User manual AUSTRALIAN MONITOR ACM60

[. . . ] Adjusting the bass control in a clockwise direction will provide up to 12 dB of bass boost @ 100 Hz. Adjusting the bass control in a counter-clockwise direction will provide up to -12 dB of bass cut @ 100 Hz. It is recommended to start with the bass control at the centre (0) position and adjust if necessary. Treble Control Setting this control in the centre position will give an overall flat treble response. Adjusting the treble control in a clockwise direction will provide up to 9 dB of treble boost @ 10kHz. [. . . ] While some of these microphones can operate from an internal battery, having phantom power available on the amplifier eliminates the need to regularly change batteries in the microphone. While phantom power is not required for the more common Dynamic microphones, it will not damage them providing that they are balanced. Do not plug an unbalanced microphone in to 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 ACM60 or ACM120 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 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 All four inputs are dual mic/line with microphone inputs being via a 3 pin XLR connector per channel The mic input sensitivity is 1mV @ 200 ohms. Pin connections are: pin #1-earth; pin #2-signal (high, +); pin #3-signal (low, -). Phantom power of +18 volts is available on all microphone inputs. Reading from left to right across the rear panel, the inputs are 4, 3, 2, & 1. Line Inputs All four inputs are dual mic/line with line/auxiliary inputs being via dual RCA connectors per channel. Line inputs 1, 2 & 3 have an input sensitivity of 75mV @ 47K ohms. Input 4 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 inputs are 4, 3, 2, & 1. Other Features Tone Generators 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. (located behind the Bass adjustment pot). This pot adjusts the level for all 4 tones. Tones available on the ACM60 and ACM120 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 ACM60 and ACM120. 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. [. . . ] Never hold a power switch in the "ON" position if it won't stay there itself!Do not use the unit near stoves, heat registers, radiators, or other heat producing devices. 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. [. . . ]