User manual AUSTRALIAN MONITOR ACM250

[. . . ] 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. Protect LED A feature of the ACM250 is high temperature protection. In most applications, the internal cooling fan will most probably never switch on. [. . . ] Do not plug an unbalanced microphone in any amplifier or mixer when phantom power is switched on. Line Output The balanced XLR line level output provides a maximum of 700mV to allow for connection to up to 6 power amplifiers. Simply run a balanced cable from the line out of the ACM250 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 75mV @ 47K ohms. Input 6 has an input sensitivity of 300mV @ 47K 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 ACM250 include: Evacuation Tone (to Australian Standard AS2220. 1. 2) Alert Tone (to Australian Standard AS2220. 1. 2) Bell Tone Pre-Announce Chime Muting A VOX muting card is installed in the ACM250. 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). Fuse Sizes Mains, 240 VAC: 6 Amperes Slow Blow DC: 10 Amperes Slow Blow Important Safety Information 1. Save the carton and packing material even if the equipment has arrived in good condition. [. . . ] Do not parallel- or series-connect an amplifier output with any other amplifier output. Audio Telex Communications Pty Ltd is not responsible for damage to loudspeakers for any reason. Never connect a "hot" (red) output to ground or to another "hot" (red) output!The power cord of equipment should be unplugged from the outlet when left unused for a long period of time. [. . . ]