User manual AUSTRALIAN MONITOR AMIS250P

[. . . ] 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 on to cool the amp down and then switch off again. 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. [. . . ] 4 The "+" for 4 ohm speaker loads (use with common) COM 25 70 Common or "-" for 25v or 70v speaker loads (maximum load of 20 ohms at 70v) The "+" for 25v line speaker loads (use with common) The "+" for 70v line speaker loads (use with common) Please ensure that the correct "Common" is used. Low impedance and 25/70v 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 70v line load should not fall below 20 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 distributed (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. Pin 3: Cold, -, Negative Fuse Sizes Mains 115 VAC - 8 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. Do not spill water or other liquids into or on the unit, or operate the unit while standing in liquid. Make sure power outlets conform to the power requirements listed on the back of the unit. 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. [. . . ] 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 Audio Inc is not responsible for damage to loudspeakers for any reason. Never connect a "hot" (red) output to ground or to another "hot" (red) output! [. . . ]