User manual AUSTRALIAN MONITOR AMIS250

[. . . ] Adjusting the treble control in a clockwise direction will provide up to 9 dB of treble boost @ 10kHz. Adjusting the treble control in a counter-clockwise direction will provide up to -9 dB of treble cut @ 10 kHz. Master Output Control The Master level pot controls the overall output level of the amplifier depending on the levels set for the individual input channels as detailed above. Start with the control set to level 0 and turn clockwise until the desired output level of the amplifier is reached. Power Switch This switch controls the switching of AC power to the amplifier. A blue `On' LED will indicate whether the amplifier is switched on or off. [. . . ] Simply run a balanced cable from the line out of the AMIS250 to the line input of the power amplifier. Pin connections are: pin #1-earth; pin #2-signal (high, +); pin #3-signal (low, -). Tape Output Dual RCA output connectors provide a line level output with a maximum of 350mV into 10K Ohms which is ideal for a connection to most standard tape recorders. This output is sourced before the master gain control and as such, the tape output level is not influenced by the operation of the master gain control. Microphone Inputs The mic input sensitivity is 1mV @ 200 ohms. Pin connections are: pin #1-earth; pin #2-signal (high, +); pin #3-signal (low, -). Reading from left to right across the rear panel, the connection are for microphone inputs 6, 5, 4, 3, 2, & 1 respectively. Line Inputs Line inputs 1, 2, 3, 4, & 5 have an input sensitivity of 150mV @ 100K ohms. Input 6 has an input sensitivity of 300mV @ 220K ohms making it suitable for high level inputs such as a CD player. Reading from left to right across the rear panel, the connections are for inputs 6, 5, 4, 3, 2, & 1 respectively. Other Features Tone Generator Four separate tones are available from the in-built tone generator board. All four tones can be activated individually via a contact closure connected to the screw terminals on the rear of the amplifier. To activate the bell chime for example, just run a pair of wires from the Tone generator common and the Bell terminal to an external switch. Activating the switch, or closing the pair of wires, will activate the bell. When any tone is activated, all inputs (except for inputs one and two) will automatically mute. To adjust the level of the tone generator, disconnect the power lead, remove the amplifier lid and locate the pot labeled R6. Tones available on the AMIS250 include: Evacuation Tone Alert Tone Bell Tone Pre-Announce Chime Muting A VOX muting card is installed in the AMIS250. This feature provides automatic muting of some channels when others are active. It is normally used so that a paging microphone can have priority (by muting) over background music. VOX muting is available from channels 1 and 2 meaning that any signal on channels 1 and 2 (mic or line) will mute channels 3, 4, 5 & 6. The muted channels will automatically ramp back up to normal volume when the signal on channels 1 and/or 2 is no longer active. To disable the VOX muting, disconnect the mains power lead and remove the lid of the amplifier. Looking down from the front of the amplifier, a three position jumper (labeled JP2) is located just to the left and behind the level pot for channel 1. (The factory setting is with VOX enabled with the jumper on the middle and right pins). 600 Ohm Telephone Input The 600 ohm transformer balanced Telephone Input is paralleled with input 2. If telephone paging is required the XLR & dual RCA inputs should not be used as these inputs will be summed with the Telephone Input into channel 2. The front panel level control will set the gain for the Telephone Input. Insert Point The AMIS250 includes an Insert Point to allow for connection of signal processors such as equalisers, compressors or Feedback Exterminators. [. . . ] 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. Never connect a "hot" (red) output to ground or to another "hot" (red) output! [. . . ]