Inter-M PA-2312 User Manual

PA-2312

ON

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2

312

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UBLIC ADDRESS 2 CH POWER AMPLIFIER

Public Address 2 CH Power Amplifier

* Rack mount products in the Western Hemisphere(North America, South America,

and the Caribbean) do not have handles installed due to customer preference.

Contents

Contents

Welcome

arning.........................................................................................................................................1

W

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

Installation

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

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

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

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

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

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

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

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

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

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

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

Service

Procedures....................................................................................................................................11

Schematic.....................................................................................................................................11

Parts List .......................................................................................................................................11

Variations and Options ...............................................................................................................11

Warranty .......................................................................................................................................11

UBLIC ADDRESS 2 CH POWER AMPLIFIER

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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!

his symb ol is inte nd ed to aler t the us er to t he

T

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

presence of uninsulated “dangerous voltage” within
the product’s enclosure that may be of suffi cient
magnitude to constitute a risk of electric shock to
persons.

AUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK.

C

DO NOT REMOVE COVER (OR BACK).

NO USER-SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

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

Attentions: Pour prévenir les chocs électriques ne pas utiliser cette

WARNING

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

*Do not install this equipment in a confined space such as a book case or similar unit.
*The apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such vases, shall be placed on the apparatus.
*Worded: “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.”

This sy mb ol is inte nd ed to a le rt the us er to t he
presence of important operation and maintenance
(servicing) instructions in the literature accompanying
the appliance.

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

fiche polarisée avec un prolongateur, une prise de courant
on une autre sortie de courant, sauf si les lames peuvent
étre in sé ré es à fond s an s en laisser au cu ne pa rt ie à
découvert.

PA-2312

1

UBLIC ADDRESS 2 CH POWER AMPLIFIER

S

3125A

P

Unpacking

Although your PA-2312 Power Amplifier 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

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

2

PA-2312

Features

Features

- HIGH POWER, LOW DISTORTION

20W of RMS power with less than 1% THD.

1

- ADVANCED PROTECTION CIRCUITRY

Thermal and current overload protection, power-on delay and automatic idling circuitry for component and
loudspeaker protection.

- BATTERY BACKUP

Can be powered by 24VDC battery for emergency backup and true portability.

- SLIM DESIGN, COMPACT SIZE

Streamlined design fits in a compact 3RU space.

Accessories

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

UBLIC ADDRESS 2 CH POWER AMPLIFIER

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Operation

Operation

Make certain that speakers and input sources are properly connected before switching on.

Keep volume levels at minimum gain before switching on.

NOTE: The system’s operation is delayed by approximately three seconds after pressing the AC Mains power

switch. This is due to the built-in protection circuitry, designed to protect speakers and other system
components.

PA-2312

3

UBLIC ADDRESS 2 CH POWER AMPLIFIER

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UBLIC ADDRESS 2 CH POWER AMPLIFIER

PA-2312

ON

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-40dB

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OFF

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Front Panel

Front Panel

1. PROTECTION INDICATOR

This LED indicates the state of the amplifier’s protection circuitry. When the Protection LED is on (illuminated),
the protection circuitry is active, indicating that the unit is not operating normally. This is typically due to
overheating or power limiting. Please check the Input and Output condition of the amplifier.
Note that the Protection Indicator lights for approximately six seconds when the amplifier is first powered on.

2. OUTPUT LEVEL INDICATORS

These LEDs indicate the amplifier’s output status, lighting when audio signal is received. The red CLIP LED
indicates an excessive output level. Do not operate the unit with the CLIP LED steadily on (illuminated).

3. POWER SWITCH

Pushing this switch up switches the unit on. Pushing it down switches the unit off.

4. POWER LED

When the unit is powered on, the Power LED will glow steadily.

5. INPUT ATTENUATORS

These are controls for regulating each channel’s output level. Clockwise rotation increases gain.

4

PA-2312

Rear PanelRear Panel

1

45 67 8

2 3

UBLIC ADDRESS 2 CH POWER AMPLIFIER

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1. AC INPUT POWER

Connect the supplied standard AC input cable here.

2. SPEAKER OUTPUT TERMINALS

These terminals are provided for connecting speakers to the unit. Make certain the combined impedance of
the speakers is equal to or higher than the rated output impedance of the amplifier.

The impedance and output voltage are as follows.

•USA/CANADA & Associated Version •EC & Associated, JAPAN Version

Impedance 4Ω 5.2Ω 41Ω

Output Voltage 22V 25V 70V

3. FAN VENTS

These vents provide hot air flow out of the unit. It is important to keep them free of obstructions, to prevent the
unit from overheating. It is also important to operate the unit in a dust-free environment.

4. AC FUSE HOLDER

This holder contains the AC overload protection fuse. If the fuse has blown out, replace it with a fuse of the
same type and rating.
If the fuse continues to blow, please refer servicing to qualified service personnel.

5. HIGH-PASS FILTER SWITCH

This switch activates the high-pass filter circuit, which reduces excessive low frequency content to protect
speakers and components.

Impedance 4Ω 41Ω 83Ω

Output Voltage 22V 70V 100V

PA-2312

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UBLIC ADDRESS 2 CH POWER AMPLIFIER

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6. AUDIO INPUTS

Balanced input connectors are provided on both male and female XLR jacks for convenience.

7. GROUND LIFT SWITCH

This switch provides for connection or disconnection of the amplifier’s ground to AC “earth” ground, to
prevent noise from ground loops. Under most circumstances, this switch should be set to FRAME position.

8. DC INPUT TERMINALS

These terminals are provided for the connection of backup battery. Connect a 24VDC battery source to these
terminals. Make certain the red terminal is connected to the battery’s positive (+) side, and the black terminal
to the battery’s negative (–) side.

6

PA-2312

Connecting Speakers

OUTPUT

CH 1

CH 2

COM

OUTPUT

CH 1

CH 2

Connecting Speakers

Before connecting speakers to your PA-2312 unit, be sure to disconnect the AC power cable. Make certain that

he total impedance is not less than the rated impedance indicated.

t

For 4Ω speakers, connect the positive (+) connector to the 22V(4Ω) terminal and the negative (–) connectors to
the COM terminal.

For high-voltage distributed systems, connect with matching transformer to the COM and either 70V or 100V
terminals. Be certain that the total impedance does not equal less than the rated impedance.

- USA/CANADA & Associated Version

UBLIC ADDRESS 2 CH POWER AMPLIFIER

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- EC & Associated, JAPAN Version

PA-2312

7

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SWED 3
(

2000W)

SWED 2
(

2000W)

SWED 1
(

2000W)

UNSWED

(

700W)

E

MERGENCY

AC FUSE

T

2AL/250V

UNSWITCHED
D

C OUT 24V,1A MAX

REMOTE
C-SW-H

GND

BATTERY
INPUT 24V

( )

( )

( )

SWITCHED

D

C OUT 24V

5A MAX

(

)

(

)

SWITCHED DC OUT 24V

(

RACK ONLY)

(AMP ONLY)

AC INPUT

230V 50Hz, 217VA

www.inter-m.com

DC FUSE

T

5AL/250V

S

N

D

CINPUT

2

4V

L

INE

21 21

F

USE

T

400mAL

/

2

50V

INSER

www.inter-m.com

TINSERT

RECOUTPUT PRIORITY INPUT

MIC

MIC MIC MIC MIC MIC MIC MIC

CH2

OUTPUT OUTPUT

MUTE

ON

OFF

S

N

AC INPUT

230V 50Hz

9.8W

~

L

INE LINE LINE LINE LINE LINE

CH5 CH 4 CH 3 CH 2 CH1CH8 CH7 CH6

CH1

CH 12 CH10CH 11 CH 9

OC03OC03

0

210

CH16 CH15 CH14 CH13 CH12 CH11 CH10 CH9 CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1

REMOTE

S

N

(

)

(

)

(

)

(

)

AMP IN 1

AMP IN 2

ALL

GROUP1

GROUP2

TIMER

DC INPUT

2

4V

O

C03OC03

0

210

A

C INPUT : 230V 50Hz, 139VA

FUSE : T1AL / 250V

BATTERY IN

( )

( )

MADE IN KOREA

BATTERY CHARGER

MODEL NO. PB-9207A

~

NO USER SERVICEABLE PARTS INSIDE.

RISQUE DE CHOC ELECTRIQUE NE

CTRIC SHOCK, DO NOT REMOVE COVER.

R

EFER SERVICING TO QUALIFIED SERVICE

C

AUTION;

AVIS;

TOREDUCE THE RISK OF FIRE

REPLACE ONLY WITH SAME TYPE FUSE.

CAUTION;

TOREDUCE THE RISK OF ELE-

PERSONNEL.

PAS OUVRIR.

UTILISER UN FUSIBLE DE RECHANGE DE
M

EME TYPE.

NO USER SERVICEABLE PARTS INSIDE.

RISQUE DE CHOC ELECTRIQUE NE

CTRIC SHOCK, DO NOT REMOVE COVER.

R

EFER SERVICING TO QUALIFIED SERVICE

C

AUTION;

AVIS;

TOREDUCE THE RISK OF FIRE

REPLACE ONLY WITH SAME TYPE FUSE.

CAUTION;

TOREDUCE THE RISK OF ELE-

PERSONNEL.

PAS OUVRIR.

UTILISER UN FUSIBLE DE RECHANGE DE
M

EME TYPE.

S

N

MIC

PS-9116

SPEAKER

PB-9207A

AC INPUT

BATTERY
(DC24V)

PD-9359E

PA-2312

TURN TABLE

(CD, TUNER.....)

PP-9214

ON

( )

( )

BATTERY
(DC24V)

( )

( )

Applications

Applications

UBLIC ADDRESS 2 CH POWER AMPLIFIER

8

PA-2312

Block Diagram

Block Diagram

UBLIC ADDRESS 2 CH POWER AMPLIFIER

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PA-2312

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UBLIC ADDRESS 2 CH POWER AMPLIFIER

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Specifications..............................................................0dB=0.775Vrms

Specifications

- ELECTRICAL

Rated Output (RMS, THD 1%, 1kHz).....................................................................................................120W

Input Sensitivity/Impedance.............................................................................................1V/10kΩ, Balanced

T.H.D........................................................................................................................................Less than 1%

S/N....................................................................................................................................Better than 95dB

High Pass Filter.......................................................................................................................-3dB at 400Hz

Channel Separation ..............................................................................................................Less than –70dB

Output Voltage/Impedance........................................................EC, JAPAN: 4Ω/22V, 41Ω/70V, 83Ω/100V

......................................................................................USA/CANADA: 4Ω/22V, 5.2Ω/25V, 41Ω/70V

- GENERAL

Power Source....................................................................100–120VAC or 220–240VAC; 50/60Hz, 24VDC

..............................................................(Supplied AC mains transformer depends on country requirements)

Power Consumption(1/8 Power) ..........................................................................................................290W

Weight..................................................................................................................................17.9kg/39.5lb

Dimensions..............................................................482(W) x 132(H) x 280(D)mm/19(W) x 5.2(H) x 11(D)in

* Specifications and design subject to change without notice.

10

PA-2312

UBLIC ADDRESS 2 CH POWER AMPLIFIER

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Service

Service

Procedures

Ensure the problem is not related to operator error, or system devices that are external to this unit. 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(in Korea or the
USA) or the authorized Inter-M Distributor for your specific country or region.

PA-2312

11

N

OTE

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]

December 2005 9007907712 B

MADE IN KOREA