User manual AUSTRALIAN MONITOR CONTRACTOR

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[. . . ] Australian Monitor PROFESSIONAL AUDIO POWER AMPLIFIERS CONTRACTOR and opof 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 amplilier. Safety Precautions and Labelling The rear panel of the unit has a number of markings and inlemationally recognized symbols related to the hazards and precautions that should be taken when operating MAINS connected equipment. REFER SERVICING TO QUALIFIED PERSONNEL ONLY The user should not attempt to service the unit. Only qualified and knowledgeable personnel familiar with the intemal wo. kings of the unit should attempt any repair, servicing or authorized modification to the unit. The presence of a LIGHTNING FLASH with an arrowhead 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 allows When switching the amplifier OFF wait the ICS circuit to reset. Level Matching ' The normal position for lhe attenuator is the '0 dB' position (tully clockwise, no attenuation). Tuming the attenuator back (anticlockwise) reduces the input sensitivity by the amount marked on the attenuator scale. lf full power output is required you should operate your amplifier with the front panel attenuator above the -15d8 Before making any connections to your amplifier obssrve the following: 1. Ensure the mains voltage supply matches the label on lhe rear panel of your amplifier. Ensure that all system grounds (earlhs) are connected to a common point. Avoid powering several pieces of equipment from multiple power sources that may be separated by large distances. Check the continuity of all interconnecting leads to your amplilleq ensure thatthere are no open orshort circuited conductors. 4. Ensure that the power handling of your load (speakers) can adequately cope with the power output of the amplifier. position, otherwise clipping of the input circuitry and some resultant distortion will occur before full output power is achieved. Sensitivity Your amplifier is a linear device operating with a fixed inpulto-output voltage gain. The maximum output voltage swing is determined by: the applied mains voltage, the load, load type, and the duty cycle of the applied signal. The voltage gain facior of your amplifier is: (or 25dB) c300 19. 9 Before operating your amplifier, ensure lhat: - the attenuators are at the OFF position (fully anticlockwise). - the power switch is OFF. - the GROUNO LIFT Switch is not engaged (should be in the 'out' position). - the BRIDGE Switch is not engaged unless you are running the amplifier in bridged mode. c600 c800 Opal Powering Up REMEMBER The amplilier should be the last piece of equipment that you tum ON, and the first piece of equipment that you turn OFF. We recommend turning the attenuators on your amplilier down when fuming the unit on. lPA12 '12O2 Opal2802 C12OO PA3 PA6 PA8 29. 0 37. 0 45. 25 x 19. 9 x 29. 0 x x x x (or 27dB) (or 31. 36d8) (or33. 11d8) (or 25dB) (ot 27dB) The input sensitivity for your amplifier when the attenuator is at the '0 dB' attenuation position (fully clockwise) is nominally: +4. 0d8 (1. 23 volts) for raled power into an I ohm load. Each channel of your amplilier has a balanced input impedanceof25k Ohms (25, 000) and should notpresent a difficult load for any signal source. The signal source (i. e. the equipment feeding the amplifier) should have an output impedance of 2k Ohms When you power up, your amplifier goes through an establishment period before it will accept signal. The lnrush Cunent Supression (lCS) circuit is in operation for the tirsl 0. 5 seconds. This limits the mains cunent to prevent 'nuisance-tripping' of circuit breakers caused by high starl-up cunents. /tu Operation l3 (2, 000) or lower to avoid unwanted highfrequency loss in the cabling. lnput overload occurs at +20. 5d8u (8. 25 volts). See the specification section for more detailed informa- There are thr'ee things you can do to avoid earth loop problems: 1 . Ensure your niains power for the audio system is . quiet' tion. i. e, without'equipment on il such as air-conditioning, refrigeration or lighting which wilt generate noise in thl earth circuit. Ensure all equipment within lhe system shares a common ground or safety earth point. This will reduce the possibility of circulating eartl cunents, by referencing equipmentto the same ground potential. Ensure that balanced signal leads going to the amplifier are connected to earth at one end only. Hum Problems Mctstequipment is designed for minimum hum when used under ideal conditions. When connected to other equipment and to safety earth in an electrically noisy environment problems will often occur. [. . . ] The time taken for this to happen will depend on the environment and the amount of use. /tu , '7 8. Wananty Australian Monitor Pty Ltd, oi 29 Hope St, Ermington, Sydney, N. S. W. 21 15 Australia, wanants the original purchaser of each amplifier (purchased from an authorised Australian Monitor dealer) that it will be free from defecls in material and workmanship for the whole warranty period from the original date of purchase. Australian Monitorwill, at its option, repair or replace any unil or component covered by this wananty which be_ comes defective or malfunctions under normal use and service during the period ofthis warranty, at no charge for parts or labour to the original owner. [. . . ]

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