUTS BALANCED MICROPHONE CONNECTIONS FIN SCREENGROUND w EE PRASE ENT pace mec EE nn Me she si llok sk k
8. Cloud remote control plates Types RSL 6 music source select and level and RL I level only Either type of plate may be connected at the rear 3 pin 5 mm pitch screw terminal connector Remote Music Control using the wiring shown in fig 4 Use two core RSL 6 or RL 1 or single core RL 1 only screened cable to connect the remote level plate max length 100 metres Pressing the button adjacent to the rear panel connector activates the remote control plate and disables both the front panel level and source select controls If an RL I is being used the internal jumper J4 should be moved from its default SW setting to FR to override the disabling of the front panel source select switch See fig 7 for location of jumpers REMOTE SOURCE amp LEVEL CONTROL WIRING REMOTE MUSIC CONTROL CONNECTOR USE TWO CORE SCREENED CABLE UNBALANCED CONNECTION MPA Series User Manual 1 2 7 Music Equalisation One set of independent bass and treble controls is provided for the music signals These preset controls are located on the rear panel below the line input sockets The treble control has a range of 10 dB at 10 kHz and the bass control has a range of 10 dB at 50 Hz Music Priority A Juke Box Digital Sound Store or other audio source can be given automatic priority over all other music inputs by connecting it to Line 6 input and moving internal jumpers 5A and 5B from the OFF position factory defau
9. S MUSIC MUTE INPUT NORMALLY OPEN NO CONNECTION fig 6 Remote Music Mute MUSIC MUTE INPUT NORMALLY CLOSED NC CONNECTION 10 Series User Manual 1 2 General Notes Multi zone Applications Where the sound system specification calls for separate control in several zones MPA Series amplifiers can be used in multiples Signal sources can be connected to several inputs as required but care must be taken to ensure the output stage of the signal source is capable of driving the resulting lower input impedance The impedance of the line inputs music inputs is 47 ohms and it is reasonable to assume that most op amp based signal sources are able to drive 10k ohm load allowing up to five amplifiers to be paralleled The input impedance of the mic inputs is 2 4k ohms making them suitable for microphones with a nominal impedance of 600 ohms or less A single 600 ohm microphone could therefore typically be connected to four paralleled mic inputs If this guideline figure cannot be adhered to the use of suitable mic or line distribution amplifiers is recommended To avoid any problems associated with differences in mains supply earthing we recommend that all MPA Series amplifiers used in a multi zone application should be co located and connected to a common mains supply Note that when using multiple MPA Series amplifiers in a 19 rack suitable ventilation arrangements must be made to ensure that
10. V 70V or 25V line speaker distribution system The secondary output side of the transformer is permanently wired to the line output connector 4 pin 5 mm pitch screw terminal type A safety cover is fitted over the connector which may be removed to connect the speaker cable Replace the cover after the connection has been made The transformer secondary has 3 line outputs 100 V 70 V and 25 V while these have a common connection the output is fully floating i e it is isolated from the rest of the amplifier The maximum total combined load should not exceed the rated power for the amplifier model see table below When driving 100 70 25 V line circuits it is strongly recommended that the amplifier s 65 Hz high pass filter is set ON see High pass filter page 10 Low impedance operation To convert the amplifier to low impedance operation the primary winding of the toroidal transformer nearer the rear of the unit should be unplugged from CONS on the main pcb a short pair of heavy red and black wires and replaced by the spare plug connected to the rear panel low impedance output socket same wire types Refer to fig 7 page 13 for the location of this connector Note that the 100 70 25 V line outputs will no longer be available once the transformer is unplugged even though the transformer secondary is still connected to the line output connector The low impedance output is available on a 2 pin 5 mm pitch screw te
11. board below ribbon cable fig 7 Internal jumpers Factory Default Jumper Settings Mic access triggers chime REAR OF AMPLIFIER 65 Hz high pass filter frequency card socket bypass Front panel source select switch disable J5 A amp B Line input 6 priority Mic over music priority VOX function Line 6 priority release time 3 6 or 12 seconds NOT TO SCALE i2 1 Access Input bypass C MueMdeNoerNe MPA Series User Manual 1 2 13 14 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 MPA Series User Manual v1 2 NN a Cloud Electronics Limited 140 Staniforth Road Sheffield S9 3HF England Tel 44 0 1 14 244 7051 Fax 44 0 1 14 242 5462 email info cloud co uk web www cloud co uk
12. d internally to mono inputs are unbalanced and use RCA phono sockets The input impedance is 47k ohm Line 6 input can be configured to have priority over any other music source see Music Priority page 8 Sensitivity amp Gain Control All six stereo line inputs have a preset gain control on the rear panel adjacent to the respective input sockets The gain control has a range of 20 dB allowing the input sensitivity to be varied from 12 dBu 200 mV to 8 dBu 2 0 V The preset gain control should be adjusted 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 This front panel six position switch is used to select the desired music signal Remote control of source selection is possible with a remote control plate RSL 6 See fig 4 REMOTE LEVEL CONTROL WIRING REMOTE MUSIC CONTROL CONNECTOR SINGLE CORE SCREENED CABLE MAY BE USED fig 4 and RSL 6 Wiring MIC INPUTS PIN 1 SCREEN GROUND PIN 2 COLD ANTIPHASE PIN 3 HOT PHASE BALANCED CONNECTION fig 5 Microphone Input Wiring Claad Music Level Control A front panel mounted music level control is provided Remote control of music level is possible by connecting a remote control plate either RSL 6 or RL 1 See fig 4 Remote Control of Music Source Select and Level The MPA Series mixer amplifiers are compatible with standard
13. external phantom power damage to the microphone may result otherwise Gain Control A mic gain control of the preset type is provided adjacent to each input connector The gain can be adjusted from 10 dB to 50 dB A high overload margin is maintained at all gain settings 8 MPA Series User Manual v1 2 Microphone Access Input Mic input is equipped with an external access control input this is a 2 pin 5 mm pitch screw terminal connector adjacent to the Mic input connector The access input is primarily intended to provide compatibility with paging microphones and their associated switching arrangements By default the access function is bypassed To use the function it must be enabled by moving internal jumper 13 from its default ON setting to OFF See fig 7 for location of jumpers Once enabled the microphone input is muted while the pins of the access connector are open circuit When the pins are connected together Mic input becomes active for use The access input can also trigger the following functions e I Priority over Mics 2 4 Activation of Mic via the access input will give Mic priority over Mics 2 3 and 4 if internal jumper J8 is set to See fig 7 for location of jumpers See also Mic over Mics 2 4 priority page 9 e Chime The internal chime generator will be activated if internal jumper JI is set to ON See fig 7 for location of jumpers See also Chime page 9 Front Panel Microphone
14. h other equipment employing forced air cooling which acts in the opposite direction within the same rack In free standing applications we recommend fitting the feet supplied and placing the unit on a flat surface and leaving the ventilation slots on top of the unit free from any obstructions MPA Series User Manual v1 2 Technical Specifications Line Inputs lt 0 03 kHz dB below full power 80 kHz bandwidth lt 0 04 kHz dB below full power 80 kHz bandwidth 195 mV 12 dBu to 2 0 V 8 dBu Microphone Inputs 3 dB 100 Hz 3 order filter 1 dB 20 kHz 3 dB 100 Hz 3 order filter 2 dB 20 kHz lt 0 03 kHz dB below full power 80 kHz bandwidth 15 switchable per input by jumpers gt 20 dB 127 dB EIN 22 Hz 22 kHz 150 ohms 10 dB 5 kHz 10 dB 100 Hz Outputs 240 Fixed level signal limiter max gain reduction of 20 dB DC protection IV limiting amp short circuit protection switch on delay Forced air front to rear airflow thermostatically controlled see also Low impedance operation page 9 General Specifications 230V 115 V 100V versions available MPAGO UNE BE lt 12 MPA Series User Manual v1 2 Location of internal jumpers etc MPA SERIES MAIN PCB TOP VIEW ONLY PRIMARY COMPONENTS SHOWN CARD SOCKET CHIME VOLUME CONTROL under sub
15. lay mounted close to the MPA Series amplifier 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 MPA Series amplifiers will mute on either a contact closure at the Music Mute input or an open circuit NC Selection of NO or NC operation is made with internal jumper 14 NO is the factory default See fig 6 Bose Equalisation Modules MPA Series amplifiers are compatible with single channel Series equalisation modules modules are available to suit the following loudspeakers Panaray 12 e Panaray 402 11 502B and 502BEX Panaray LT Series Models 3302 4402 9402 and 9702 Modules to suit other models are available please enquire Installation Instructions Refer to the pcb layout diagram see fig 7 for the location of the Bose EQ module connector and its associated bypass jumper J3 To install an EQ module proceed as follows l Switch off the power and isolate the unit from the mains 2 Remove the top panel 3 Remove jumper J3 from the main pcb 4 Plug the 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 5 Replace the top panel REMOTE MUSIC MUTE TERMINATION
16. le for the microphone signals This function is enabled by internal jumper 6 default setting 15 ON When enabled the music signal is automatically attenuated by 30 dB when a microphone signal is detected allowing the message to be clearly heard Normal music operation is restored smoothly after the announcement ends Note that the presence of a signal on any of the four mic inputs will operate this function Mic over Mics 2 4 priority If internal jumper J8 is set to ON the default setting is OFF Mic inputs 2 3 and 4 will muted whenever the Microphone Access Input is enabled This ensures that Mic will always have priority over any other microphones in use when Mic is used for paging Note that if jumper J13 is left at its default setting of ON Mics 2 3 and 4 will be permanently disabled by this function leaving Mic as the only active microphone input Chime The MPA Series amplifiers have an internal pre announcement chime generator The chime is triggered by the Microphone Access Input if enabled by jumper being set to ON JI s default setting is OFF An internal preset rotary control is provided to adjust the chime volume the front panel level controls have no effect on the chime level See fig 7 for locations of internal controls Cloud Power Amplifier Stage and Outputs Line Output The MPA Series amplifier s output stage incorporates an output transformer suitable for driving 100
17. lower amplifiers do not cause those above to overheat see Ventilation for further information EMC Considerations MPA Series amplifiers fully conform to the relevant electromagnetic compatibility EMC standards and are 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 MPA Series amplifier is mounted in 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 transformer 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 an MPA Series amplifier 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 sources using balanced co
18. lt to the ON When this mode of operation is selected the unit will operate normally until a signal is detected on Line 6 when the selected source usually background music 15 muted allowing the source connected to Line 6 to replace it Once the signal on line 6 stops the selected source will smoothly restore to its former level The time taken for the restoration is set in the factory at 3 seconds but it may be set at 6 or 12 seconds with internal jumper J7 3s is suitable for announcements but the longer times may be more appropriate when a jukebox or similar is the Line 6 source See fig 7 for location of jumpers Microphone Inputs Four 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 O to 600 O range Inputs are via 3 pin 3 5 mm pitch screw terminal connectors on the rear panel Connect microphones as shown in fig 5 Note that if using an unbalanced microphone pins and 2 should be connected together Phantom power is available on any or all of the mic inputs and is activated by setting internal jumpers J9 to JI2 for mic inputs to 4 respectively to the ON position See fig 7 for location of jumpers Care should be taken to ensure that phantom power is activated only when the microphone connected to the input requires
19. nnections wherever possible with the cable screen only connected at the receiving end amplifier input e Use audio isolating transformers readily available from trade suppliers at the inputs if necessary These will ensure that the amplifier is electrically isolated from the source equipment e signal source units should be located as close as possible to the amplifiers 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 ground is provided Ventilation MPA Series amplifiers are force cooled by a thermostatically controlled fan The fan is operative at all times remaining at low speed at internal temperatures below 50 then increasing in speed above this temperature to a maximum speed at 70 Always allow adequate space around the amplifier s to allow a free flow of air through the unit s In 19 rack applications we recommend leaving of rack space above and below each unit Plain IU blank panels not slotted ventilation panels should be used as the latter reduce the effect of forced air cooling The direction of airflow in MPA Series amplifiers is from front to rear it is recommended not to mix the amplifiers wit
20. rminal connector on the rear panel Note that one of the output pins is connected internally to The MPA Series amplifiers are able to deliver their rated power into a 4 ohm load as follows Model Rated Power PASO MPAT2O 240 The maximum output power will reduced with higher load impedances When using multiple low impedance loudspeakers normally 8 ohms with a single amplifier series and parallel wiring should be employed to produce a total load impedance of not less than 4 ohms MPA Series User Manual 1 2 9 _ Claud High pass filter A high pass filter is provided to protect speakers transformers etc from the effects of low frequency signals The filter is enabled by the internal jumper J2 see fig 7 The filter reduces the output level of frequencies below 65 Hz and ideally should be used if the line output transformer is in circuit 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 MPA Series amplifiers include a facility to mute the music signals only i e mic inputs are still active via the Music Mute input This is a 2 pin 5 mm pitch screw terminal connector on the rear panel and the contacts are fully isolated Activation of the Music Mute is often via a re
21. tion Mains Fuse Replace the mains fuse only with the same type and rating as marked on the rear panel The fuse body size is 20mm x 5mm 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 Disconnect the power cable from the unit before removing the top panel and do not make any internal adjustments with the unit switched on Only reassemble the unit using bolts screws identical to the original parts General Description The Cloud MPA Series is a range of mixer amplifiers with applications in Licensed Retail Leisure and similar venues Three models are available to suit different output power requirements 60 120 or 240 watts otherwise all models have identical facilities The mixer amplifiers have inputs for six stereo line signals and four microphone signals Front panel controls are provided for music source selection music level and microphone levels All pre set controls are located on the rear panel with further configuration jumpers mounted on the main PCB A remote level control or combined level control music source selector can be wired to the unit for installations that require remote control Schematic Diagram 1 HIGH PASS FILTER ACCESS CONNECT INPUT INPUTS OV TO OPEN MIC CHANNEL T SPEAKER EQ HIGH MIC1 jak
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