Inter-m MA-212 Operation Manual

Operation Manual

Public Address Amplifier

MA-206/212

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!

PUBLIC ADDRESS AMPLIFIER

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.

*CLASS 2 WIRING (Adjacent to speaker terminal): The speaker output of this apparatus can exceed 10 Watts and could be a shock injury.

Connection to speakers should be performed by a skilled person.
*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

Accessories.....................................................................................................................................3

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

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

Rear Panel.......................................................................................................................................6

Connecting Speakers.....................................................................................................................8

Applications ....................................................................................................................................9

Block Diagram..............................................................................................................................10

Specifications................................................................................................................................11

Service

Procedures....................................................................................................................................13

Schematic.....................................................................................................................................13

Parts List .......................................................................................................................................13

Variations and Options...............................................................................................................13

Warranty .......................................................................................................................................13

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Installation

Unpacking

Unpacking

Although your MA-206/212 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

- A PUBLIC ADDRESS AMPLIFIER WITH RATED OUTPUT OF 60W/120W

Take up the Digital Amplifier Circuit with High efficiency of the rated power 60W/120W, 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 1~6.

- INPUT SIGNAL LEDS

Easy to check the inputted signal to INPUT 1~6.

- 5 BAND GRAPHIC EQUALIZER

This system is provided the 5 bands equalizer.
You can control the tone each frequency by using them.

- SPEAKER SELECTOR

6 speaker selector switches are provided to enable you to select 5 speakers individually or totally.

- ANNOUNCEMENT CHIME AND SIREN

- VCA(VOLTAGE CONTROLLED AMPLIFIER)

- EXT MUTE, EXT CHIME AND TEL IN FUNCTION

- 10-DOT LED LEVEL METER

Operation

Operation

1. Do not connect the AC power until step 4.

The AC mains POWER switch should be in the OFF position.

2. Adjust the MASTER and all INPUT 1~6 volume controls of the MIN position (turn counterclockwise).

3. Adjust the graphic equalizer so that all slides are set to the 0dB position.

4. Connect the OUTPUTS to the speaker load according to the mode of operation determined in the previous step.

5. Depress the AC mains POWER switch to the ON position.

The POWER ON indicator will illuminate.

6. The product is ready for operation, Slowly increase the LEVEL control to the desired operating level.

Avoid illuminating the PEAK indicator and do not apply too much power to the speakers.

Accessories

One detachable AC power cord is provided for use with this product.

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Front Panel

Front Panel

1. INPUT 1~6 VOLUME

These knobs provide continuous control of the volume of INPUT 1~6.

2. INPUT SIGNAL LED

The SIGNAL LED is lighting by input signal of each channel.

3. MASTER VOLUME

This knob provides continuous control of the overall volume of amplifier's output signal.

4. PROTECTION INDICATOR

This LED indicates the state of the amplifier's protection circuitry and MUTE function.
When the protection LED is on (illuminated), the protection circuitry is active, indicating that the unit is not
operating normally.

5. GRAPHIC EQUALIZER

Each slider controls the cut (decreased gain) or boost (increased gain) for its associated frequency band.
The middle position indicates flat response (no cut or boost).
Moving the slider upwards increases that frequency's gain, while moving it down decreases the level of that
frequency.

6. 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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7. SPEAKER SELECTOR / LED

These switches are used to select output to any combination of up to five individual speakers.

8. OUTPUT LEVEL INDICATOR

This indicates the main output signal level relative to the rated power output which is marked as 0dB.

9. SIREN SWITCH / LED

Pressing this switch will activates the siren circuitry.
Pressing it a second will gradually lower the siren signal, turning it off completely after apprximately 2.5
seconds.

10. CHIME SWITCH / LED

Pressing this switch will activates the four-tone chime circuitry.

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Rear Panel

Rear Panel

1. AC POWER INLET

Connect this product to an appropriate AC power source using the supplied Universal AC Power Cord.

2. EXT CHIME TERMINAL

When these two terminals are shorted, the four-tone chime circuitry is activated.

3. EXT MUTE TERMINAL

When these two terminal are shorted, the output signal is blocked and the protection indicator on the front
panel is turned on.

4. VCA(VOLTAGE CONTROLLED AMPLIFIER) TERMINAL

The VCA allows remote adjustment of the post-master volume signals.
When performing the remote volume control, adjust the master volume control in advance noting that its
setting limits the maximum signal level adjustable with the volume control. Be sure to avoid turning fully down
the master volume control.

REMOTE VOLUME
10K

Ω

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5. TEL IN TERMINAL

These terminals are provided for connection with a telephone exchange system for paging purposes.
※ NOTE : When the telephone input is active, all other input signal except AMP IN is able to muted.

6. TEL IN MUTE VOLUME

This is able to control the mute level of all other input signal except AMP IN when the signal is inputted from
the TEL IN terminal.

7. INPUT 1~6 JACK AND INPUT SELECTION SWITCH

INPUT 1~6 are utilized to connect various external sound source devices including MIC, CD, TUNER, etc

1) INPUT 1~3 (Balanced XLR JACK) AND INPUT SELECTION SWITCH
LINE: It can be used as LINE level signal input.
MIC: It can be used as the normal dynamic MIC input.
PHANTOM: It can be used as the condenser MIC input and DC 24V is supplied to the input terminal.

2) INPUT 4~5 (Balanced 6.3Ø Phone JACK) AND INPUT SELECTION SWITCH
LINE: It can be used as LINE level signal input.
MIC: It can be used as the normal dynamic MIC input.

3) INPUT 6 (RCA JACK)
It can be used as an extra stereo input for a stereo source such as a tape deck or CD player.
NOTE: When both inputs are used, the signal is summed and combined.

8. PRIORITY CONTROL VOLUME

The output of INPUT 3~6 are controlled by the priority control volume when the signal is inputted to the INPUT
1~2, LINE IN, CHIME and SIREN.

9. LINE IN

This line-level input connects the unit with an external mixer for expanded input channels.

10. LINE OUT

This line-level output connects the unit with an external mixdown deck or other recording source.

11. AMP IN

This input connects an external mixer or preamp with the unit’s power amp. Inserting a plug into the Amp In jack
will disconnect all input signal from the unit’s internal mixer. Only signal from the external source will be heard.

12. SPEAKER OUTPUT TERMINALS

This terminal is for speaker wire connection.
Connect speakers whose combined impedance is equal to or higher than the rated output impedance, as
shown below.

4Ω (LOW IMPEDANCE) SPK 1~5 (HIGH IMPEDANCE)

15.5V / 4Ω (60W)

EC & Associated : 100V / 167Ω

USA / CANADA & Associated : 70V / 82Ω

22V / 4Ω (120W)

EC & Associated : 100V / 83Ω

USA / CANADA & Associated : 70V / 41Ω

MA-206

MA-212

Model

OUTPUT

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Connecting Speakers

Connecting Speakers

Before connecting speakers to your MA-206/212 unit, be sure to disconnect the AC power cable.
Make certain that the total impedance is not less than the rated impedance indicated.

For 4Ω low impedance speakers, connect in parallel, with the positive (+) connectors to the 4Ω terminal
and the negative (-) connectors to the COM terminal.

For high impedance systems, connect with matching transformer as the following Figure. Be certain that
the total impedance does not equal less than the rated impedance.

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Applications

Applications

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Block Diagram

Block Diagram

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MA-206 MA-212

Rated Output (RMS) 60W 120W

Frequency Response 80Hz-15kHz

Total Harmonic Distortion (T.H.D) Less than 1%

Signal to Noise Ratio

(S/N @ LINE IN)

Better than 75dB

Graphic Equalizer

±12dB

(100Hz, 330Hz, 1KHz, 3.3KHz, 10KHz)

INPUT SENSITIVITY/IMPEDANCE

INPUT 1~5

MIC -50dBV / 2kΩ

LINE -10dBV / 2kΩ

INPUT 6 -10dBV / 20kΩ

TEL IN 0.775dBV / 10kΩ

LINE IN 0dBV / 10kΩ

AMP IN 0dBV / 10kΩ

LINE OUTPUT/IMPEDANCE 0dBV / 600Ω

15.5V / 4Ω 22V / 4Ω

SPEAKER OUT / IMPEDANCE 70V / 82Ω 70V / 41Ω

100V / 167Ω 100V / 83Ω

Operating Temperature -10˚C ~+40˚C

Power Source 100–120VAC or 220–240VAC; 50/60Hz

(Supplied AC mains transformer depends on country requirements)

Power Consumption

38W 50W

Weight (SET) 5.4kg/11.9lb 6.7kg/14.8lb

Dimensions (SET) 420(W)×88(H)×328(D)mm/16.5(W)x3.5(H)x12.9(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.

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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.

Variations and Options

Variations and Options

Variations

Products supplied through legitimate sources are compatible with local AC power requirements.

Options

No optional items are available for this product.

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.

MADE IN KOREA

March 2010 125779

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]