User manual AUSTRALIAN MONITOR AM3002

[. . . ] Australian Monitor AM3002 Ausbdlan Monitor "''. r. . r;-r ;\"/ [ ll H+, " -tr' -__:, vi:_. \-r LUI Operation Manual IMPORTANT! Please read carefully. This operation manual containsimponant information regarding safety precautions, installation, perfomance, operation and mainlenance of your AM3OO2 power amplifier. You should familiarize yourself with the contents manual before operating your amplifier. of this Safety Precautions and Labelling The rearpanelofthe unit hasa numberof martingsand internationally recognized symbols related to the hazards and precautions that should be taken when operating MAINS connecled equipmenl. The presenceof a LIGHTNING FLASHwith an aJrowhead containedwithinthe bounda ries of a n equilateraltriangle is intended to alertthe userthat dangerous uninsulated REFER SERVICING TO QUALIFIED PERSONNEL. NO USER SERVICEABLE PARTS INSIDE. The user should not attempt to service the unil. [. . . ] Faults can and do occur in mains connected equipment where the chassis can become "live" if it is not properly earthed. ln these inslancesthe fault in a "floating'(un-grounded) piece of equipment will look for the shortest path to ground which could possibly be your amplifiefs input. lf the fault current is large enough it will deslroythe input to your amplifier and look for the next available path, which may be you! amplifier down when turning the unit on. When you power up your amplifier, your amplifier goesthrough an establishment period before itwill acceptsignal. The lnrush Cunent Suppression (lCS) circuit is in operation for the first 0. 5 seconds. This limitsthe mains cunent to prevent "nuisance tripping" ofcircuit breakers. Ouring this period the THERMAL LED will flash red whilst the mains voltage gradually charges up the power supply. You will then hear dual relays "click", indicating mains is nov!, d ireclly applied tothe amplifier. While the ICS circuit operates there is also a 30dB mute on the signalinput. Aftertwo secondsthis mute will release, allowing any applied sjgnal to pass unattenuated. Before making any connections to your amplifier obserVethe following: 1. Ensurethe mains voltage supply matchesthe label on the rear panel of your amplifier (+/. 10olo). When s, witching the amplifier off, wait a couple of seconds before switchinglhe uniton again. Ensure that the power switch is OFF (UP) 3. Ensure that all system grounds (earths) are connected from a common point. Avoid powering equipment within a system from multiple power sources that may be separated by large distances. Checkthe continuity of all inlerconnecting leadsto your amplifier, ensure that there are no open or short circuited conduclors. Ensure lhal the power handling of your load (speakers) can adequately cope with the power oulput of the amplifier. Level Matching The normaloperating position forthe attenuator is the "0 dB" position (fully clockwise, no attenuation). Turning the attenuator back (anticlockwise) reduces the input sensitivity by the amount marked on the attenuator scale (dial). NOTE: lf full power output is required you should operate your amplifierwith the front panel attenualor above the -1 5dB position, otherwise clipping ofthe input circuitry end its resultant distorlion will occur before full output power is achieved. Very lmportant Dueto the high powerabilily ofthe AM3OOZ you need lo be aware that certein precautions need to be followed to ensure longevity of youramplifier: - Nevertum youramplifi eron unless all connections (inputs and speakers) havebeen made! Sensitivity Youramplilieris a lineardevice operatingwith a fixed input to output voltage gain (less aitenuation). The maximum output voltage swing isdetermined by the applied mains voltage, load, load type and the duty cycle ofthe applied signal. The voltage gain factor of youramplifieris: - Neverplug in a signal lead afferthe amplifierhas been turned on !Tum the unit offfirst. - Never drive the output into clipping if the load open circuit or there is no speaker load connected! is 53. 5times or 36d8. PoweringUp REMEMBER The amplifi ershould bethe lastpieceof equipmentthat you tum on and the @!piece of equipment that you The input sensitivity for your amplifier when the attenuator is at the "0" dB attenuation position (fully clockwise) is nominally: +3. 3dBu load. (1. 1 4volts in) forrated powerinto a 8 ohm 4 ohm turn off. +2. 2dBu (1. 00 volt in) for rated powerintoa load- We recommend turning the altenuators on your Australian Monitor /tu l4 Operation produces a voltage drop due to thewire's resistance. This voltage difference between the amp earth and source equipment earth appears to the amplifier's input as a signal and is amplified as hum. There arethree things you can do to avoid earth loop Each channel of your amplifier has a nominal balanced input impedance of 2SkOhms (@1kHz) and should not present a difficult load forany signal source. Yoursignal source (i. e. the equipment feeding the amplifier) should have an output impedance of 600 Ohms orlowerto avoid unwanted high frequency loss in the cabling. lnput overload occurs at +20. 5d8u (8. 25 volts). See lhe specification section for more detailed information. problems: 1 . Ensure your mains powerforthe audio system is "quiet" i. e. [. . . ] Thelime taken forthis to happen willdepend on the environment and the amount of use. The fan blades are accessible once the lids are removed and can be easily cleaned. You need only hold the fan rotor still and wipe the dust off the blades. Many users stall the fan and use compressed airto blow the dust off the fan blades. [. . . ]