User manual AUSTRALIAN MONITOR ACM120XL

[. . . ] ACM120XL 120w Mixer Amplifier Operating Manual ACM120XL, 120 Watt Mixer Amplifier Product Description The ACM120XL is a 120 watt mixer amplifier designed for commercial installations. It features 8 microphone/line input channels and can be used for either low impedance (4 or 8 ohm) or 70v/100v line speaker systems. A host of unique features including multiple levels of muting, a VOX relay output and VCA master level control make the ACM120XL a very flexible amplifier. The unit can be mounted in a standard 19" equipment rack (rack ears supplied) or it can be used on a shelf or table. Front Panel Features Microphone/Line Level Controls The level controls for the 8 inputs are labeled Ch 1-Ch 8. [. . . ] When any of the 4 tones are activated, inputs 4 to 8 are muted. Inputs 1, 2 and 3 on the other hand will mix with the tones and can be used at the same time. Insert Point The ACM120XL includes an Insert Point to allow for connection of signal processors such as equalisers, compressors or Feedback Exterminators. The Insert Point is located (electronically) between the mixer and power amplifier sections of the ACM120XL. It allows for the "mixed" output of the ACM120XL to be processed externally and then returned to the power amplifier section of the ACM120XL. The Insert Point is a 3 conductor (Tip, Ring, Sleeve) socket which accepts a standard stereo 6. 35mm (1/4") jack. The one jack allows for signals to be "sent" to the processor and then "returned" to the power amplifier. This is the return signal from the processor Ring Mix Output. This is the signal from the mixer stage which is to be sent to the processor Sleeve This is the ground connection When an external processor is used via the insert point, it only affects the power amplifier section of the ACM120XL. The tape output remains unprocessed. Tape Output The ACM120XL includes a tape recorder output with dual RCA connectors. Although the output signal is mono, dual RCA's are provided to allow for easy connection to domestic or professional tape recorders. The output level of the tape output is governed by the 8 input controls of the ACM120XL. The front panel master control does not affect the tape output. In a practical situation, this allows for "on the fly" changes to the power amplifier level (to turn the PA system up or down) without affecting the signal being recorded. Line Output A 3 pin male XLR socket is provided to allow for connection to additional power amplifiers. The line level signal is the mixer output of the ACM120XL allowing this "mixed" signal to be split to other amplifiers. This is most commonly used when more power (than the 120 watts of the ACM120XL) is required. In this situation, a standard microphone lead is used to connect the line output of the ACM120XL to the line input of a power amplifier. The speaker load then needs to be split into two (one for each amplifier) making sure that each amplifier is driving no more than it's recommended load. The line output is a balanced 700mV signal which can be used to connect (daisy-chain) up to 6 power amplifiers. If more than 6 amplifiers are required, a distribution amplifier is recommended. Microphone Inputs The ACM120XL includes 8 microphone and line inputs. The microphone inputs are via 3 pin XLR female sockets. The microphone inputs are 200 ohm and are suitable for a wide range of dynamic or electret microphones. When using electret microphones, phantom power should be enabled for those particular inputs. [. . . ] 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. If the unit is used in an extremely dusty or smoky environment, the unit should be periodically "blown free" of foreign matter. Removing the cover will expose you to potentially dangerous voltages. There are no user serviceable parts inside. [. . . ]