Opal1202 Manual - Australian Monitor
Contents
1. AA Australian Monitor PROFESSIONAL AUDIO POWER AMPLIFIERS CONTRACTOR and Opal Audio Amplifiers OPERATION MANUAL IMPORTANT Please read carefully This Operation Manual contains important information regarding safety precautions performance maintenance and operation of your power amplifier You should familiarize yourself with the contents of this manual before operating your amplifier Safety Precautions and Labelling The rear panel of the unit has a number of markings and internationally recognized symbols related to the hazards and precautions that should be taken when operating MAINS connected equipment The presence of a LIGHTNING FLASH with an arrow head contained within the boundaries of a equilateral triangle is intended to alert the user that dangerous uninsulated voltages may exist within the units enclosure These voltages may be of a sufficient magnitude as to constitute the risk of an electrical shock This symbol is reinforced with the text ICAUTION RISK OF ELECTRICAL SHOCK DO NOT OPEN The presence of an EXCLAMATION MARK contained within the boundaries of a equilateral triangle is intended to alert the user that there is important operating and maintenance literature that accompanies the unit WARNING DO NOT EXPOSE TO EITHER RAIN OR MOISTURE The unit should not be operated in a situation where it may encounter the entry of water rain or any fluids To expose the u2. 14 kHz 15 kHz 1 1 Frequency Response 0 5 0 15dB 3dB Output Impedance 1 kHz Damping Factor 1 kHz 8 ohm load Power Power 8ohm 4ohm 120W 175W 120W 160W 340W lt 0 005 lt 0 005 lt 0 008 20Hz 20kHz 5 Hz 95kHz 15 milliohm typical 250 1 Input Impedance Line to Line Balanced Input Sensitivity At rated output into 8 ohms Input CMRR 1 kHz Voltage Gain 1 kHz Output Rise Time 20 kHz square wave 113Vpp leading edge Slew Rate 20 kHz square wave 145Vpp leading edge Signal Noise ratio linear 30 kHz A weighted Crosstalk 1 kHz Weight net packed Dimensions excluding handles 25 kohm 1 23V 4dBu gt 81 5dB 28dB 19 x 24 uS 35V pS 102 dB 104dB lt 90dB 33 lb 15kg 37 Ib 17 kg HxWxD 3 5 x 19 x 14 8 inch 88 x 482 x 375 mm 19 inch EIA rack mounting 2 units high OT Specifications 23 Model Opal 2802 C600 PA 6 Output Power Power Power 8ohm 4ohm E LA 1 kHz lt 0 05 THD pre stress at rated power for 5 min single channel driven 215W 300W both channels driven 200W 280w Bridge Mode 560W Distortion 0 5 dB below clipping re 4 ohms THD 1 kHz lt 0 005 IMD SMPTE 60 Hz 7 kHz 4 1 lt 0 015 IMD CCIF 14 kHz 15 kHz 1 1 lt 0 008 Frequency Response 0 5 0 15 dB 20 Hz 20 kHz 3dB 5 Hz 95 kHz Output Impedance 1 kHz 15 milliohm typical D
3. Distortion 0 5 dB below clipping re 4 ohms THD 1 kHz lt 0 005 IMD SMPTE 60 Hz 7 kHz 4 1 lt 0 015 IMD CCIF 14 kHz 15 kHz 1 1 lt 0 008 Frequency Response 0 5 0 15 dB 20Hz 20kHz 3dB 5 Hz 95 kHz Output Impedance 1 kHz 15 millionm typical Damping Factor 1 kHz 8 ohm load 500 typical Input Impedance Line to Line balanced Input Sensitivity At rated output into 8 ohms At rated output into 4 ohms Input CMRR 1 kHz Voltage Gain 1 kHz Output Rise Time 20 kHz square wave 127Vpp leading edge Slew Rate 20 kHz square wave 127Vpp leading edge Signal Noise ratio linear 30 kHz A weighted Crosstalk 1 kHz Weight net packed Dimensions excluding handies including handles 25k ohm 1 2V 3 8dBu 1 0V 2 3dBu gt 80 dB 31 dB 37x 2 4 uS 42VinS 100 dB 104 dB lt 90 dB 37 51b 17 kg 42 6lb 20kg HxWxD 3 5 x 19 x 14 8 inch 88 x 482 x 375 mm 3 5 x 19 x 17 9 inch 88 x 482 x 455 mm 19 inch EIA rack mounting 2 units high Model PA 12 Output Power E I A 1 kHz lt 0 05 THD pre stress at rated power for 5 min single channel driven both channels driven Pulsed 1 kHz at onset of clipping 10 duty cycle single channel driven 10 duty cycle both channels driven Bridge mode 2 Ohm capability single channel driven both channels driven Distortion 0 5 dB below clipping
4. Output clip indication at 1 dB Symmetrical weight distribution Massive heat sink and heat exchangers Well regulated high current power supply Efficient front to back cooling High VA capable toroidal mains transformer Single speed automatic axial fans Binding post output connection Output fault indication Stereo or bridged mono operation Plug in signal processors optional Input signal XLR and tag strip connector High quality close tolerance components 21 Position detented attenuators throughout Protection Features Suppression of inrush current at mains turn on Independent DC supply rail fuses Input muting at turn on Layout grounding decoupling and componentry Input overvoltage protection have been optimized to provide the user with Radio frequency interference suppression stability reliability and longevity Short circuit protection and indication Australian Monitor fm 1 Introduction Congratulations on choosing Austral an Monitor for your professional amplification requirements The design of your audio power amplifier embraces all the aspects of a well designed unit The visual design me chanical electricat and sonic parameters along with our dedicated manufacturing processes have all been optimized to provide a professional tool that exhibits quality reliability and longevity Figure 1 shows a block diagram of the amplifier Each channel of the ampl
5. circuitry and some resultant distortion will occur before full output power is achieved Sensitivity Your amplifier is a linear device operating with a fixed input to output voltage gain The maximum output voit age swing is determined by the applied mains voltage the load load type and the duty cycle of the applied signal The voltage gain factor of your amplifier is C300 PA3 199x or25dB C600 PA6 290x or 27dB C800 PA8 370x or 31 36dB C1200 PA12 45 25x or 33 11dB Opal 1202 199x or25dB Opal 2802 29 0x or27dB The input sensitivity for your amplifier when the attenuator is at the O dB attenuation position fully clockwise is nominally 4 0dB 1 23 volts for rated power into an 8 ohm load 2 6dB 1 04 volts for rated power into a 4 ohm load Each channel of your amplifier has a balanced input impedance of 25k Ohms 25 000 and should not present a difficult load for any signal source The signal source i e the eguipment feeding the ampli fier should have an output impedance of 2k Ohms 2 000 or tower to avoid unwanted high frequency loss in the cabling Input overtoad occurs at 20 5dBu 8 25 volts See the specification section for more detailed informa tion Hum Problems Most equipmentis designed for minimum hum when used under ideal conditions When connected to other equip ment and to safety earth in an electrically noisy environ ment problems will often occur The
6. clipping infrequent Rear Panel Figure 3 shows layouts of the rear panels the section numbers refer to areas on the drawing The functions of the controls and indicators are as follows 6 Balanced Input A female 3 pin XLR connector is provided on each input Pin 1 Signal Ground Pin 2 Cold inverting or reverse phase Pin 3 Hot non inverting or in phase 6b Level Control Contractor version only A rear panel mounted 21 position detented potentiometer is provided on all Contractor models for input level control on each channel 6c Barrier Strip Input A three terminal barrier strip connector is provided for hard wiring signal input in permanent situa tions This input is parallel with the input XLR 7 Signal Ground Lift Switch C800 amp C1200 only When this switch is engaged it disconnects signal ground from the input connectors on both channels lt is intended to be used to isolate earth loops due to different ground potentials between source eguip ment and the amplifier or stray magnetic field pick up on the input ground shield wiring It does not interrupt signal ground continuity on the strapping connector The amplifier should be turned off before engaging this switch Please read the Hum Problems information in the Operation section of this manual 8 Binding Post Outputs Binding posts banana jacks are provided for speaker output termination with banana plugs spade type lugs or bar
7. control the loudspeaker and deal with the reactive energy from the loudspeaker load that is dissipated within the amplifier Your amplifier is able to drive 2 ohm loads or operate in BRIDGE mode into 4 ohms The operator must be aware that when driving 2 ohm loads or bridged 4 ohm loads that the currents running in the output stage are very large and will cause greater heat build up within the amplifier than higher impedance loads will The front panel fault indicators can be used to provide an indication of the difficulty of the load and will give the operator an indication of the heat build up in the output stage If the Fault LED indicators flash with the Status clip LED or do not illuminate until well into clipping then the load can be considered as normal or easy If the Fault LED indicator starts to flash before the Status clip LED then the load should be considered complex and or difficult For the more complex and or difficult loads the illumina tion of the Fault LED on programme peaks should be interpreted as the output level limit Driving the output continuously past this point could result in muting of the output stage fuse blowing or premature thermal shut down 16 7 Maintenance Your amplifier will need minimal maintenance No inter nal adjustments need to be made to the unit to maintain optimum performance To provide years of unhindered operation we suggest a maintenance i
8. re 4 ohms THD 1 kHz IMD SMPTE 60 Hz 7 kHz 4 1 IMD CCIF 14 kHz 15 kHz 1 1 Frequency Response 0 5 0 15 dB 3dB Output Impedance 1 kHz Damping Factor 1 kHz 8 ohm load Power Power 8ohm 4o0hm 430W 700W 400W 605W 930W 900W 1200W 1400W 800W 700W lt 0 005 lt 0 015 lt 0 008 20Hz 20kHz 5 Hz 95 kHz 15 milliohm typical 500 typical Input Impedance Line to Line balanced Input Sensitivity At rated output into 8 ohms At rated output into 4 ohms Input CMRR 1 kHz Voltage Gain 1 kHz Output Rise Time 20 kHz square wave 145Vpp leading edge Slew Rate 20 kHz square wave 145Vpp leading edge Signal Noise ratio linear 30 kHz A weighted Crosstalk 1 kHz Weight net packed Dimensions excluding handles including handles 25k ohm 1 23V 4dBu 1 1V 3dBu gt 80 dB 33 dB 45 x 2 4 uS 50V uS 100 dB 105 dB lt 90 dB 42 1b 19 kg 47 5lb 21kg HxWxb 3 5 x 19 x 14 8 inch 88 x 482 x 375 mm 3 5 x 19 x 17 9 inch 88 x 482 x 455 mm 19 inch EIA rack mounting 2 units high Australian Monitor fm 22 Specifications Model Opal 1202 C300 PA 3 Output Power ELA 1 kHz lt 0 05 THD pre stress at rated power for 5 min single channel driven both channels driven Bridge Mode Distortion 0 5 dB below clipping re 4 ohms THD 1 kHz IMD SMPTE 60 Hz 7 kHz 4 1 IMD CCIF
9. three E s of hum and hum related noise which can plague your audio system are a Electrostatic radiation b Electromagnetic radiation and c Earth loops Electrostatic radiation capacitively couples to system elements causing an interference voltage that mainly affects higher impedance paths such as amplifier inputs The source is generally a nearby high voltage such as a mains lead or a speaker lead The problem can usually be reduced by moving the offending lead away or by provid ing additional electrostatic shielding i e an earthed con ductor which forms a barrier to the field Electromagnetic radiation induces interference currents into system elements that mainly effect low impedance paths Radio transmitters or stray magnetic fields from mains transformers are often the cause of this problem lt is generally more difficult to eliminate this kind of interference but again moving the source away or pro viding a magnetic shield i e a steel shield should help Earth loops can arise from the interfacing of the various pieces of eguipment and their connections to safety earth This is by far the most common cause of hum and it occurs when source eguipment and the amplif er are plugged into different points along the safety earth and where the safety earth wiring has a current in it The current flowing through the wire produces a voltage drop due to the wire s resistance This voltage difference between the amplfier
10. 5 0 15 dB 3dB Output Impedance 1 kHz Damping Factor 1 kHz 8 ohm load Power Power 8ohm 4onm 260W 400W 300W 480W 280W 430W 630W 600W 860W 1020W 510W 500W lt 0 005 lt 0 015 lt 0 008 20Hz 20kHz 5 Hz 95 kHz 15 milliohm typical 500 Input Impedance Line to Line Balanced 25 kohm Input Sensitivity At rated output into 8 ohms At rated output into 4 ohms 1 2V r3 8dBu 1 0V 2 3dBu Input CMRR 1 kHz gt 80 dB Voltage Gain 1 kHz 31 dB 37 x Output Rise Time 20 kHz square wave 127Vpp 2 4 uS leading edge Slew Rate 20 kHz square wave 127Vpp 42V uS leading edge Signal Noise ratio linear 30 kHz 100 dB A weighted 104 dB Crosstalk 1 kHz lt 90 dB Weight net 37 5lb 17kg packed 42 161b 20kg Dimensions HxWxD 3 5 x 19 x 14 8 inch 88 x 482 x 375 mm 3 5 x 19 x 17 9 inch 88 x 482 x 455 mm 19 inch EIA rack mounting 2 units high excluding handles including handles A soo Specifications 19 Model C1200 Output Power Input Impedance Power Power Line to Line Balanced 25 kohm 8ohm 4ohm F T C 20 Hz 20 kHz 0 196 THD Input Sensitivity pre stress 4dB below rated power At rated output into 8 ohms 1 23V 4dBu for 1 hr amp rated power for 5 min K both channels driven 390W 560W At rated output into 4 ohms 1 1V 3dBu E LA 1 kHz lt 0 05 THD Input CMRR pre stress at rated power for 5 min 1 kHz gt 80 dB
11. A attenuator becomes the level control for both channels 2 Engage the push to bridge switch on the rear of the amplifier 3 Connect your load between the red binding post output terminals i e the positive side of the load is connected to the channel A output and the negative side of the load goes to the channel B output There are no further connections reguired C300 PA3 OPAL 1202 35V C600 PA6 OPAL 2802 70V ERON GU SOURCE C800 PA8 80V C1200 PA12 100V es CHB GALANCED euT CHA LU gt gt GC herent pe Le see z Y 2 7 io ais S o Cc w 9 OUTPUT 400W 14 Orn AAA LE id G Figure 5 Bridge Mode Speaker Connection All Models A 6 Load Impedance NOTE Ensure adeguate ventilation and monitor the FAULT indicators to guard against thermal shutdown when driv ing two ohm loads The load that a loudspeaker presents to an amplifier is very complex and at different frequencies can be induc tive capacitive resistive or a combination of these With the complex interaction of these attributes which alter from loudspeaker to loudspeaker a definitive load for an amplifier does not really exist Loudspeakers operating within an enclosure carry anomi nalimpedance This nominal impedance is a rough guide only to the actual characteristics of the speaker As an example a loudspeaker with a nomi
12. Installation Mains Lead Wiring WARNING Your amplif er must be earthed at all times When you first receive your amplifier it may not have a mains plug attached You must ensure that an appropri ate plug is used It must correspond with the amplifier s current ampere reguirements and meetthe approval of your local energy authority The wires in the mains lead are coloured in accordance with the following code GREEN amp YELLOW EARTH Connect to the terminal marked with the letter E with the EARTH SYMBOL or coloured GREEN BLUE NEUTRAL Connect to the terminal marked with the letter N or colored WHITE in USA and Canada or coloured BLACK in the United Kingdom BROWN ACTIVE LIVE Connect to the terminal marked with the letter A or L or colored BLACK in USA and Canada or coloured RED in the United Kingdom Power Reguirements Ensure that your mains supply voltage is the same as the rear panel mains voltage marker Each model s power consumption s as follows 110 120 Volt Models Amps Watts Watts at atidle full power C300 0pal1202 PA3 6 50 450 C600 Opal2802 PA6 15 100 1000 C800 PA8 15 120 1400 C1200 PA12 20 160 2200 220 240 Volt Models Amps Watts Watts at atidie full power C300 Opai1202 PA3 3 50 450 C600 Opal2802 PA6 6 100 1000 C800 PA8 7 120 1400 C1200 PA12 10 160 2200 Australian Monitor Mounting Your amplifier is designed for standard 19 rack mount ing and occupies 2 EIA rack unit
13. SPEAKON CHB R Figure 4 Neutrik Speakon Connector wiring Australian Monitor fm 12 4 Operation IMPORTANT All signal source equipment should be adequately earthed This not only ensures your safety but everybody else s as well Faults can and do occur in mains connected equip ment where the chassis can become live if it is not properly earthed In these instances the faultin a floating ungrounded piece ofeguipmentwill look for the shortest path to ground which could possibly be your amplifier s input If the fault current is large enough it will destroy the input to your amplifier and look for the next available path which may be you Before making any connections to your amplifier ob serve the following Ensure the mains voltage supply matches the label on the rear panel of your amplifier Ensure that all system grounds earths are connected to a common point Avoid powering several pieces of eguipment from multiple power sources that may be separated by large distances Check the continuity of all interconnecting leads to your amplifier ensure that there are no open or short circuited conductors Ensure that the power handling of your load speakers can adeguately cope with the power output of the am plifier N o A Before operating your amplifier ensure that the attenuators are at the OFF position fully anticlock wise the power switch
14. a thermal overload this LED will turn red indicating that the internal operating tempera ture of the amplifier has exceeded a safe level of Operation and that the amplifier has shut down The fm fans will continue to run and once the amplifier has had a cool down period the unit will restart auto matically providing inrush current suppression and input muting 5 Status Indicator This is a dual colour LED which displays the status of the output stage and displays three levels of operation These levels are Below 1 watt uniit 1 watt and above green 1dB below actual clipping red The LED will turn green once the output voltage exceeds 2 828 volts 1 watt re 8 ohms or 2 watts re 4 ohms The LED will change to red once the output exceeds the 1dB point before actual clipping of the amplifi er s output stage The threshoid of the 1dB point is with reference to the amplifier supply rails and will alter with changes in the mains supply changes in the load and duty cycle fluctuations The attack and delay time ballistics of the status circuit are those of a Peak Programme Meter P P M If using this indicator to line up sensitivities apply a steady tone e g slate on a mixing console The 1 watt level is the point when indicator comes on re 8 ohms or 2 watts for 4 ohm loads The amplifier is not damaged by running into clip ping but your speakers may be To maximise the life of your speakers try to keep
15. amping Factor 1 kHz 8 ohm load 250 1 Input Impedance Line to Line Balanced 25 kohm Input Sensitivity At rated output into 8 ohms 1 23V 4dBu Input CMRR 1 kHz gt 81 5dB Voltage Gain 1 kHz 31dB 37x Output Rise Time 20 kHz square wave 113Vpp 2 4 uS leading edge Slew Rate 20 kHz square wave 145Vpp 35V us leading edge Signal Noise ratio linear 30 kHz 100 dB A weighted 104dB Crosstalk 1 kHz 90dB Weight net 33 Ib 15kg packed 371b 17kg Dimensions HxWxD excluding handles 3 5 x 19 x 14 8 inch 88 x 482 x 375 mm 19 inch EIA rack mounting 2 units high Australian Monitor Ax
16. be used XLR Inputs When wiring for a balanced source the connector going to the inputs of your amplifier should be wired as follows Pin 3 HOT non inverting Pin 2 COLD inverting Pin 1 Ground Shield When wiring from an unbalanced source you must ensure that pin 2 is connected to pin 1 input ground either by linking the pins in the input connector or at the source eguipment output wiring Therefore when wiring for an unbalanced source Pin 3 Hot in phase with the amplifier s output Pin 2 Connect to pin 1 Ground Shield Pin 1 Ground Shield Barrier Strip Inputs The barrier strip connector on the Contractor Series models is wired in parallel with the female XLR input connector as follows Pin 3 ve non inverting Pin 2 ve inverting Pin 1 GND input signal ground NOTE Some in line XLR connectors have a termination lug that connects directly to the chassis of the connector Do not link this lug to pin 1 at the amplifier s input as it will defeat the amplifier s input grounding scheme This lug is often referred to as a drain and is used to provide a circuit to the chassis not signal ground for shielding purposes This is useful when further isolation of signal grounds is required between source and destina tion eg to help in reducing earth loop noise or noise induced into signal grounds from stray magnetic fields A Output Wiring When wiring to your speakers always use the large
17. e To obtain warranty service the eguipment should be shipped to an authorised Australian Monitor dealer or to Australian Monitor at the above address at the owner s expense Units with a defaced serial number will not be accepted for warranty service Any evidence of alteration erasure or forgery of purchase receipt will also void this warranty Australian Monitor accepts no liability for any consequen tial damages whether direct or indirect arising from the use or misuse of its products Australian Monitor reserves the right to alter its designs and specifications at any time without notice or obligation to previous purchasers MODEL Ensure that you fill out and send your warranty registration card Use this copy to record a duplicate of the details Australian Monitor 18 9 Specifications Model C800 Output Power F T C 20 Hz 20 kHz 0 1 THD pre stress 4dB below rated power for 1 hr amp rated power for 5 min both channels dr ven E L A 1 kHz lt 0 05 THD pre stress at rated power for 5 min single channel driven both channels driven Pulsed 1 kHz at onset of clipping 10 duty cycle single channel driven 10 duty cycle both channels driven Bridge mode 2 Ohm Capability single channel driven both channels driven Distortion 0 5 dB below clipping re 4 ohms THD 1 kHz IMD SMPTE 60 Hz 7 kHz 4 1 IMD CCIF 14 kHz 15 kHz 1 1 Frequency Response 0
18. e wire The red post is used as positive and the black postis used as negative Australian Monitor Controls amp Connectors 7 9 Mains Lead Connector I E C Your amplifier is supplied with a IEC mains lead power cord appropriately rated for the mains sup ply voltage marked on the rear panel of your ampli fier The wires in the mains lead are coloured in accordance with the following code BROWN ACTIVE BLUE NEUTRAL GREEN amp YELLOW EARTH Your unit must always be earthed Note 110V version are supplied with heavy duty mains lead 10 Mains Fuses M 205 fast blow type fuses are used in these ampli fiers Fuses need to be replaced with the same type and the value must be as follows C300 0pal1202 PA3 3A C600 Opai2802 PA6 6A C800 7A C1200 PA8 PA12 10A 11 Bridge Switch Pushing this switch in engages the BRIDGED MONO mode of operation In this mode your amplifier will only accept signal applied to channel A s input XLRs and the level of both channels will be controlled by channel A s attenuator The output from channel B will automatically be of the opposite polarity re versed phase and speaker termination should be sourced from the red binding post outputs Please read the Bridge Mode section of this manual CHA VE Phase CHB VE Phase 8 Controls amp Connectors Contractor Series Figure 3 Rear Panel Layouts Ax 3
19. earth and source eguipment earth appears to the amplifier s input as an input signal and is amplified as hum Australian Monitor There are three things you can do to avoid earth loop probiems 1 Ensure your mains power for the audio system is guiet i e without equipment on it such as air conditioning refrigeration or lighting which will generate noise in the _ earth circuit 2 Ensure all equipment within the system shares a com mon ground or safety earth point This will reduce the possibility of circulating earth currents by referencing equipment to the same ground potential 3 Ensure that balanced signal leads going to the ampli fier are connected to earth at one end only Signal Giound Lift Switch C800 amp C1200 Only When proper system hook up has been carried out you may still have some hum or hum related noise This may be due to any of the previously mentioned gremiins The Contractor Series amplifiers have a Signal Ground Lift switch which disconnects the input ground wiring from the amplifier A substantial drop in hum and or hum related noise may result by use of this switch Always ensure that your amplifieris off and the attenuators are down when you engage this switch This switch should only be used when the amplifier is operated from a balanced signal source Be wary of guasi balanced outputs these are often no more than floating unbal anced outputs NOTE If the input ground lift switch
20. ifier comprises a balanced active input with a buffered attenuator driving a differential class INPUT PRE AMP STAGE INSERT POINT Figure 1 Amplifier Block Diagram Ax BUFFER STAGE A drive stage which in turn drives a fan cooled class AB MOSFET output stage configured as a source follower The unit operates from a high current capable linear power supply The Contractor Opal and PA Series are 2 units tall 3 5 in 19 wide rack mountable cases These units have been specifically designed to deliver their high power output with minimal distortion and pro vide the critical degree of control reguired by your speak ers at high duty cycles for extended periods DRIVER STAGE OUTPUT CHA O P CH B O P O aura 2 Controls Connectors amp Indicators Models and Variants While these amplifiers are designed to suit different Opal Series applications all variants use the same electronics Opal 1202 2x 175W 4 ohms The output powers are Opal 2802 2 x 300W 4 ohms Contractor Series PA Series C300 2x 175W 4 ohms PA 3 2 x 175W 4 ohms C600 2 x 300W 4 ohms PA 6 2 x 300W 4 ohms C800 2 x 400W 4 ohms PA 8 2 x 400W 4ohms C1200 2 x 600W 4 ohms PA 12 2 x 600W 4 ohms EP fx Australian Monitor ma 12 4 32 4 Contractor Series o J PA Series Figure 2 Front Panel Layouts Au
21. is OFF the GROUND LIFT Switch is not engaged should be in the out position the BRIDGE Switch is not engaged unless you are run ning the amplifier in bridged mode Powering Up REMEMBER The amplifier should be the last piece of eguipment that you turn ON and the first piece of eguipment that you turn OFF We recommend turning the attenuators on your amplifier down when turning the unit on When you power up your amplifier goes through an establishment period before it will accept signal The Inrush Current Supression ICS circuit is in operation for the first 0 5 seconds This limits the mains current to prevent nuisance tripping of circuit breakers caused by high start up currents fh The ICS circuit also operates a 30dB input mute After two seconds this mute will release allowing any applied input signal to pass unattenuated When switching the amplifier OFF wait a couple of seconds before switching the unit on again This allows the ICS circuit to reset Level Matching The normal position for the attenuator is the 0 dB position fully clockwise no attenuation In this position the amplifier operates at full gain Turning the attenuator back anticlockwise reduces the input sensitivity by the amount marked on the attenuator scale NOTE If full power output is required you should operate your amplifier with the front panel attenuator above the 15dB position otherwise clipping of the input
22. is used you must ensure adequate shielding of the input wiring If the signal source equipment does not provide adequate shielding you must disconnect your shield from input connector pin 1 and re connect it to the drain contact going to the amplifiers input This will ensure the shield on your input wiring actually goes to the amplifier chassis and subsequently to earth 14 5 Bridge Mode The term BRIDGE is used when two independent ampli fier channels are used to drive the same load The oad is in series a bridge between outputs of the two amplifier channels Channel A is used as the dominant channel and its output is in phase with the input signal channel B is phase reversed so its output is exactly 180 out of phase with the input signal Using two amplifiers this way with a phase difference of 180 provides a doubling of the voltage and four times the power into the load The ouputis now an active balanced output Acommon use of an amplifier in bridge mode is for driving 70 and 100 volt distribution lines or the amplifier can be used in bridge mode to provide the correct voltage power requirements for a specific load Each amplifier can deliver the listed voltage into a load of 8 ohms As shown in the diagram there are three steps in setting up your amplifier for running in BRIDGE mode Whilst the amplifier is OFF 4 Connect the signa source to the channel A female in put XLR The channel
23. nal impedance of say 8 ohms may have an impedance of over 50 ohms at resonance drop to less than 6 ohms after the reso nance peak and then increase to over 16 ohms for higher frequencies A 6 ohm load makes an amplifier work harder than an 8 ohm load at the same voltage as it requires more current Though various loudspeakers may have an equal nomi nal impedance some loads are more equal than others with apologies to G B Shaw As well as this burden on the amplifier the transient waveforms found in actual use can demand more current than the steady state sinewaves used in most amplifier bench tests The power output of your amplifier quoted on the specifi cation sheet is derived from voltage excursion into a resistive load for a sine wave at a given frequency Though this method is in tine with the various standards that exist it only gives an indication of maximum voltage swing before clipping for a given load This method of rating power does not give an indication of the current Ampere capability of the amplifier nor does it show the amplifier s ability to sustain high energy waveforms Australian Monitor 15 Your amplifier is designed to be able to deliver more than twice the current than that shown on the specification sheet to cope with difficult loads and or high energy waveforms This extra current reserve is the result of over engineer ing and is the headroom the ampiifier utilizes to
24. nit to the above conditions may make the operation of the unit hazardous and increase the risk of electrical shock Ae REFER SERVICING TO QUALIFIED PERSONNEL ONLY The user should not attempt to service the unit Only qualified and Knowledgeable personnel familiar with the internal workings of the unit should attempt any repair servicing or authorized modification to the unit NO USER SERVICEABLE PARTS INSIDE The unit does not contain any parts which the user can service or re use in this or any other product If you are in need of special assistance and the informa tion you require is outside the scope of this manual please contact your nearest service agent or Australian Monitor direct THE TECHNICAL OFFICER AUSTRALIAN MONITOR PTY LTD 29 HOPE ST ERMINGTON SYDNEY N S W AUSTRALIA 2115 Phone Fax Local 02 874 9355 02 874 9366 International 612 874 9355 612 874 9366 Contents 1 Introduction 4 List of Illustrations 2 Controls Connectors amp Indicators 5 3 Installation 9 4 Operation 12 Figure 1 Block Diagram 4 5 Bridge Mode 14 Figure 2 Front Panel Layouts 5 6 Load Impedance 15 Figure 3 Rear Panel Layouts 8 7 Maintenance 16 Figure 4 Speakon Connector Wiring 11 8 Warranty 17 Figure 5 Bridge Mode Speaker Wiring 14 9 Specifications 18 Features Custom designed heavy duty alloy chassis 1 Watt output indication Open modular construction for ease of servicing
25. nspection be carried out every 12 months or so Fuses WARNING Make sure the unit is OFF and give the main filter capacitors time to discharge before removing fuses The positive and negative rail fuse holders use spring loading to apply force to the contact faces of the 3AG fuse cartridge The surface around the mechanical contact area of the fuse can be subject to oxidization in some environments Removing and re installing the fuse will help renew the contact surface You should replace the fuse if the element is sagging or discoloured When checking for a failed fuse do not rely on visual inspection alone You should use an ohmmeter to check continuity Fans Due to the openness ofthe air path through your amplifier very little dust should settle within the amplifier The unit has been designed so that any dust and or foreign parti cles that do settle within the amplifier will not unduly hinder the cooling of the unit Over time dust may build up on the leading edge of the fan blades and reduce their cooling efficiency The time taken for this to happen will depend on the environment and the amount of use am 8 Warranty Australian Monitor Pty Ltd of 29 Hope St Ermington Sydney N S W 2115 Australia warrants the original purchaser of each amplifier purchased from an author ised Australian Monitor dealer that it will be free from defects in material and workmanship for the whole
26. s 3 5 The mounting centers are Vertical 3 0 76 2mm Horizontal 18 2 to 18 6 461 2mm to 473 8mm The slots in the mounting flange will accept bolt diameters up to 1 4 6 35mm We recommend that you provide additional support for the amplifier especially if road use is planned as the amplifiers weight can bend some racks This support can be provided by secure shelving support rails or rear panei support brackets Cooling All amplifiers are cooled by an axial fan which draws cool air from the front of the unit and expels the heated air from the side of the unit The C800 amp C1200 amplifiers expel the heated air from the rear of the unit Standard units offer speed control fans which are turned on when the output level is above 2 watts into 4 ohms and stay on while the heatsink is hot The C800 amp C1200 offer two speed fans which normally run at half speed and switch to full speed when the internal heatsink temperature exceeds 60 C 128 F An unrestricted airflow into and out from the unit must be provided Any restriction of the air flow will cause heat to build up within the unit and possibly force the unit into its thermal shutdown mode 10 Installation Input Wiring NOTE Input signal ground is not to be used as a safety ground earth The input to your amplifier is a balanced 3 pin system and reguires all three pins to be connected Only high guality twin core shielded cable should
27. single channel driven 430W 700w both channels driven 400W 605W Voltage Gain Pulsed 1 kHz at onset of clipping 1kHz nie 10 duty cycle single channel driven 930W 10 duty cycle both channels driven 900W 5 Output Rise Time Bridge mode 1200W 1400W 20 kHz square wave 145Vpp 2 4 uS leading edge 2 Ohm Capability MU ont Shek Bow Slew Rate Hy snannelsidnwen 20 kHz sguare wave 145Vpp 50V uS gt 5 leading edge Distortion 0 5 dB below clipping re 4 ohms Signal Noise ratio THD 1 kHz lt 0 005 reve E ae a IMD SMPTE 60 Hz 7 kHz 4 1 lt 0 015 9 IMD CCIF 14 kHz 15 kHz 1 1 lt 0 008 Crosstalk Frequency Response 1 kHz 2208 0 5 0 15 dB 20Hz 20kHz 3dB 5 Hz 95 kHz Weight Output Impedance net 42 tb 19 kg tp P packed 47 5 Ib 21 kg 1 kHz 15 milliohm typical Dimensions HxWxD excluding handles 3 5 x 19 x 14 8 inch Damping Factor 88 x 482 x 375 mm 1 kHz 8 ohm load 500 typical including handles 3 5 x 19 x 17 9 inch 88 x 482 x 455 mm 19 inch EIA rack mounting 2 units high Australian Monitor f 20 Specifications o S o Model PA 8 Output Power Power Power 8ohm 4o0hm E I A 1 kHz lt 0 05 THD pre stress at rated power for 5 min 300W 480W Pulsed 1 kHz at onset of clipping 10 duty cycle single channel driven 630W 10 duty cycle both channels driven 600W Bridge mode 860W 1020W 2 Ohm capability single channel driven 510W both channels driven 500W
28. st gauge wire your connector will accept The longer the speaker lead the greater the losses will be resulting in reduced power and less damping at the load We recom mend using a heavy duty two core flex four core flex if bi amping 10 to 12 gauge 2mm to 2 5mm or 50 0 25 or eguivalent as a minimum Binding Post Outputs When terminating to the 4 mm binding post banana jack output connectors banana plugs or spade type lugs can be used The red terminal is positive and the black terminal is negative If running in BRIDGE mode only the red binding posts are used Channel A provides the positive output to the load and channel B provides the negative output to the load Speakon Outputs C800 amp C1200 only When using the NEUTRIK Speakon NL4MP connector for speaker output use only the mating NEUTRIK NL4FC in line connector This connector is designed so that both channels can be fed from a single connector Two Speakon connectors are provided on the other amplifier The channel A Speakon actually carries both channel A amp channel B outputs see figure 4 Speaker Wiring Diagrams The channel B Speakon carries only the channel B output This gives you options of connect ing outputs separately or together through a single or two connectors eb nsstailation 11 SINGLECONNECTION BRIDGED CONNECTION CHA LEFT OR CH B RIGHT SPEAKON DUAL CONNECTION CHA CHA L
29. stralian Monitor Ax 6 Controls amp Connectors ns a Ft c Front Panel Figure 2 shows layouts of the front panels the section numbers refer to areas on the drawing The functions of the controls and indicators are as follows 1 Fault Indicator This amber LED will flash when a fault condition exists The fault detection circuit monitors the difference between drive and output of your amplifier A short on the speaker output or a blown negative rail fuse the LED will flash brightly in sync with the programme This LED will also flash with programme peaks for gross overloads or if the load is 2 ohms or less The circuit has two stages of operation 1 It will provide indication e g gross overload but does not affect the input signal 2 It will indicate and mute the input signal e g shorted output 2 Attenuator Level control for your amplifier is provided by a 21 position detented potentiometer and indicates gain reduction in decibels from the 0 dB position maxi mum gain no attenuation 3 Power Switch Press the switch to the right for power ON Press the switch to the left for power OFF At start up turn on the input to the amplifier is muted by 30dB for approximately two seconds 4 On Thermal Indicator This is a dual colored LED which will normally be green and indicates that the amplifier is on and receiving mains power In the advent of
30. war ranty period from the original date of purchase Australian Monitor will at its option repair or replace any unit or component covered by this warranty which be comes defective or malfunctions under normai use and service during the period of this warranty at no charge for parts or labour to the original owner This warranty does not cover blown fuses faulty fuse contacts thermal problems due to obstructed airflow or defects or malfunctions resulting from accidents misuse abuse operation with the incorrect AC volt age connection to faulty eguipment modification or alteration without prior factory approval or service by unauthorised personnel It is the owner s responsibility to ensure that normal maintenance inspections are carried out at regular inter vals as recommended in the maintenance section of this manual Australian Monitor reserves the right to refuse COMPANY NAME Ax Australian Monitor WARRANTY REGISTRATION IMPORTANT Please complete this card and return it immediately after unpacking the product This card is to be sent DIRECTLY to Austrailan Monitor NOTE Warranty is effective ONLY upon feceipt of this card warranty service where the owner fails to take reasonable care in use and maintenance of the amplifier To validate this warranty the original Purchaser must complete and mail the warranty registration card to Aus tralian Monitor at the above address within fourteen days of purchas
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