User manual AUSTRALIAN MONITOR ACM604

[. . . ] The Treble control allows the user to increase or decrease the amount of treble in the system. Generally, a small increase of the treble control makes a system sound `brighter'. If no treble cut or boost is required, the control should be left in the centre position. VCA Master Control For applications requiring remote level control, provision has been made on the rear panel of the ACM604 to connect an external 500-1K ohm pot for remote control of the master level of each amplifier. Power Switch & "On" LED The black rocker switch on the right hand side of the front panel is used to switch the amplifier on and off. When the amplifier is connected to an appropriate AC power source and is switched on, the blue on LED will illuminate. Signal LED's The four green "Signal" LED's located next to the On LED indicates that the ACM604 is passing audio. [. . . ] In other words, the speaker output section is directly behind the relevant front panel controls. Each of the four amplifiers in the ACM604 can work with 8 ohm and/or 70/100 volt line speakers systems. The various outputs are marked as follows: COM 8 COM 70 100 Common or "-" for low impedance speaker loads (8 ohms). Positive "+" for 8 ohm speaker loads (use with common) Common or "-" for 70v or 100v speaker loads (maximum load of 160 ohms at 100v) Positive "+" for 70v line speaker loads (use with common) Positive "+" 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 8 ohms or higher while the 100v line load should not fall below 160 ohms. When both outputs are used simultaneously, ensure that neither output is loaded to maximum. VOX Muting The ACM604 includes a VOX muting circuit which is independent for each amplifier. The unit is factory set so that input 1 of each amplifier has VOX priority over inputs 2 and 3 for that amplifier. Basically, when signal is present on input 1, audio from inputs 2 and 3 is muted. As mentioned, each amplifier is totally independent so the VOX circuit from one amplifier does not affect any of the other amplifiers. Muting can be defeated per amplifier via an internal jumper labelled JP2 (located on the top board behind inputs 1 and 2. The ACM604 is shipped with muting enabled (jumper towards the front panel of the amplifier). To disable VOX muting per amplifier, simply move the relevant jumper (from amplifiers 1, 2, 3 or 4) so that it is closest to the back panel. Optional ATC5489 Tone Generator/Vox Relay Card An optional Tone Generator/Vox Relay card is available for the ACM604. Each card suits one amplifier within the unit so up to 4 cards can be installed. The card slots in between the input terminal strip and the output terminal strip on the rear panel of the amplifier. Simply remove the two screws and blanking plate, slide in the ATC5489 and replace the screws. The card provides a 4 tone generator module (Pre-Announce, Bell, Alert and Evacuate tones) per amplifier and also provides a VOX triggered relay output per amplifier. Full installation and operation instructions are included with the ATC5489. 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. [. . . ] Service Information Equipment should be serviced by qualified service personnel when: A. 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 by Audio Telex Communications Pty Ltd, Sydney, Australia A. B. N. 78 001 345 482 Inc in NSW www. audiotelex. com. au Export Sales & 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: ho@audiotelex. com. au Sydney (NSW & ACT Sales) Private Bag 149, Silverwater NSW 1811 149 Beaconsfield Street, Silverwater NSW 2128 Ph: (02) 9647 1411 Fax: (02) 9648 3698 E-mail: nsw@audiotelex. com. au Adelaide (SA & NT Sales) P. O. [. . . ]