AMC iAC Installation Power Amplifier

Safety Instructions

When using this electronic device, basic precautions should always be taken, including the following:

1. Read all instructions before using the product.
2. Do not use this product near water (e.g., near a bathtub, washbowl, kitchen sink, in a wet basement or near a swimming pool etc). Care should be taken that objects do not fall into liquids and liquids would not be spilled on the device.
3. Use this device when you are sure that it has a stable base and it is fixed securely.
4. This product, in combination with loudspeakers may be capable of producing sound levels that could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or at a level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult with an otorhinolaryngologist.
5. The product should be located away from heat sources such as radiators, heat vents, or other devices that produce heat.
6. Note for power connections: for pluggable equipment, the socket-outlet shall be installed near the equipment and shall be easily accessible.
7. The power supply should be undamaged and never share an outlet or extension cord with other devices. Never leave device plugged into the outlet when it is not being used for a long period of time.
8. Power disconnection: when the power cord connected to the power grid is connected to the machine, the standby power is turned ON. When the power switch is turned ON, the main power is turned ON. The only operation to disconnect the power supply from the grid, unplug the power cord.
9. Protective Grounding - An apparatus with class I construction shall be connected to a power outlet socket with a protective grounding connection. Protective Earthing - An apparatus with class I construction shall be connected to a mains socket outlet with a protective earthing connection.
10. The lightning flash with an arrowhead symbol, with an equilateral triangle, is intended to alert the user to the presence of uninsulated dangerous voltage within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. [warning symbol]
11. The exclamation mark within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. [alert symbol]
12. There are some areas with high voltage inside; to reduce the risk of electric shock, do not remove the cover of the device or power supply. The cover should be removed by qualified personnel only.
13. The product should be serviced by qualified service personnel if: The power supply or the plug has been damaged. Objects have fallen into or liquid has been spilled on the product. The product has been exposed to rain. The product has been dropped or the enclosure damaged.

Before You Start

Introduction

iAC amplifiers with an integrated signal processor are designed for 100 V and low impedance background music systems. The model line consists of single-channel and two-channel amplifiers. They all have an RS 232 control port for integration with third-party automation systems. They feature Balanced Phoenix and stereo RCA input with audio link connection for easy installation, and multiple voltage output suitable for 4 Ω, 70 V, and 100 V speaker lines.

Features

• Integrated signal processors
• RS232 control port
• Designed for 100V and low impedance music systems
• Ability to control treble, middle, and bass tones
• Stereo RCA AUX input
• Muting function
• Locking function
• Stand-by mode
• Supports 4 Ω, 70 V and 100 V speaker installations

Operation

Front Panel | iAC 120

Description: The front panel of the iAC 120 features:

• 1. Power button: Switches the amplifier power ON or OFF.
• 2. LCD display: Shows main information such as volume level, tone controls, muting, locking, and stand-by status.
• 3. Rotary encoder: Used to adjust amplifier parameters, navigate menus, and select channels.
• 4. Signal, Limiter & Mute Indicators: LEDs indicating audio signal presence (SIGNAL), limiter activity (LIMITER), and muted channels (MUTE).

Rear Panel | iAC 120

Description: The rear panel of the iAC 120 includes:

• 1. Stereo RCA & Balanced Phoenix Inputs: For line-level audio input.
• 2. Link output: For linking to other amplifiers.
• 3. RS232 serial interface: For control via serial communication.
• 4. Reset button: Resets amplifier parameters to default values.
• 5. Main output: Connects to speakers (COM, 40, 70V, 100V options).
• 6. Main power connector: For connecting the mains power cord.

Front Panel | iAC 240, iAC 360

Description: The front panel of the iAC 240 and iAC 360 is similar to the iAC 120, featuring:

• 1. Power button
• 2. LCD display
• 3. Rotary encoder
• 4. Signal, Limiter & Mute Indicators

Rear Panel | iAC 240, iAC 360

Description: The rear panel of the iAC 240 and iAC 360 is similar to the iAC 120, including:

• 1. Stereo RCA & Balanced Phoenix Inputs
• 2. Link output
• 3. RS232 serial interface
• 4. Reset button
• 5. Main output (with COM, 40, 70V, 100V options)
• 6. Main power connector

Front Panel | iAC 2X240

Description: The front panel of the iAC 2X240 features dual controls for two channels:

• 1. Signal, Limiter & Mute Indicators: Separate indicators for Channel 1 and Channel 2.
• 2. Power button
• 3. LCD display
• 4. Rotary encoder: Used for parameter adjustment and channel selection.

Rear Panel | iAC 2X240

Description: The rear panel of the iAC 2X240 includes:

• 1. Mode switch: Selects between 2 Channel Mode and Bridge Mode.
• 2. Stereo RCA & Balanced Phoenix Inputs: For Channel 1 and Channel 2.
• 3. Link outputs: For linking to other amplifiers.
• 4. RS232 serial interface: For control.
• 5. Reset button: Resets parameters.
• 6. Main output: Separate outputs for Channel 1 and Channel 2 (with COM, 40, 50V, 100V options).
• 7. Main power connector

Front Panel Functions

LED Indicators

• SIGNAL: Illuminates when an audio signal is present at the amplifier's input.
• LIMITER: Indicates when the audio signal limiter is active, reducing output power to prevent clipping.
• MUTE: Illuminated when the mute function is activated for a channel (red LED).

Power Button

Switches the amplifier power ON or OFF.

LCD Display

Displays main information about the amplifier, including volume level, tone controls, muting, locking, stand-by status, or sync settings.

Rotary Encoder

Used to adjust amplifier parameters. Rotate to change values and push to enter menus or sub-menus. Press and hold for one second to return to the default screen. A short push selects CH1 or CH2; holding it activates the selected channel menu. Pressing and holding for 5 seconds disables LOCK mode. Turning or pressing the knob can also wake the device from standby mode.

Rear Panel Functions

Mode Switch (iAC 2X240)

Allows the amplifier to operate in two modes: 2 controllable channels or a single channel mode. Both configurations can operate with 100 V lines.

• 2 CHANNEL MODE: Operates as two independent amplifiers.
• BRIDGE MODE: Combines both channels into a single, higher-power output.

Stereo RCA & Balanced Phoenix Inputs

Inputs for line-level audio signals.

Amplifier Outputs

Audio outputs suitable for 4 Ω, 70 V, and 100 V speaker lines. Only one output type can be used at a time. Using multiple outputs simultaneously may damage the amplifier or connected speakers.

RS232 Serial Interface

Enables control of the iAC amplifiers' main functions via a serial interface. RS232 protocol details are provided in the manual.

Reset Button

Resets all amplifier parameters to their default values. Activate by pressing and holding the button for two seconds.

Main Power Connector

Connects the amplifier to the mains power supply.

One Knob To Control Everything

The iAC series features a graphic LCD display and a single rotary/push encoder for easy control of all device parameters.

Menu System

In normal operating mode, the LCD shows the volume of each channel. Push the rotary encoder to switch between channels or return to the previous mode. Push and hold the rotary encoder to enter the main menu and access more parameter controls.

Volume

Adjusts the volume for each channel.

3 Band EQ

Allows adjustment of Bass, Middle, and Treble frequencies for each channel individually.

Muting

Each channel can be individually muted.

Sync Settings

Links both channels, allowing settings to be copied from one channel to another to control both amplifiers simultaneously.

Lock

Locks front panel controls to prevent unauthorized access to the amplifier's menu or volume settings. Press and hold the rotary encoder for 5 seconds to disable. This function affects front panel control only; serial control and reset functions remain accessible. Lock mode can also be enabled or disabled via RS232 command.

Active Stand By Mode

Mutes the amplifier and turns off the LCD display to save power. This mode is indicated by a red LED inside the power button. Turn or push the rotary encoder to disable standby mode. Standby mode can also be enabled or disabled via RS232 command.

RS232 Control Protocol

The following are common RS232 commands and their HEX sequences:

For iAC 120/240/360 Models:

• Vol +: 69 41 43 55 01 02 01 01 AA
• Vol -: 69 41 43 55 01 02 01 02 AA
• Mute: 69 41 43 55 01 02 01 A1 AA
• Unmute: 69 41 43 55 01 02 01 A0 AA
• Treble +: 69 41 43 55 01 06 01 01 AA
• Treble -: 69 41 43 55 01 06 01 02 AA
• Middle +: 69 41 43 55 01 11 01 01 AA
• Middle -: 69 41 43 55 01 11 01 02 AA
• Bass +: 69 41 43 55 01 05 01 01 AA
• Bass -: 69 41 43 55 01 05 01 02 AA
• Stand By Off: 69 41 43 55 0D 10 01 00 AA
• Stand By On: 69 41 43 55 0D 10 01 01 AA
• Lock On: 69 41 43 55 0D 11 01 01 AA
• Lock Off: 69 41 43 55 0D 11 01 00 AA
• Status: 69 41 43 55 0D FA 01 00 AA
• Firmware Version: 69 41 43 54 01 FF 01 00 AA

For iAC 2X240 Model:

• Vol + Ch1: 69 41 43 55 01 02 01 01 AA
• Vol - Ch1: 69 41 43 55 01 02 01 02 AA
• Mute Ch1: 69 41 43 55 01 02 01 A1 AA
• Unmute Ch1: 69 41 43 55 01 02 01 A0 AA
• Treble + Ch1: 69 41 43 55 01 06 01 01 AA
• Treble - Ch1: 69 41 43 55 01 06 01 02 AA
• Middle + Ch1: 69 41 43 55 01 11 01 01 AA
• Middle - Ch1: 69 41 43 55 01 11 01 02 AA
• Bass + Ch1: 69 41 43 55 01 05 01 01 AA
• Bass - Ch1: 69 41 43 55 01 05 01 02 AA
• Vol + Ch2: 69 41 43 55 02 02 01 01 AA
• Vol - Ch2: 69 41 43 55 02 02 01 02 AA
• Treble + Ch2: 69 41 43 55 02 06 01 01 AA
• Treble - Ch2: 69 41 43 55 02 06 01 02 AA
• Middle + Ch2: 69 41 43 55 02 11 01 01 AA
• Middle - Ch2: 69 41 43 55 02 11 01 02 AA
• Bass + Ch2: 69 41 43 55 02 05 01 01 AA
• Bass - Ch2: 69 41 43 55 02 05 01 02 AA
• Mute Ch2: 69 41 43 55 02 02 01 A1 AA
• Unmute Ch2: 69 41 43 55 02 02 01 A0 AA
• Sync/Copy Ch1 To Ch2: 69 41 43 55 01 01 01 01 AA
• Sync/Copy Ch2 To Ch1: 69 41 43 55 02 01 01 01 AA
• Unsync: 69 41 43 55 01 01 01 00 AA
• Vol + Ch1 and Ch2: 69 41 43 54 01 02 01 01 AA
• Vol - Ch1 and Ch2: 69 41 43 54 01 02 01 02 AA
• Treble + Ch1 and Ch2: 69 41 43 54 01 06 01 01 AA
• Treble - Ch1 and Ch2: 69 41 43 54 01 06 01 02 AA
• Middle + Ch1 and Ch2: 69 41 43 54 02 11 01 01 AA
• Middle - Ch1 and Ch2: 69 41 43 54 02 11 01 02 AA
• Bass - Ch1 and Ch2: 69 41 43 54 01 05 01 02 AA
• Bass + Ch1 and Ch2: 69 41 43 54 01 05 01 01 AA
• Mute All: 69 41 43 54 02 02 01 A1 AA
• Unmute All With Ch2 Vol: 69 41 43 54 02 02 01 A0 AA
• Unmute All With Ch1 Vol: 69 41 43 54 01 02 01 A0 AA

General Specifications

The specifications are correct at the time of printing this manual. For improvement purposes, all specifications for this unit, including design and appearance, are subject to change without prior notice.

Notes

AMC is a registered trademark of AMC Baltic [registered trademark].

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