QPX1200 Manual - Hz Sound Systems
Contents
1. is plenty of rear ventilation and the air is not recycling b Rack mounting Ears are provided for both front and rear support a choice of mounting position is given on the front brackets either proud amp level with the front panel or sunk by 20mm and flush with the front escutcheon c Care is required when installing these units in a rack It is advised to put the Rack on its back then place all the equipment being fitted into it before fitting retaining bolts to avoid unnecessary handling damage Rear support brackets are strongly recommended to be used on each unit to avoid transit damage FITTING A POWER LEAD amp PLUG The wires in the IEC CEE mains lead are coloured Earth Green Yellow Neutral Blue Live Brown As these colours may not correspond with the colour markings identifying the terminal in your plug proceed as follows Green Yellow wire must be connected to the terminal which is marked with the letter E or coloured Green Brown wire must be connected to the terminal which is marked with the letter L or coloured red Blue wire must be connected to the terminal which is marked with the letter N or coloured black 2 CONNECTIONS At the back of the amplifier you will find the following connection sockets A Mains inlet To connect the unit via a mains lead to the mains power supply B Input jacks Inputs to the amplifiers C Output XLR s For connection to loudspeaker Also on the back of the amplifier2. DUAL CHANNEL AUDIO POWER AMPLIFIER OWNERS MANUAL CE 96 FF SOUND SYSTEMS Hz INTERNATIONAL LTD COMBE HOUSE STOKE ST MICHAEL BATH SOMERSET ENGLAND CONTENTS INSTALLATION Unpacking Siting the power amplifier 2 3 Connections 4 Fitting a mains plug OPERATION 1 POWERING UP 2 SELECTING MODE 3 PEAK INDICATOR 5 TRIP INDICATOR AMPLIFIER MAINTENANCE TECHNICAL DATA FAULTS AND THEIR LIKELY CAUSES INSTALLATION UNPACKING Although the power amplifier is a rugged piece of professional audio equipment and is heavy it is also a high specification modern electronic assembly and should be handled with care The packaging of the unit is specifically designed to safely transport this product In the unlikely event of the product requiring servicing this packaging is the safest way to transport it All units are factory set for 230v operation Units factory made for 110 120V supply are clearly marked on the back and should not be connected to any higher voltage power source SITING THE POWER AMPLIFIER This power amplifier has been designed for rack mounting use in a Racking enclosure made to BS5954 IEC297 or Din 41494 standards a The unit must be mounted in the horizontal position with clear cool air flow of 10cm around each air vent DO NOT STAND OR USE RACKS NEAR HEATING DUCT OUTLETS APPLIANCES OR RADIATORS If the rack is placed in an enclosed area cupboard etc make sure that there
3. The peak powers are short term maximum peak powers All other power measurements are long term continuous tone FREQUENCY RESPONSE 3 5 Hz 22 kHz Odb 3db INPUT SENSITIVITY DAMPING FACTOR gt OdBm 0 775v 100 100Hz DISTORTION 0 05 1Khz INPUT IMPEDANCE 35Kohms NOISE LEVEL 95dBm CONTROLS FRONT CONTROLS REAR Power On Off Green Neon rocker switch Channels 1 2 8 4 rotary volume controls amp associated channel clip indicators bridge mode indicators fan run indicator 2 fault indicators 2 Bridge mode switches 2 mono stereo mode switches PROTECTION Individual channel protection disconnects speakers when 800mV DC is present on output Fuses also provide short circuit protection THERMAL Automatic shutdown 150 deg C Auto reset COOLING 2 fans speed change switched on at 50 deg C INPUTS 1 IEC Mains socket for A C input 8 stereo input link jacks balanced line 2 per ch OUTPUTS 4 XLR male sockets 1 per channel MAINS FUSE 12 5A HRC 20mm POWER FUSES 4x10A 20mm internal SIZE 483 X 90 X 290 19 x 3 5 x 11 WEIGHT 17Kg 38lbs MAINS SUPPLY 240 220v or 120 110v A C 50 60 Hz 1 4KVA full power FAULTS AND THEIR LIKELY CAUSES Although the greatest care has been taken in the manufacture of the power amplifier the possibility remains that faults could occur during use or difficulties could be experienced during initial installation The cause however will
4. ht In extreme overload conditions it may come on but is usualy proceeded by very heavy distortion If this happens then turn down amplifier volumes then wait until the amplifier has cooled indicated by cold air coming out of the air outlet turn the amplifier volumes back to a reasonable setting taking note of the peak indicators If the problem persists firstly the cooling arrangement for the amplifier should be checked i e is the air flow obstructed by something against the grilles or is the amplifier enclosed in a sealed rack with no air vents If the trip light fails to extinguish after 30 seconds from cold switch on then there is an internal fault in the amplifier and the relevent speaker s have been disconnected to protect them Advice should be sought from your dealer AMPLIFIER MAINTENANCE The amplifier contains no use serviceable parts inside Maintenance should be mainly preventative taking care to follow previous instructions to ensure long term reliability Due attention should be paid to the condition of all soeaker and mains interconnection leads and connectors If required the outside of the amplifier can be cleaned using a damp lint free cloth Do not clean using solvents detergents or abrasives TECHNICAL SPECIFICATION POWER OUTPUT QPX1200 Load Per Channel lt 0 1 lt 5 PEAK 8ohm 210 230 360 4ohm 300 320 560 8Q bridged 590 685 990 TEST PERIMETERS Powers in watts r m s per channel using 1 kHz tone
5. rarely be found to be internal to the amplifier Below is a list of symptoms and possible causes Some of the suggested causes may appear obvious but they can be easily overlooked Under no circumstances should you open the amplifier this is dangerous will expose high voltages and will invalidate all rights under the guarantee 1 After turning on the power switch the power indicator does not light The mains plug is not pushed far enough into the amplifier There is not supply at the mains socket Check using an alternative electrical appliance The mains fuse is broken located on the rear of the amplifier replace using 12 5A 20mm fuse 2 When volume controls are advanced no sound is heard Wait 10 seconds amplifier may not be stabilised after switch on No input signal connected to input socket No speakers connected to output sockets Mono input signal not connected to correct channel Either move input plug to other channel or select mono mode 3 Even when the output is low the output sounds distorted The speaker leads are shorted either due to faulty connection of plug or damaged cables 4 Output distorted at medium volume setting Amplifier is running too hot ensure free flow of cool air into and out of the unit see section a of Siting the power amplifier 5 Trip indicator is lit and no sound is heard Unit has overheated Ensure free air flow into and out of the unit The amplifier will re
6. ready for use Before attempting to operate it however it is advisable to familiarise yourself with the functions of the controls and the significance of the indications 1 Power switch Isolates unit from the line supply 2 Power on When illuminated indicates AC power is applied to unit 3 On Indicates the amplifier is in operation 4 Trip Indicates dc voltage present on amplifier output or amplifier has reached an excessive temperature 5 Bridge ldicates that bridge mode has been selected 6 L R Peak Indicates onset of distortion 7 L R Level Sets the gain of each channel of the amplifier PEAK INDICATOR When the channel peak indicator lights it is indicating full power of the amplifier and the onset of distortion It not recommended to allow these to light continuously because although it sounds undistorted to the ear long term damage to the loudspeakers amp horns may occur Reduce your input level so the lights flash occasionally If this is not enough volume then you are underpowered for your application and should consider increasing your power amp size before damage occurs to the rest of your system POWERING UP You can turn the amplifier on or off either at the mains supply socket or by using the green neon rocker switch on the left hand side of the front panel Please note it is good practice to turn down the volume controls during switch on as precaution against speaker damage Which can be caused by in
7. se and become void Evidence of the date of purchase invoice receipt or finance agreement must be produced at the service department to obtain the benefit of this guarantee Any carriage charges relating to the guarantee will be the responsibility of the purchaser This guarantee applies to the original purchaser only and the equipment must have been purchased or financed from new the guarantee cannot be assigned or transferred Any defective part that has been replaced shall become the property of the company and the right is reserved by the company to replace the equipment or repair it at the option of the company This guarantee applies to equipment purchased and used within the E E C The importers of equipment in non E E C countries are responsible for the guarantee of this equipment Parts required under guarantee are free Shipping charges for components will be charged at cost Knobs potentiometers switches and chassis mount connectors are not covered under the terms of this guarantee The guarantee does not cover equipment that is in industrial use or which are the subject of rental or hire agreement The guarantee shall become void if the equipment is at anytime used on any supply circuit or voltage range other than that specified on the equipment THIS GUARANTEE DOES NOT IN ANY WAY AFFECT YOUR STATUTORY RIGHTS AS A CONSUMER WITHIN THE E E C
8. set itself when cool Or the amplifier has developed an internal fault please consult your dealer As a general rule jack plugs and sockets are very reliable especially if they are regularly connected and disconnected In situations where they are subject to prolonged static use it is good practice to clean the plugs and to clean the sockets by taking a new plug and waggling it in amp out this will stop any build up of any corrosion 7 GUARANTEE YOUR EQUIPMENT IS GUARANTEED FOR A PERIOD OF TWELVE MONTHS TAKEN FROM THE DATE OF PURCHASE OF THE PRODUCT AGAINST ANY DEFECTS DUE TO FAULTY MATERIALS OR FAULTY MANUFACTURING DURING THIS PERIOD REPAIRS TO THE EQUIPMENT WILL BE CARRIED OUT WITHOUT CHARGE FOR LABOUR OR MATERIALS BY ANY AUTHORISED DEALER OR THE FACTORY SUBJECT TO THE FOLLOWING CONDITIONS 1 The fault must be entirely due to faulty materials or faulty manufacture 2 The defect must not have been caused by bad installation accidental damage misuse or failure to comply with the instructions given in this users manual 3 The equipment must be used solely for audio applications and is subject to fair wear and tear for commercial usage 10 _ 12 If at any time during the guarantee period part or parts of the equipment are replaced with a part or parts not supplied or approved by us or if the equipment has been dismantled or repaired by any person not authorised by the us then guarantee shall immediately cea
9. stant high level feedback from an open channel mixer amp mic or system instability On initial switch on the trip indicator will light this should go out after a few seconds when the amplifier supplies have stabilised It is not recommended to switch the amplifier on and off rapidly several times over a short period MONO OR STEREO MODE Select either mono or stereo mode can be made at any time using the button at the rear of the unit In the stereo mode the left and right channels behave independently In the mono mode the left and right input signals are summed together and halved and fed to both left and right amplifiers Mono mode is indicated by the depressed button on the rear of the unit BRIDGE MODE Bridge mode can be selected by using the button at the rear of the unit the selection will be indicated on the front by the yellow lamp The CH1 amp CH3 INPUTS are the only operative inputs and the CH1 amp CH3 VOLUMES are the only operative gain controls for each of the bridged pairs The total power of either of the amplifier pairs can then be developed into an 8 ohm load connected positive to pin 2 on the CH1 OUTPUT XLR and negative to pin 2 on the CH2 OUTPUT XLR or similarly CH3 OUTPUT XLR and negative to pin 2 on the CH4 OUTPUT XLR PLEASE NOTE IF NOT SURE ABOUT THE USE OF THIS FUNCTION SEEK PROFESSIONAL ADVICE FROM YOUR DEALER TRIP INDICATOR Except on switch on this indicator should never lig
10. you will find Mains fuse 12 5 HRC 20mm Earth Tie Switch Couples or de couples the chassis ground to avoid ground loop hum when racking these units Mono mode switch For switching between mono and stereo modes Bridge Mode switch For switching between normal and bridge mode ZI Qn INPUT CONNECTIONS Connecting the input signals Input signals maybe connected to to the jack inputs of each of the four channels The signal may come from any suitable line level output e g mixer or another amplifier link output All input connections must use shielded screened cables DO NOT CONNECT WITH SPEAKER CABLES The inputs are electronically balanced for those who require this facility with the tip of the jack being hot and the ring cold or balanced line and the sleeve ground However they can be used unbalanced with standard mono jack plug A link jack input is provided on each input channel so that any of the four channels can be joined together or linked down to another power amplifier in the rack OUTPUT CONNECTIONS Connecting the output signal Output connection to loudspeakers is made from the XLR output of each channel Typically on the XLR outputs Pin 1 is Ground Pin 2 is Hot amp Pin 3 unused POWER CONNECTION Connecting the mains lead Fit the female plug of a mains lead into the connection socket on the amplifier and the male plug into a suitable mains supply socket OPERATION Your QPX1200 amplifier is now
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