Inter-M MA-106 User Manual

Operation Manual

Public Address Amplifier

MA-106

PUBLIC ADDRESS AMPLIFIER

Welcome

Welcome

A personal welcome to you from the management and employees of Inter-M

All of the co-workers here at Inter-M are dedicated to providing excellent products with inherently good value,
and we are delighted you have purchased one of our products.

We sincerely trust this product will provide years of satisfactory service, but if anything is not to your complete
satisfaction, we will endeavor to make things right.

Welcome to Inter-M, and thank you for becoming part of our worldwide extended family!

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK.

DO NOT REMOVE COVER (OR BACK).

NO USER-SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

WARNING

To prevent fire or shock hazard, do not
expose the unit to rain or moisture.

*WARNING FOR YOUR PROTECTION PLEASE READ THE FOLLOWING-WATER AND MOISTURE: Unit should not be used near water(e.g.

near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc). Care should be taken so than objects do

not fall and liquids are not spilled into the enclosure through openings.
*Do not install this equipment in a confined space such as a book case or similar unit.
*This apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such vases, shall be placed on the apparatus.
*This apparatus shall be connected to a mains socket outlet with a protective earthing connection.
*

It has heed to be easy to disconnect the device. To disconnect the device from power, separate AC input cable from inlet or unplug the AC Cord.

CAUTION

*These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock, do not perform any servicing

other than that contained in the operating instructions unless you are qualified to do so.

NOTE
*This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are

designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will
be required to correct the interference at his own expense.

This symbol 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.

This symbol is intended to alert the user to the
presence of important operation and maintenance
(servicing) instructions in the literature accompanying
the appliance.

Caution: To prevent electric shock do not use this (polarized) plug with

an extension cord, receptacle or other outlet unless the blades
can be fully inserted to prevent blade exposure.

Attentions: Pour prévenir les chocs électriques ne pas utiliser cette

fiche polarisée avec un prolongateur, une prise de courant
on une autre sortie de courant, sauf si les lames peuvent
étre insérées à fond sans en laisser aucune partie à
découvert.

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Contents

Contents

Unpacking .......................................................................................................................................2

Installation

Environment....................................................................................................................................2

Important Safety Instructions.............................................................................................................2

Features............................................................................................................................................3

Operation ........................................................................................................................................3

Front Panel ......................................................................................................................................4

Rear Panel .......................................................................................................................................5

Connecting Speakers.....................................................................................................................7

Applications ....................................................................................................................................8

Block Diagram ................................................................................................................................9

Specifications ................................................................................................................................10

Service

Procedures....................................................................................................................................12

Schematic.....................................................................................................................................12

Parts List .......................................................................................................................................12

Variations and Options ...............................................................................................................12

Warranty .......................................................................................................................................12

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Installation

Unpacking

Unpacking

Although your MA-106 is neither complicated nor difficult to operate, we recommend you take a few minutes to
read this brief manual and familiarize yourself with the important information regarding product features, setup
and operation.

As with most electronic devices, we strongly recommend you retain the original packaging. In the unlikely event
the product must be returned for servicing, the original packaging (or reasonable equivalent) is required.

Installation

Environment

Never place this product in an environment which could alter its performance or reduce its service life. Such
environments usually include high levels of heat, dust, moisture, and vibration.

IMPORTANT SAFETY INSTRUCTIONS

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.

10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and
the point where they exit from the apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus.
When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

13. Unplug this apparatus during lightning storms or when unused for long periods of time.

14. Refer all servicing to qualified service personnel. Servicing is required when the
apparatus has been damaged in any way, such as power-supply cord or plug is
damaged, liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has
been dropped.

S3125A

S3125A

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Features

Features

Features

- COMPACT DESIGN

Easy to install and operate with compact design of 1U size and functions.

- DIGITAL AMPLIFIER CIRCUIT

Take up the Digital Amplifier Circuit with High efficiency of the rated power 60W, High reliability, Low weight
and Low temperature.

- SUPPLY POWER BY SMPS

Take up SMPS (Switching Mode Power Supply) for Low electric power and Low weight.

- VARIOUS INPUT CONTROL FUNCTION

Control the each input channel level using the sound control volume of INPUT 1~3.

- INPUT SIGNAL LEDS

Easy to check the inputted signal to INPUT 1~3.

- TONE CONTROL FUNCTION

Separate Bass(100Hz) and Treble(10kHz) controls to tailor your sound.
Easy to control the tone due to user frequency which is including bass and treble.

- ADDITIONAL FUNCTIONS

Easy to use with the various additional functions including power of phantom MIC, TEL IN.

- PRIORITY MUTING

Adopted the priority muting function which control the other input signal, by TEL IN and INPUT 1 signal and
external MUTE.

Operation

Operation

1. Before you plug the power cord to AC outlet, please set the power switch OFF, Tone Control center, and

volume level minimum.

2. Please make sure the speakers and input jacks are properly connected before turn the power switch on.

3. Be sure the AC power is correct voltage before you plug into the power cord.

4. Please push the power switch, then the power input LED is on and the unit will be operated.

5. Please use your own with adjustment the volume using each input volume and master volume, the tone using

the tone control.

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Front Panel

Front Panel

1. MIC INPUT JACK FOR INPUT 1 (6.3ø Phone Jack, Balanced)

This input allow you to connect balanced 6.3ø Phone Jack plugs.
If this input is connected, Turn the inputting signal to INPUT 1 on the rear panel off.

2. INPUT SIGNAL LED

The SIGNAL LED is lighting by input signal of INPUT 1~3.

3. INPUT VOLUME

These knobs control the volume level of INPUT 1~3.

4. TONE CONTROL

These knobs provide continuous control of the high (10kHz) and low (100Hz) frequency response, by
adding up to 12dB of cut (decrease) or boost (increase).

5. MASTER VOLUME LEVEL

This knob provides continuous control of the controlled overall signal level by each volume.

6. POWER LED

Display the power ON/OFF.

7. POWER SWITCH (PUSH TYPE)

Pressing the power switch turns the unit on. Pressing it again turns off.
* This switch makes up that one pole be cut off when power is off.

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Rear Panel

Rear Panel

1. AC POWER CORD

Connect this cable to an AC outlet.

2. SPEAKER OUTPUT TERMINAL

These terminals are used to connect speakers to the unit. You may select 4Ω conventional operation, or high
impedance operation at either 70V/82Ω or 100V/167Ω.
(USA/CANADA & Associated : 25V/10.5Ω or 70V/82Ω)
Can’t use these terminals at the same time.
NOTE: The unit is disable to operate in case of the total impedance is less than the rated impedance

indicated. (If you’re running speakers, you have to make sure total impedance does not go below
the rated impedance.)

3. EXTERNAL MUTE CONTROL TERMINAL

Be able to use this terminal when you want to cut off the unit’s output signal from the external equipment.

4. TEL IN TERMINAL

This is the audio signal input terminal of switchboard.
If the signal is inputted to the terminal, you are able to control the output of other input signals by the priority
control volume of TEL IN.

5. TEL IN PRIORITY CONTROL VOLUME

This is able to control the mute level of INPUT 1~3 when the signal is inputted from the TEL IN terminal.

6. INPUT 3 TERMINAL

This is an unbalanced input terminal and connected with the external units.(CD, DVD, computer, etc.)
If you connect with computer, ‘Y’ jacks are required.

- 6.3ø Phone Jack : Unbalanced

- RCA Jack : Unbalanced

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7. INPUT 2 TERMINAL

This is a balanced input terminal and connected with the mic signal or the external units.

8. INPUT 2 LEVEL SELECT SWITCH

This switch selects the input signal of INPUT 2.

9. INPUT 1 TERMINAL OF REAR PANEL

This is a balanced XLR input terminal that the signal is inputted.
If the front panel’s MIC input terminal is connected with 6.3ø Phone Jack, the rear panel’s MIC input terminal
don’t output the signal.

10. SELECT SWITCH OF INPUT 1 PHANTOM MIC

This switch selects a kind of INPUT 1’s MIC on the rear panel.
Be able to use either DYNAMIC MIC or CONDENSER MIC, and the phantom power of +15V is supplied
when using the condenser mic.
MIC : Select in case of using a general dynamic mic
PHANTOM MIC : Select in case of using a condenser mic

11. THE PRIORITY CONTROL VOLUME OF INPUT 1

The output of INPUT 2,3 is controlled by the priority control volume of INPUT 1 when the signal is inputted to
the INPUT 1 terminal.

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Connecting Speakers

Connecting Speakers

Before connecting speakers to MA-106 unit, be sure to disconnect the AC power cable.

NOTE : 1. Make certain that the total impedance is not less than the rated impedance indicated.

2. Don’t have to use several speaker terminals at the same time.

3. If you’re just dealing with the high impedance terminal, then make sure that 4Ω output terminal is
connected with OPT-IN terminal.

- FOR 70V TERMINAL - FOR 100V TERMINAL

(ONE 4Ω SPEAKER) (TWO 8Ω SPEAKERS)

- FOR 4Ω TERMINAL

*3*3

4Ω

SPEAKER

8Ω

8Ω

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Applications

Applications

You have to select one between 4Ω and High voltage output.
You never use both 4Ω with High voltage output at the same time.
If you do this system will have damaged or work protection.

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Block Diagram

Block Diagram

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Specifications

Specifications

MA-106

Rated Output Power 60W
Speaker Output Power / Impedance 15.5V/4Ω, 25V/10.5Ω, 70V/82Ω, 100V/167Ω
Input Sensitivity / INPUT 1 -50dBV / 2kΩ

Impedance INPUT 2(MIC) -50dBV / 2kΩ

INPUT 2(LINE) -10dBV / 20kΩ
INPUT 3 -10dBV / 10kΩ

TEL IN 0.775 / 600Ω
Frequency Response (±3dB) 80Hz ~ 15kHz
T.H.D (at 1kHz Rated Output) Less than 1% at 60W(with AES-17 filter)
S/N INPUT 1,2 Better than 60dB

INPUT 3, TEL IN Better than 70dB
Tone Control BASS (100Hz) ±12dB

TREBLE (10kHz) ±12dB
Operating Temperature -10°C ~ +40°C
Power Source 100–120VAC or 220–240VAC, 50/60Hz

(Supplied AC mains depends on country requirements)
Power Consumption 24W
Weight 3.0kg/6.6lb
Dimensions 300(W) x 44(H) x 230(D)mm/11.8(H) x 1.7(H) x 9.1(D)in

* Specifications and design subject to change without notice.

Remark: 1. All specifications are measured with AES-17 filter.

2. This sytem is used digital Amplifier (PWM Modulation) so the PWM leakage signal will appear to
output terminal, but it doesn’t matter. You can’t hear the PWM leakage sound because of PWM
frequencies is very higher than Audio frequencies.

* 0dBV = 1.0Vrms

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DIMENSIONS

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Service

Service

Procedures

Take steps to insure the problem is not related to operator error or other products within the system. Information
provided in the troubleshooting portion of this manual may help with this process. Once it is certain that the
problem is related to the product contact your warranty provider as described in the warranty section of this
manual.

Schematic

A Schematic is available by contacting your warranty provider.

Parts List

A Parts List is available by contacting your warranty provider.

Warranty

Warranty

Warranty terms and conditions vary by country and may not be the same for all products. Terms and conditions
of warranty for a given product may be determined first by locating the appropriate country which the product
was purchased in, then by locating the product type.

To obtain specific warranty information and available service locations contact Inter-M directly or the
authorized Inter-M Distributor for your specific country or region.

Variations and Options

Variations and Options

Variations

Variations of this product exist to reflect the variations in AC power requirements throughout the world. Product
supplied through local sources are compatible with local AC power requirements.

Options

No optional items are available for this product.

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MADE IN KOREA

November 2009 125233

Inter-M, Ltd. (Korea) began operations in 1983.

Since then, Inter-M has grown to become one of the largest manufacturers
of professional audio and commercial sound electronics equipment in the world.

Inter-M has gained worldwide recognition for its own branded products,
as well as private label manufacturing of electronics sold under other names (OEM).

The company is no longer just a Korean company, but rather a global company
that is truly international in scope, with factories and offices in Korea and China,
and sales and marketing operations located in Japan, Europe, and the U.S.A.

With more than 850 employees around the globe,
Inter-M is well-poised for further growth and expansion.

Inter-M Americas, Inc.

13875 Artesia Blvd. Cerritos, CA 90703 USA
TEL : [phone], FAX : [phone]
Home Page : http://www.inter-m.net, E-mail : [e-mail]

Inter-M Corporation

Seoul OFFICE:653-5 BANGHAK-DONG, DOBONG-KU, SEOUL, KOREA
TEL : [phone]~8, FAX : [phone]
Home Page : http://www.inter-m.com, E-mail : [e-mail]