CleanDigital MA2B Manuel utilisateur

MA2B

Mini Digital Amplifier

Version: MA2B_2016V1.0

User Manual

Mini Digital Amplifier

Preface

Read this user manual carefully before using this product. Pictures shown in this manual is for reference only, different model and

specifications are subject to real product.

This manual is only for operation instruction only, not for any maintenance usage. The functions described in this version are

updated till March 2016. Any changes of functions and parameters since then will be informed separately. Please refer to the dealers

for the latest details.

All product function is valid till 2016-3-1.

Trademarks

Product model and its logo are trademarks. Any other trademarks mentioned in this manual are acknowledged as the properties of

the trademark owner. No part of this publication may be copied or reproduced without our prior written consent.

FCC Statement

This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the

instructions, may cause harmful interference to radio communications. It has been tested and found to comply with the limits for a

Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against

harmful interference in a commercial installation.

Operation of this equipment in a residential area is likely to cause interference, in which case the user at their expense will be

required to take whatever measures may be necessary to correct the interference

Any changes or modifications not expressly approved by the manufacture would void the user’s authority to operate the equipment.

Mini Digital Amplifier

SAFETY PRECAUTIONS

To insure the best from the product, please read all instructions carefully before using the device. Save this manual for further

reference.

lUnpack the equipment carefully and save the original box and packing material for possible future shipment

lFollow basic safety precautions to reduce the risk of fire, electrical shock and injury to persons.

lDo not dismantle the housing or modify the module. It may result in electrical shock or burn.

lUsing supplies or parts not meeting the products’ specifications may cause damage, deterioration or malfunction.

lRefer all servicing to qualified service personnel.

lTo prevent fire or shock hazard, do not expose the unit to rain, moisture or install this product near water.

lDo not put any heavy items on the extension cable in case of extrusion.

lDo not remove the housing of the device as opening or removing housing may expose you to dangerous voltage or other

hazards.

lInstall the device in a place with fine ventilation to avoid damage caused by overheat.

lKeep the module away from liquids.

lSpillage into the housing may result in fire, electrical shock, or equipment damage. If an object or liquid falls or spills on to the

housing, unplug the module immediately.

lDo not twist or pull by force ends of the optical cable. It can cause malfunction.

lDo not use liquid or aerosol cleaners to clean this unit. Always unplug the power to the device before cleaning.

lUnplug the power cord when left unused for a long period of time.

lInformation on disposal for scrapped devices: do not burn or mix with general household waste, please treat them as normal

electrical wastes.

Mini Digital Amplifier

Table of Contents

1.!Introduction ............................................................................................ 1!

1.1.!Introduction to MA2B ..................................................................... 1!

1.2.!Features......................................................................................... 1!

1.3.!Package List .................................................................................. 1!

2.!System Connection Introduction ............................................................ 1!

2.1.!Audio Output.................................................................................. 1!

2.1.1.!Default output: 2x20Watt@4Ohm ...................................... 1!

2.1.2.!Bridge connection: 1x40Watt@8Ohm ................................ 1!

2.1.3.!Dual-mono Output .............................................................. 2!

2.2.!Microphone input ........................................................................... 2!

2.2.1.!48V phantom power input .................................................. 2!

2.2.2.!MIC input ............................................................................ 2!

2.2.3.!LINE input........................................................................... 2!

3.!Operation of the Control Panel and the IR Remote ............................... 2!

3.1.!Operation of the Control Panel ...................................................... 2!

3.1.1.!Audio switching .................................................................. 3!

3.1.2.!Volume/EQ controlling........................................................ 3!

3.2.!Usage of the IR Remote ................................................................ 3!

4.!System Diagram..................................................................................... 4!

5.!Communication Protocol and Command Codes .................................... 5!

6.!Specification........................................................................................... 5!

7.!Panel Drawing........................................................................................ 6!

8.!Troubleshooting & Maintenance ............................................................ 7!

9.!After-sales Service ................................................................................. 8!

Mini Digital Amplifier

1. Introduction

1.1. Introduction to MA2B

MA2B is a compact-size digital amplifier (Class-D) with 3 inputs (2 line in and 1 balanced MIC). It is integrated with powerful

functions, including bridge connection, dual-mono, EQ control, microphone mixer etc.

It has a good application in different places, including classroom, small meeting room, lecture hall, bar, pub etc.

1.2. Features

l2x20Watt@4Ohm as the default amplifier output.

lBridge connection function. User can switch MA2B to be 1x40Watt@8Ohm by bridge connection.

lTwo stereo audio inputs, switchable by button, IR remote & RS232.

lVolume/Bass/Treble controllable by buttons IR remote & RS232.

lMIC port can support balance/unbalance signal to help suppress the external noise.

lLine audio output at 3.5mm jack, with volume controllable.

lDual-mono function. User can sum up the stereo audio to two times mono audio.

lMIC mixer function. The microphone will be mixed to the line audio output, and be controlled separately.

lMIC input supports 48V phantom power, dynamic MIC and wireless MIC.

lAuto noise gate. It keeps detecting the audio and MIC input, will mute the output when there is no input.

lUltra low inrush current, no need for power sequencing. This allows multiple MA2B to be powered on simultaneously without

overloading power circuits.

lConvection cooler, fan is not needed.

lAntistatic case design: providing good protection for long-term and stable performance.

1.3. Package List

Ø1 x MA2B (The mounting ears and MA2B are as a whole.)

Ø2 x Pluggable Terminal Blocks

Ø1 x RS232 Cable

Ø1 x Power Adapter

Ø1 x Power Cord

Ø4 x Plastic Cushions

Ø1 x User Manual

Notes：

ØThe IR remote and its battery are offered for charge separately.

ØThe IR receiver is also offered for charge.

ØPlease confirm if the product and the accessories are all included, if not, please contact with the dealers.

2. System Connection Introduction

2.1. Audio Output

2.1.1. Default output: 2x20Watt@4Ohm

The default output of amplifier is 2x20Watt@4Ohm, so user can connect the amplifier output in the regular way. As the picture below:

2.1.2. Bridge connection: 1x40Watt@8Ohm

The MA2B has the bridge connection, to double the output power at 1x40Watt@8Ohm. It will sum up the input left channel and input

right channel to be mono output, and the power is up to 40Watt.

The bridge connection is:

Connecting the four pins, like this

Mini Digital Amplifier

2.1.3. Dual-mono Output

The MA2B also has the function of double-mono output. It can sum up the left and right channel, to be the mono audio output. In this

way, the both of the outputs are showing the same mono audio.

The connection is:

2.2. Microphone input

The microphone input of MA2B has three modes, and different modes use different connections, as the picture below:

2.2.1. 48V phantom power input

When the switch turns to “48V”, the MIC input will provide a 48V phantom power. This is usually used for power supply for condenser

microphone, Connection is:

“+” connects to positive, “-” connects to negative and “╧” to ground.

Note: In this mode, only condenser microphone can be connected with.

2.2.2. MIC input

When the switch turns to “MIC”, the microphone input is used for connecting with dynamic microphone. There are two different

connections:

1) Unbalanced connection:

“╧” connects to ground, and “-” connects to signal.

“╧” connects to ground, and “+” connects to signal.

2) Balanced connection: “+” connects to positive, “-” connects to negative and “╧” connects to ground.

2.2.3. LINE input

When the switch turns to “LINE”, the microphone input is used for connecting with normal audio or wireless microphone output.

There are two different connections:

1) Unbalanced connection:

“╧” connects to ground, and “-” connects to signal.

“╧” connects to ground, and “+” connects to signal.

2) Balanced connection: “+” connects to positive, “-” connects to negative and “╧” connects to ground.

3. Operation of the Control Panel and the IR Remote

3.1. Operation of the Control Panel

The buttons provides the control of volume/EQ control and switching. The following content introduces audio switching and EQ

control in detail.

Connecting the two pins, like this

Connecting the four pins, like this

Mini Digital Amplifier

3.1.1. Audio switching

There are two switchable stereo audio inputs, one 2xRCA input, and one 3.5mm jack input, switchable through the buttons as below:

3.1.2. Volume/EQ controlling

The line volume and MIC volume can be controlled by the buttons.

The MIC Volume/LINE volume/LINE bass/LINE treble will be selected by the buttons, and controlled up/down/mute by the function

buttons. Please check the picture below:

For example, to turn up the line volume, you should select the “LINE” first, and then press the button “ ”.

3.2. Usage of the IR Remote

Mute Mode:

MIC: Mute the

microphone volume.

LINE: Mute the line

volume.

SPEAKER: Unmute

Use to transmit the

infrared signal send by

the IR remote.

Audio Controlling Modes

MIC: turn up/down the

microphone volume.

LINE: turn up/down the line

volume.

BASS: bass tuning

TREBLE: treble of line volume.

Audio Inputs

1: RCA dual-mono audio inputs

2: 3.5mm jack

Source

Selection

Select the

function

from this

menu.

Then to turn

down/up the

level, or

mute the

output.

Mini Digital Amplifier

Notice: The IR remote, the IR receiver, and the battery of the IR remote are all offered for charge.

4. System Diagram

IR receiver head, works in

conjunction with the IR

remote. Please point the IR

remote at the IR receiver

when use, to avoid getting out

of control as there is no signal

detected.

3.5mm jack, insert

it into the

specialized socket

(3.5mm) to connect

the IR receiver with

the amplifier

Mini Digital Amplifier

5. Communication Protocol and Command Codes

Communication Protocol: RS232 Communication Protocol

Baud rate: 9600 Data bit: 8 Stop bit: 1 Parity bit: none

Command

Function Description

Feedback Code

1A1.

Switching the audio to input 1

A: 1 -> 1

2A1.

Switching the audio to input 2

A: 2 -> 1

0A0.

Mute Audio of MIC and Line out

Mute

1A0.

Mute audio of MIC

Mute MIC

2A0.

Mute audio of line out

Mute LIN

0A1.

Unmute Audio

Unmute

3A0.

Switch on Noise Gate

Gate On

4A0.

Switch off Noise Gate

Gate Off

600%

Checking the working status

A: 1 -> 1

Volume: 30

Bass: 00

Treble: 00

601%

MIC volume up

Volume of MIC: 51

602%

MIC volume down

Volume of MIC: 51

603%

Line volume up

Volume of LINE: 51

604%

Line volume down

Volume of LINE: 51

605%

Bass level up

Bass of LINE: 04

606%

Bass level down

Bass of LINE: 04

607%

Treble level up

Treble of LINE: 04

608%

Treble level down

Treble of LINE: 04

609%

Initialization, back to the default

setting

Init OK

5[x][x]%

Preset MIC volume, [xx] arranges

from [00] to [60].

61 degrees in total.

Volume of MIC: 50

7[x][x]%

Preset line volume, [xx] arranges

from [00] to [60].

61 degrees in total.

Volume of LINE: 50

8[x][x]%

Preset the bass level, [xx] arranges

from [00] to [08].

9 degrees in total.

Bass of LINE: 04

9[x][x]%

Preset the treble level, [xx] arranges

from [00] to [08].

9 degrees in total.

Treble of LINE: 04

Notice:

1: The letter inside bracket [ ] is the variable code, which is changeable.

2: The bracket [ ] is not included to the RS232 commands.

3: Any dot “.” after the letters is part of the commands.

Example 1:

Switching the input 2 to the line out, RS232 command is: [2A1.]

Example 2:

Turning up the volume of line audio, RS232 command is: [603%]

Example 3:

Preset the MIC volume to “21” degree, RS232 command is: [521%]

Example 4:

Checking the working status of MA2B, RS232 command is: [600%]

6. Specification

Audio Input

Audio Output

Input

2 stereo audio,

1 MIC

Output

1 amplifier,

1 stereo audio

Input

Connector

2 RCA

1 3.5mm jack

1 pluggable terminal

block (3P, 3.81mm),

Output

Connector

1 3.5mm jack

1 pluggable terminal

block (4P, 5.08mm)

Mini Digital Amplifier

Input

Impedance

>10KΩ

Output

Impedance

50Ω/stereo,

4~8Ω/Amplifier

Audio General

Frequency

Response

20Hz ~ 20KHz

CMRR

>70dB@20Hz~20KH

SNR

80dB at maximum

output

Bandwidth

20Hz ~ 25KHz

Stereo

Channel

Separation

>75dB@20Hz to

20KHz

THD + Noise

1%@1KHz,

0.3%@20KHz

at nominal level

Voltage Gain

32dB

Power Output

2x20 Watts (4 Ohms)

Control Function

RS232 Control

3-hole phoenix

connector

Panel Control

Optional button

control

IR Remote

Optional IR remote

7. Panel Drawing

123 mm

57 mm

87 mm

99 mm

13 mm

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