Inter-M DPA-1200S User Manual

Operation Manual

Digital Power Amplifier

DPA-300S/600S/900S/1200S

DPA-300SO/600SO/900SO/1200SO

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

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

DIGITAL POWER 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!

This s ym bol is intende d to a lert the user to t he

CAutION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

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.

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.

*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.

presence of uninsulated “dangerous voltage” within
the prod uct’s e nclosure that may be of suff icient
magnitude to constitute a risk of electric shock to
persons.

This s ym bol is intende d to a lert the user 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 ins ér ées à fo nd sans e n laisser auc un e pa rtie à
découvert.

DIGITAL POWER AMPLIFIER

Contents

Contents

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

Installation

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

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

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

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

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

Speaker Connection.......................................................................................................................7

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

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

Specifications ................................................................................................................................13

Service

Procedures....................................................................................................................................17

Schematic.....................................................................................................................................17

Parts List .......................................................................................................................................17

Variations and Options ...............................................................................................................17

Warranty .......................................................................................................................................17

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

1

DIGITAL POWER AMPLIFIER

Unpacking

Unpacking

Although your DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO 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

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

DIGITAL POWER AMPLIFIER

Features

Features

- High Performance Class-D Power PA Amplifier

High performance Class-D Power amplifiers produce 300/600/900/1200W rated power each channel.

- Emergency Power Back Up (24VDC) Capability

The unit operates on a DC24 V battery power supply for emergency back up without UPS (DPA-SO models are
not included with emergency power back Up (24VDC))

- Rated Output Power Via DC Backup Supply

Output power can be maintained as AC power when 24VDC power supplied.

- Advanced Power Circuitry Design

The combination Class-D type amplification circuitry combined with SMPS creates a high efficiency amplifier
offering reduced power consumption and low heat dissipation and weight.

- High Quality Sound Design

The total harmonic distortion is reduced to less than 0.03% THD, with a high signal to noise S /N ratio of over
103dB

- Advanced Protection Circuitry

Advanced protection circuitry guards against overheating, shorted outputs, DC output, overloads and
mismatched power

- A Variety of operation Indicators

Signal, -10dB signal level, Clip, Protection and system power (AC, DC, STBY) indicators

- Balanced Input

This connection is used to ensure the lowest noise operation which eliminates the common noise from the cable.

- Remote Power ON/OFF

The remote power allows the amplifier to be turned on or off from a distance or other device via dry contact
closure.

- PRIORITY Input

PGM is interrupted and over ridden by the Priority input, when a contact closure is received on the PRI select
terminal. This is Ideal for Emergency message broadcasting applications.

Accessories

Ac Power Cord x1
3P Terminal Block x1
2P Terminal Block x1
2P Terminal Block (Ac Remote power) x1
8P Terminal Block x1
Operation Manual x1
Screws for Rack mount Bracket x4

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

3

DIGITAL POWER AMPLIFIER

DPA

DIGITAL POWER AMPLIFIER

1200S

Front Panel

Front Panel

1. SYSTEM POWER INDICATORS

When Power switch is on, AC or DC LED will illuminate depending on input Power source. When Power
switch is off, STBY LED will illuminte.

※NOTE: During operation of DC, amplifier is keep going to work even if the switch of power is turned off.

Power SW Power LED AC LED STBY LED DC LED

SW ON ON ON OFF OFF

AC/DC

SW OFF OFF OFF ON OFF

SW ON ON ON OFF OFF

AC only

SW OFF OFF OFF ON OFF

SW ON ON OFF OFF ON

DC only

SW OFF ON OFF OFF ON

2. SIGNAL INDICATORS

The LEDS indicate the amplifier’s output signal levels.
SIG : Green, -10dB : Green, Clip : Yellow, PROTECT : Red

3. VOLUME CONTROL

Turn the volume controls clockwise to increase gain and counterclockwise to decrease gain.

4. COOLING VENTS

Air flow is front to back. DO NOT block front or rear air vents.

5. POWER SWITCH

4

Push on/off switch. When Power switch is on, BLUE LED will illuminate.

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

Rear Panel

O

UTPUT

VOLTAGE

+

-

G

P

GM INPUT

70V100V

O

UTPUT

+

-

G

1

COM

P

RIORITY

N.C

SW

INPUT

A

C INPUT

P

RIORITY

V

OLUME

MIN MAX

+

-

DC INPUT 21V-27V

MAX 60A

A

C POWER REMOTE

1 2 3 4 5 6

7 8 9

Rear Panel

DIGITAL POWER AMPLIFIER

1. AC MAINS (AC INLET)

It accepts a standard IEC mains cable, provided

2. DC INPUT TERMINAL

Emergency DC back up power (24VDC) terminal. When AC power is cut off, The unit will operate with DC
power from spare battery pack.
(DPA-SO models are not included with Emergency Power Back Up (24VDC))

3. AC POWER REMOTE

This terminal allows the amplifier to be turned on or off from a distance or other device.

4. COOLING VENTS

Air flow is front to back. DO NOT block front or rear air vents.

5. PRIORITY INPUT AND CONTACT CLOSURE

Each amplifier module has 2 audio inputs. The Primary program input, PGM and Priority input, PRI. The
primary regular broadcast program input, PGM is interrupted and over ridden by the Priority input, PRI,
when a contact closure is received on the PRI select terminal. This is Ideal for Emergency message
broadcasting applications.

6. PRI VOLUME CONTROL

It controls the mute level of all other input signal when the PRI IN signal is present.

7. OUTPUT TERMINAL

Speaker Output Terminal with Euro Block.

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

5

DIGITAL POWER AMPLIFIER

8. OUTPUT VOLTAGE SELECTOR

his two-position switch is used to select a output voltage (100V or 70V).

T

9. PGM INPUT CONNECTOR

Balanced 3-pin terminal block connector accept the source input.

6

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

DIGITAL POWER AMPLIFIER

10W 10W 10W 10W

....

Speaker Connection

Speaker Connection

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

※Caution: 1. Make sure that the total impedance does not equal or less than the rated impedance.

Speaker Output Speaker Impedance

100V / 33.3Ω

300W

600W

900W

1200W

2. Do not connects a speaker has lower impedance than rated impedance, It may cause the
problem to unit.

3. Do not put the speaker cable close to input signal cable.

70V / 16.3Ω

49V / 8Ω

100V / 16.6Ω

70V / 8.2Ω

69.3V / 8Ω

100V / 11.1Ω

70V / 5.4Ω

84.9V / 8Ω

100V / 8.3Ω

70V / 4.1Ω

98V / 8Ω

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

7

DIGITAL POWER AMPLIFIER

OUTPUT

VOLTAGE

+

-

G

P

GM INPUT

70V100V

OUTPUT

+

-

G

1

COM

P

RIORITY

N.C

SW

INPUT

AC INPUT

PRIORITY
VOLUME

M

IN MAX

+

-

DC INPUT 21V-27V

MAX 60A

AC POWER REMOTE

Applications

Applications

8

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

Block Diagram

Block Diagram

DPA-300S/600S

DIGITAL POWER AMPLIFIER

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

9

DIGITAL POWER AMPLIFIER

DPA-900S/1200S

10

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

PWM

PGM+

PGM-

GND

PGM

PGM VOLUME

PRI+

PRI-

GND

PRI

COM

1

SPEAKER OUTPUT

0dB

0dB

PRI VOLUME

+12dB

+12dB

P/C

LPF 35kHz GAIN= 0/-3dB

100/70 Vrms

PROTECTION

OCP, OTP

CLIP(RED)

SIG(GRN)

-10dB(GRN)

PFC

-VA

+VA

-HV

+HV

ST-BY

MAIN

RECTIFIER

AC

SMPS

100 / 70V SWITCH

PGM/PRI TOGGLE

2nd ORDER LPF

FAN

FAN CONTROL

FAN START 65

ŭ

PROTECT MORE THAN 85ŭ

TEMPERATURE DETECTION

+HV

-HV

DIGITAL POWER AMPLIFIER

DPA-300SO/600SO

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

11

DIGITAL POWER AMPLIFIER

100 / 70V SWITCH

PGM+

PGM-

GND

PGM

PGM VOLUME

PRI+

PRI-

GND

PRI

COM

1

-10dB(GRN)

SIG(GRN)

4th ORDER LPF

SPEAKER RELAY

PROTECTION

SPEAKER OUTPUT

0dB

0dB

+12dB

+12dB

P/C

PGM/PRI TOGGLE

LPF 25kHz GAIN= 0/-3dB

OCP, OTP

100/70 Vrms

CLIP(RED)

PRI VOLUME

-VA

+VA

-HV

+HV

AC

ST-BY

MAIN

RECTIFIER

SMPS

HPF 60Hz

PWM

FAN

FAN CONTROL

FAN START 65

ŭ

PROTECT MORE THAN 85ŭ

TEMPERATURE DETECTION

+HV

-HV

DPA-900SO/1200SO

12

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

DIGITAL POWER AMPLIFIER

Specifications

Specifications

DPA-300S DPA-600S DPA-900S DPA-1200S

Rated Output Power
(T.H.D 0.1%, AES17)

Peak Power 480W 680W 1050W 1260W

300W 600W 900W 1200W

Output Level/Impedance

Input Sensitivity 1V/10kΩ
T.H.D Rated Power Less than 0.1%

(AES17)

S/N (20kHz LPF) More than 103dB
Frequency Response (1W, ±3dB) 50Hz ~ 20kHz 60Hz ~ 20kHz
Operating Temperature -10°C ~ +40°C
Operating Power 120VAC, 60Hz, 220-240VAC, 50/60Hz

Power Consumption (1/8 Power) 130W 250W
Weight (SET) 6.5kg/14.3lb 6.6kg/14.6lb 7.7kg/17lb 7.7kg/17lb
Dimensions (SET) 482(W)x88(H)x397(D)mm 482(W)x88(H)x450(D)mm

* Design and specification are subject to be changed for the improvement of product quality without pre notice.

1/3 Power Less than 0.03%

100V/33.3Ω 100V/16.6Ω 100V/11.1Ω 100V/8.3Ω

70V/16.3Ω 70V/8.2Ω 70V/5.4Ω 70V/4.1Ω

49V/8Ω 69.3V/8Ω 84.9V/8Ω 98V/8Ω

DC 24V

19(W)x3.5(H)x15.6(D)in 19(W)x3.5(H)x17.7(D)in

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

13

DIGITAL POWER AMPLIFIER

PA-300SO DPA-600SO DPA-900SO DPA-1200SO

D

Rated Output Power
(T.H.D 0.1%, AES17)

Peak Power 480W 680W 1050W 1260W

Output Level/Impedance

Input Sensitivity 1V/10kΩ
T.H.D Rated Power Less than 0.1%

(AES17)

S/N (20kHz LPF) More than 103dB
Frequency Response (1W, ±3dB) 50Hz ~ 20kHz 60Hz ~ 20kHz
Operating Temperature -10°C ~ +40°C
Operating Power 120VAC, 60Hz, 220-240VAC, 50/60Hz
Power Consumption (1/8 Power) 130W 250W
Weight (SET) 6.1kg/13.5lb 6.1kg/13.5lb 6.3kg/13.7lb 6.3kg/13.7lb
Dimensions (SET) 482(W)x88(H)x397(D)mm / 19(W)x3.5(H)x15.6(D)in

* Design and specification are subject to be changed for the improvement of product quality without pre notice.

1/3 Power Less than 0.03%

300W 600W 900W 1200W

100V/33.3Ω 100V/16.6Ω 100V/11.1Ω 100V/8.3Ω

70V/16.3Ω 70V/8.2Ω 70V/5.4Ω 70V/4.1Ω

49V/8Ω 69.3V/8Ω 84.9V/8Ω 98V/8Ω

14

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

※ DIMENSIONS

PA-300S/600S, DPA-300SO/600SO/900SO/1200SO

D

DIGITAL POWER AMPLIFIER

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

15

DIGITAL POWER AMPLIFIER

440

420

482

88

PA-900S/1200S

D

16

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

DIGITAL POWER AMPLIFIER

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.

DPA-300S/600S/900S/1200S, DPA-300SO/600SO/900SO/1200SO

17

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-GU, SEOUL, KOREA
TEL : [phone]~8, FAX : [phone]
Home Page : http://www.inter-m.com, E-mail : [e-mail]

MADE IN KOREA

August 2013 133376