AMIS250P Operating Manual AMIS250P, 250 Watt Power
Contents
1. 14 Do not remove the cover Removing the cover will expose you to potentially dangerous voltages There are no user serviceable parts inside 15 Do not drive the inputs with a signal level greater than that required to drive equipment to full output 16 Do not connect the inputs outputs of amplifiers or consoles to any other voltage source such as a battery mains source or power supply regardless of whether the amplifier or console is turned on or off 17 Do not run the output of any amplifier channel back into another channel s input Do not parallel or series connect an amplifier output with any other amplifier output Australian Monitor is not responsible for damage to loudspeakers for any reason 18 Do not ground any red hot terminal Never connect a hot red output to ground or to another hot red output 19 Non use periods The power cord of equipment should be unplugged from the outlet when left unused fora long period of time 20 Service Information Equipment should be serviced by qualified service personnel when A The power supply cord or the plug has been damaged B Objects have fallen or liquid has been spilled into the equipment C The equipment has been exposed to rain D The equipment does not appear to operate normally or exhibits a marked change in performance E The equipment has been dropped or the enclosure damaged Engineered in Sydney Australia www australianmonitor2. com au International Sales amp Corporate Head Office Private Bag 149 Silverwater NSW 1811 149 Beaconsfield Street Silverwater NSW 2128 Australia Ph 61 2 9647 1411 Fax 61 2 9748 2537 E mail international australianmonitor com
3. Ay Nastala onito Clever Features Contractor Friendly AMIS250P 250w Power Amplifier Operating Manual AMIS250P 250 Watt Power Amplifier Product Description The AMIS250P power amplifier is designed for commercial installations It can be used for either low impedance 4 ohm or 70 100v line speaker systems It operates on 230 VAC 50Hz and may be desk or rack mounted The AMIS250P features a line level input with parallel output and is normally used with mixers mixer amplifiers or other power amplifiers The AMIS250P delivers 250 watts into a load of 4 ohms 70 or 100 volt line The AMIS250P also features 24 volt DC operation This symbol is intended to alert the user to the CAUTION presence of uninsulated dangerous voltage within the product s enclosure that may be of RISK OF ELECTRIC SHOCK sufficient magnitude to constitute a risk of electric DO NOT OPEN shock to persons CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK This symbol is intended to alert the user to the presence of important operation and main NO USER SERVICEABLE PARTS INSIDE tenance servicing instructions in the literature accompanying the appliance REFER SERVICING TO QUALIFIED SERVICE PERSONNEL Caution To prevent electric shock do not use this polarized plug with an extension cord receptacle or other outlet unless WARNING dodimni can be fully inserted to prevent blade ex TO REDUCE THE RISK OF FIRE OR ELECT
4. IERIG Wr Aiten Tipa Soi Pee P O Eri dT AC Power Inlet The operating voltage is 230 240 VAC 50 Hz The 3 pin IEC power inlet is located on the bottom left of the rear panel and accepts a standard mains power lead fitted with an IEC connector Before plugging in a power lead please check the rear panel of the amplifier to ensure that the voltage switch is set correctly for your part of the world The inlet is equipped with an in built AC fuse holder fitted with an 4 Amp slow blow fuse plus a spare fuse Please ensure that the mains power cord is disconnected before attempting to check or replace this fuse Power consumption is 400 VA max 230V 240V Slide Switch The operating voltage of the amplifier is user selectable between 230V and 240V via a slide switch located on the right of the AC inlet This switch should be set to match the AC voltage of your country 24 Volt DC Power Inlet The AMIS250P feature optional 24VDC power to run off a battery back up if required This is connected via the rear terminal strip The front panel Power Switch will not switch DC power on or off in DC operation In this mode the amplifier is always on Speaker Output Terminal Strip Located on the top left of the rear panel is the speaker output terminal strip Reading from left to right the connections are COM Common or for low impedance speaker loads 4 ohms 4 The for 4 ohm speaker loads use with common COM Comm
5. RIC SHOCK To prevent electric shock match wide blade of plug to DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE wide slot fully insert Front Panel Features AVIS 2So0P PRET etre BH A Australian Monitor LL N INSTALLATION SERIES Power Switch The black rocker switch on the right hand side of the front panel is used to switch the amplifier on and off The up position is on When the amplifier is connected to an appropriate AC power source and is switched on the blue power LED will illuminate This switch will not switch DC power on or off in DC operation In DC operation mode the amplifier is always on and the blue power LED will always be illuminated On LED The blue On LED above the power switch will illuminate when the amplifier is connected to mains power and is switched on In 24vdc operation the LED will always be on Signal LED The green Signal LED located next to the On LED indicates that the AMIS250P is receiving audio signal via its line level input The signal LED is a simple method to trouble shoot installations especially in multi amplifier projects At a glance the signal LED will indicate that audio is reaching the amplifier Protect LED A feature of the AMIS250P is high temperature protection In most applications the internal cooling fan will most probably never switch on When used with demanding speaker loads or in difficult operating environments the fan may regularly switch o
6. d split to other amplifiers In some projects the same input may be looped through to multiple amplifiers using this method Up to 6 amplifiers can be looped together without any noticeable loss in level A distribution amplifier should be used when more than 6 amplifiers need to be looped The XLR s are wired as follows Pin 1 Shield Pin 2 Hot Positive Pin 3 Cold Negative Fuse Sizes Mains 230 VAC 6 Amperes Slow Blow DC 2 x 10 Amperes Slow Blow Notes The DC fuse is located on the circuit board This is a feature of the AMIS series amplifier which is equipped with a current limiting circuit preventing excessive DC current thus eliminating the risk of blowing high tensions fuses In the unlikely event that the DC fuse actuates the output transistors should be checked as it is probable that the amplifier has been subjected to very extreme conditions Important Safety Information 1 Save the carton and packing material even if the equipment has arrived in good condition Should you ever need to ship the unit use only the original factory packing 2 Read all documentation before operating your equipment Retain all documentation for future reference 3 Follow all instructions printed on unit chassis for proper operation 4 Do not spill water or other liquids into or on the unit or operate the unit while standing in liquid 5 Make sure power outlets conform to the power requirements listed on the back of th
7. e unit 6 Do not use the unit if the electrical power cord is frayed or broken The power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them paying particular attention to cords and plugs convenience receptacles and the point where they exit from the appliance 7 Always operate the unit with the AC ground wire connected to the electrical system ground Precautions should be taken so that the means of grounding of a piece of equipment is not defeated 8 Mains voltage must be correct and the same as that printed on the rear of the unit Damage caused by connection to improper AC voltage is not covered by any warranty 9 Have gain controls on amplifiers turned down during power up to prevent speaker damage if there are high signal levels at the inputs 10 Power down amp disconnect units from mains voltage before making connections 11 Never hold a power switch in the ON position if it won t stay there itself 12 Do not use the unit near stoves heat registers radiators or other heat producing devices 13 Do not block fan intake or exhaust ports Do not operate equipment on a surface or in an environment which may impede the normal flow of air around the unit such as a bed rug weathersheet carpet or completely enclosed rack If the unit is used in an extremely dusty or smoky environment the unit should be periodically blown free of foreign matter
8. n to cool the amp down and then switch off again This switching on and switching off is quite normal The Protect function is there to protect the amplifier from a high temperature problems which would only occur if the fan stopped working or became clogged up In this very rare occurance the protect LED will illuminate and the amplifier may shut down The amplifier will automatically restart once its internal temperature has fallen within safe limits If the protect LED illuminates it is best to switch the amplifier off let it cool down and then try it again If the protect LED illuminates again please contact the company who supplied or installed the equipment Rack Mounting The AMIS250P is supplied with rack ears attached to allow mounting within a standard 19 equipment rack As is the case with almost all audio products adequate ventilation and air flow is required When installing multiple AMIS250P power amplifiers within the one rack it is recommended that at least one rack unit of ventilation space is left between every two amplifiers For table or shelf mounting the rack ears can be removed using a screwdriver Once the rack ears are removed please reinstall the screws Rear Panel Features wv 1oey a Graii du m a A Ce ae ee a ee E j E _ i F ame Genre rt AC FUSE nee ee cht cht ch ol chs cn ASA 250W SB oc FUSE ily E E aq 5 1 m 1q m 1 Zz 104 38 A o POWER 154 CaN C E A BHOW
9. on or for 70v or 100v speaker loads maximum load of 40 ohms at 100v 70 The for 70v line speaker loads use with common 100 The for 100v line speaker loads use with common Please ensure that the correct Common is used Low impedance and 70 100v loads can be used simultaneously but please pay careful attention to the overall speaker load When used individually the low impedance load should be 4 ohms or higher while the 100v line load should not fall below 40 ohms When both outputs are used simultanously ensure that neither output is loaded to maximum Gain Control Located to the left of the XLR input output is a recessed screwdriver adjustable gain control The gain control is an input attenuation control normally used to match the amplifier to a wide variety of input signals In essence the amplifier is designed to receive a 700mv input signal however the level control can be used to increase the level for lower signals or decrease the level for higher input signals In normal use the gain control is used as a set and forget master level control for the amplifier XLR Audio Input and Parallel Output The AMIS250P includes both male and female 3 pin XLR connectors While the female is normally used as the input to the amplifier both XLR s are connected in parallel so either will work When signal is connected to one XLR the other XLR becomes a line level output allowing the input signal to be distribute
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