Owner's Manual

Table Of Contents

– 11 – AtlasIED.com

Specifications are subject to change without notice.

Owner’s Manual

AA120G & AA240G

Commercial Mixer Amplifier

1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.

Telephone: 800.876.3333 • Fax: 800.765.3435

Rear Panel

5. Mic Trim

This variable control allows fine tuning of the gain of Inputs 1-4. There is 20dB of variable gain available. The trim only

applies when the input is set to the “Mic” position on the DIP switch

6. Input 1 VOX Threshold Adjustment

Input 1 signal can be used to trigger or activate a mute command. When an input is set to Mute Receive via Switch B Input Mute Rec

section, the input associated to the switch will be muted when a signal is applied to Input 1 or when the Remote mute terminals are

shorted together (See Remote Mute). The VOX Mute Sensitivity Control adjusts how sensitive the mute circuitry from Input 1 reacts.

Rotating the VOX Sensitivity clockwise (CW) will lower the sensitivity, where a higher amplitude signal from Input 1 will be required to

trigger the mute send circuits. Fully Counter Clockwise (FCCW) will raise the sensitivity of the mute circuits, where a lower amplitude

signal from Input 1 is required to trigger a mute send. VOX Sensitivity trim range is from Off (FCW), On / Low 1.25mV to High 9FCCW)

40uV. Calibration of this control in conjunction with the microphone to be used is very important to assure the proper amount of signal

from the mic is enough to trigger the mute circuits. If it is not calibrated properly, the mute may not be triggered when a weak voice vs

a strong voice uses the mic.

7. Input 4 (Dual Function)

Input 4 can accept more than one type of audio signal. This input section has a 3 position Phoenix connector for Mic or Line input

signals and a 3.5mm stereo jack that is summed. The level to the amplifier mix is controlled by Input 4 level located on the front panel.

Note: Only one type of input signal can be applied at one time.

A. Balanced Mic / Line - Balanced Microphone or Line level signals connect to the (+), (–), and (G) terminals. To select between Mic or

Line input levels, refer to the DIP switch chart on the rear of the amplifier for feature assignment. If connecting an unbalanced line level

input, tie (short) the (G) and (–) terminals together for negative or ground connection and the positive or (+) signal to the (+) terminal

on the amplifier input. If the input is used in Mic mode, Phantom power for condenser type microphones is available in the DIP switch

settings on the rear panel.

B. Input 4 Stereo Summed - Input 4 consists of stereo 3.5mm summing inputs, suitable for connection to the output of iPod

, CD/DVD

players, etc.

8. Switch B Functions

• DP SW #1 - Input 6, this the input sensitivity selection between 100mV and 300mV. When selected to 100mV it will take less signal

from the audio source to achieve max output.

• DP SW #2 - VCA switch assigns what is Inputs are going to remotely controlled when a 10k ohm potentiometer is connect across

the two VCA (Voltage Control Amplifier) ports. There are two selections a for remote level control, Input 6 (music) or the overall amp

Master Level.

• DP SW #3 - Low Cut switch when assigned to On (UP) activates a Low Cut Filter reducing signal from 300Hz 6dB per octave and

below. Note: The Bass control on the front panel is active. This is ideal to use with paging horns.

• DP SW #4 - Input 6 Mute Receive, When the DPA SW is placed in the On (UP) position the input can be muted via the Remote