AUSTRALIAN MONITOR ACM120XL Panduan Pengoperasian - Halaman 5

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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. Phantom power (15v DC) is

available on all XLR inputs and can be switched on or off per channel. To enable phantom power on a particular input

channel, simply flip (on the rear panel) dip switch 3 (for that channel) to the on position.

Line Inputs

The ACM120XL includes 8 microphone and line (auxiliary) inputs. The line inputs are via dual RCA connectors per

channel. Although the ACM120XL is a mono amplifier, dual RCA's are provided to allow for easy connection to

domestic or professional line sources. The line inputs are suitable for a wide range of products including tuners, cassette

decks and CD players. As the output signal from line sources can vary immensely, four sensitivity settings are available

per line input. These settings are adjustable via dip switches 1 and 2 per channel. The options are:

Dip Switch 1 off, 2 off

Dip Switch 1on, 2 off

Dip Switch 1off, 2 on

Dip Switch 1on, 2 on

Dip Switch 3 is for the XLR microphone input and switches phantom power on and off (see "Microphone Inputs").

Simultaneous Use of Mic and Line Inputs Per Channel

The ACM120XL has 8 microphone and 8 line inputs. In most situations only the XLR or the dual RCA's would be used

on a particular channel. In some circumstances however, more channels may be needed in which case both the XLR and

RCA inputs can be used simultaneously per channel. When using both a mic and line input per channel, both inputs are

mixed and are controlled simultaneously via the channel level control.

Line Input Sensitivity

Four sensitivity adjustments are provided for each line input. See "Line Inputs".

Phantom Power

15v DC Phantom Power is selectable per XLR microphone input. See "XLR Microphone Inputs". Phantom Power should

only be used on balanced electret microphones. Using phantom power with unbalanced microphones may damage the

microphone.

Muting

The ACM120XL includes an advanced priority/muting system which is installer adjustable. When shipped, the

ACM120XL has three priority inputs. From the factory, Input 1 has overall priority and mutes inputs 2-8 when signal is

present. Input 2 has secondary priority and mutes inputs 3-8 when signal is present. Input 3 has a third level of priority

and mutes inputs 4-8 when signal is present. Inputs 4-8 have no priority and are mixed. All muting in the ACM120XL is

activated by signal (VOX) whether it be on the XLR or RCA inputs.

A number of muting options are available and can be altered via a series of internal links located on the front mixer board

behind inputs 1and 2.

90mV at 47K ohm

9dB pad (cut)

12dB pad (cut)

15dB pad (cut)