Inter-m PA-60, PA-120, PA-240 Operation Manual

Operation Manual

Mixing Amplifier

PA-60/120/240

MIXING 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

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.

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK.

DO NOT REMOVE COVER (OR BACK).

O USER-SERVICEABLE PARTS INSIDE.

N

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

ATTENTION : RISQUE DE CHOC ELECTRIQUE

NE PAS QUVRIR

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.
*Warning : To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture and objects filled with liquids, such as vases,

should not be placed on this apparatus.
*This apparatus shall be connected to a mains socket outlet with a protective earthing connection.

To completely disconnect this apparatus from the AC mains, disconnect the power supply cord plug from the AC receptacle.

*
*

The mains plug of the power supply cord shall remain readily accessible.

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 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.
Pour decon ne ct er c ompleteme nt l ’a pp areil du reseau
d’alimentation. deconnecter le cordon d’alimentation de la
prise murale.
La prise du reseau d’alimentation doit demeurer aisement
accessible.

MIXING AMPLIFIER

Contents

Contents

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

Installation

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

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

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

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

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

Speaker Connection.......................................................................................................................9

System Connection.......................................................................................................................11

Block Diagram ..............................................................................................................................12

Specifications ................................................................................................................................14

Dimensions ...................................................................................................................................15

Service

Procedures....................................................................................................................................16

Schematic.....................................................................................................................................16

Parts List .......................................................................................................................................16

Variations and Options ...............................................................................................................16

Warranty .......................................................................................................................................16

PA-60/120/240

1

MIXING AMPLIFIER

S3125A

Unpacking

Unpacking

Although your PA-60/120/240 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.
Please put enough space between wall and equipment when you install this equipment.
(Sides/Back - 20cm, Top - 30cm)

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-60/120/240

Features

Features

- 2U Size

- 60W /120W / 240W output power

- 5 Microphone/Line Inputs, Stereo Line Input and TEL IN with individual volume control

- EXT Input and MIX Output

- Input Signal LED Indicator per channel

- Output Level LED Display

- BASS/TREBLE Tone Controls

- 5 Speaker Zone Selection Switches

- PRIORITY

MIXING AMPLIFIER

- EXT MUTE. EXT CHIME

- CHIME and SIREN

Operation

Operation

1. Make sure the power switch on the front of the unit is set to off and connect the power cord to the mains
outlet. Please set each input volume control and master volume control to minimum position and set the tone
controls to 0dB before turning on the power switch.

2. Make sure the speaker cables and input cables are properly connected.

3. Before connecting power, always check the voltage of main power supply.
(AC 230V/50Hz or AC 240V/50Hz or AC 120V/60Hz)

4. After completing all connections, turn on the power switch, and check to confirm that the power indicator
lights.

5. Use input level control for corresponding to desired mixing volume levels and set the output level with master
volume control.

6. Use the Treble/Bass tone controls to change the tone of the output source.

PA-60/120/240

3

MIXING AMPLIFIER

Front Panel

Front Panel

1. INPUT LEVEL CONTROL

Control the level of each of the six input channels.

2. INPUT SIGNAL INDICATOR

These LEDs light when each of the input signal is present.

3. CHIME SWITCH

It activates the four tone chime circuitry. The chime indicator lights when chime is being activated.

4. SIREN ON/OFF SWITCH

When this switch is pressed, siren signal is outputted. Press this switch once again to, stop the siren.
The siren indicator lights when siren is being activated.

5. TONE CONTROL

Control the bass (100Hz) and treble (10KHz) tones of the main amplifier output and the MIX output.

6. PROTECTION INDICATOR

Indicated that the amplifier is in protection mode.

7. MASTER VOLUME CONTROL

The master volume control to collectively control the sound level of all outputs and by turning the knob
clockwise to increase the volume and counterclockwise to decrease it.

8. POWER SWITCH

Press the power switch to turn on the power.

4

PA-60/120/240

MIXING AMPLIFIER

. POWER INDICATOR

9

This LED Lights when the unit is powered on.

10. SPEAKER ZONE SELECTION SWITCH

Use the speaker zone selection switches to route the program audio from the amplifier output to speaker
zone 1 through zone 5. The 'ALL' switch turns on all zones. The Indicators light when speaker zone selection
switches are on.

* When power goes off and back on, speaker zone selection switches are set as a setting of 'SPEAKER PRESET'

switch of rear panel.
* When 'ALL' switch is on, signals are out in all zones regardless of the status of SP1~SP5 switch.
* When 'ALL' switch is on, LEDs of the turned-off speaker zones light half, Half-lit speaker zones will be turned

off when 'ALL' switch is off.

Ex)

11. OUTPUT LEVEL DISPLAY

STEP ALL SP1 SP2 SP3 SP4 SP5 Output

1 OFF ON OFF ON OFF OFF 1,3 Zones
2 ON ON Half-lit ON Half-lit Half-lit All Zones
3 OFF ON OFF ON OFF OFF 1,3 Zones

Displays the output level meter, each bar is marked in intervals of 3 to 4dB.

PA-60/120/240

5

MIXING AMPLIFIER

101112

Rear Panel

Rear Panel

1. AC MAINS (AC INLET)

It accepts a standard IEC mains cable, provided.

2. TEL IN TERMINAL

This terminal is provided for connection with a telephone exchange system for paging purposes.

※NOTE : When the telephone input is present, all other input signals are muted.

3. TEL IN VOLUME CONTROL

It controls the volume of the TEL IN.

4. TEL IN PRIORITY MUTE CONTROL (TEL IN MUTE)

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

5. EXT IN

This is an unbalanced line-level input connects an external mixer to the amplifier expanding input channels.
Pin arrangement is +, G, FG (Frame Ground).
Please use 2-Conductor Braided Shield cable, and connect shield wire to FG (Frame Ground)

6. INPUT 1~6

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

1) INPUT 1~3 are provided on balanced XLR Jacks and EURO Terminals. Each input has a 3 position level and phantom
power selector switch.

- LINE: used for the LINE level signal input.

- MIC: used for the MIC level signal input such as dynamic mics.

- PHANTOM: used for the condensor type mics with DC19-21V phantom power.

*NOTE : XLR Jacks and EURO Terminals of INPUT 1~3 are bridged internally.

Therfore, DO NOT CONNECT THESE SIMULTANEOUSLY.

*NOTE : Please set level selector switch to the ‘LINE’ position when each INPUT 1~5 is not in use

6

PA-60/120/240

MIXING AMPLIFIER

2) INPUT 4~5 are provided on balanced EURO Terminals. Each input has a 2 position level selector switch.

- LINE: used for the LINE level signal input.

- MIC: used for the MIC level signal input such as dynamic mics.

3) INPUT 6 is provided on stereo summing RCA Jacks.

7. PRIORITY CONTROL VOLUME (PRIORITY MUTE)

The output signal level of INPUT 3~6 are controlled by the priority control volume when the signal is inputted to
the INPUT 1~2, EXT IN, CHIME and SIREN or EXT MUTE terminal is closed.

※The signal from INPUT 1~2, EXT IN, CHIME, SIREN input has priority over all other input signal and BGM

broadcasting.

8. EXT MUTE

When these two terminals are shorted, output signal level of INPUT 3~6 is diminishes as much as the volume
value controlled by the PRIORITY CONTROL VOLUME(PRIORITY MUTE).

9. EXT CHIME

This terminal is used to activate the 4 tone chimes remotely.

10. MIX OUT

This is an unbalanced line-level output connects the other amplifier recorder.
Pin arrangement is +, G, FG (Frame Ground).
Please use 2-Conductor Braided Shield cable, and connect shield wire to FG (Frame Ground)

11. SPEAKER PRESET SWITCH

When power goes off and back on, speaker zone selection switchs on the front pannel are set as a setting
of SPEAKER PRESET switch.

12. SPEAKER OUTPUT TERMINAL

SP1~SP5 • COM Terminals

8/4Ω Terminal

PA-60 8~4Ω 100V/167Ω 70V/82Ω
PA-120 8~4Ω 100V/84Ω 70V/41Ω
PA-240 8~4Ω 100/42Ω 70V/21Ω

※ Please note that SP1~SP5 output voltage (100V or 70V) is different as the region.
※ Please note that SP1~SP5 terminal will be controlled by the speaker zone selection switch of front panel.
※ When SP1~SP5 (100V or 70V) is in use, the '8/4Ω+' terminal and 'OPT IN' terminal must be bridged

together (Only for PA-60/120).

100V region 70V region

PA-60/120/240

7

MIXING AMPLIFIER

8/4 8/4

※ Please do not use 8/4Ω output terminal and SP1~SP5 (100V or 70V) output terminals at the same time.

8

PA-60/120/240

Speaker Connection

MATCHING

TRANS

MATCHING

TRANS

8/4 8/4

8/4

8/4

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.

8/4Ω+, 8/4Ω- Terminal

Low Impedance Speaker Connection

MIXING AMPLIFIER

SP1~SP5COM Terminals

High Impedance Speaker Connection

8Ω or 4

Ω Speaker

 Warning
When SP1~SP5 (100V or 70V) is in use, the '8/4Ω+'
terminal and 'OPT IN' terminal must be bridged
together (Only for PA-60/120).

PA-60/120/240

9

MIXING AMPLIFIER

※Warning : For high impedance systems, connect with matching transformer as the following Figure.

e certain that the total impedance is not less than the rated impedance.

B

※Warning : Please do not use 8/4Ω output terminal and SP1~SP5 (100V or 70V) output terminals at the same time.

*NOTE : Please note that SP1~SP5 output voltage (100V or 70V) is different as the region.

10

PA-60/120/240

System Connection

AMPSPK

MIXER

System Connection

MIXING AMPLIFIER

PA-60/120/240

11

MIXING AMPLIFIER

PROTECTION CI RCUIT

TEMP SENS

-50/-10dBu

INPUT 1

-

+

-50/-10dBu

INPUT 2

+

-

-50/-10dBu

INPUT 3

-

+

INPUT 6

-10dBu

-50/-10dBu

-50/-10dBu

INPUT 4

INPUT 5

SPEAKER ZONE CONTROL CIRCUIT

KEY IN

SP REALY

CLASS D AMPLIFIER

MASTER

VOLUME

SPEAKER ZON E INDICATOR

SP ALL

SP 5

SP 4

SP 3

SP 2

SP 1

INPUT 6 LEVEL

AMP BUFF

TEL IN LEVEL

INPUT SIGNA L DISPLAY

INPUT 3INPUT 2INPUT 1

INPUT 6INPUT 5INPUT 4

SIG SIGSIG

SIG SIG

SIGNAL DETECTION

TEL IN

INPUT 5 LEVEL

INPUT 4 LEVEL

INPUT 3 LEVEL

INPUT 2 LEVEL

INPUT 1 LEVEL

SIGNAL DETECTION

INPUT 1-2, EXT IN

GAMIX

EXT IN

0dBU

TONE CONTROL

SIG

CHIME

(100Hz, 10kHz)

MIX

BUFF

LPF

HPF

MUTE

MUTE

GA

SIREN

CHIME, SIREN

PRESET 1

PRESET 2

PRESET 3

PRESET 4

PRESET 5

PRESET IN

CHIME SWITCH

SIREN SWITCH

MUTE CONTROL

-3-6 0-9-12-16-20

PROT

LEVEL METER

LED DRIVER

SPEAKER TERM IANL

SP1

SP2

SP3

SP4

SP5

COM

OPT IN

8 / 4 OHM +

COM

8 / 4 OHM -

PA-120

PA-60

AMP

MIC/LINE

Vph

PHANTOM POWER

AMP

MIC/LINE

PHANTOM POWER

Vph

AMP

MIC/LINE

Vph

PHANTOM POWER

AMP

MIC/LINE

MIC/LINE

MIX

AMP

+

-

MIX

0dBU

MIX OUT

OPT

CHIME

SIREN

+15V

-15V

B+

B-

AC IN

POWER SW ITCH

PWR

P/T

RECTIFIER

CIRCUIT

FUSE

+S2

+5V

Vth

0dBu

TEL IN

EXT MUTE

CONTACT INPUT

EXT CHIME

CONTACT INPUT

Block Diagram

Block Diagram

A-60/120

P

12

PA-60/120/240

Block Diagram

8 / 4 OHM -

8 / 4 OHM +

SPEAKER TERMI ANL

SP1

SP2

SP3

SP4

SP5

COM

COM

-

+

+

-

-

+

SPEAKER ZONE CONTROL CIRCUIT

KEY IN

SP REALY

MASTER

VOLUME

SPEAKER ZONE INDICATOR

INPUT 6 LEVEL

AMP

0dBu

TEL IN

BUFF

TEL IN LEVEL

INPUT SIGNAL DI SPLAY

INPUT 3INPUT 2INPUT 1

INPUT 6INPUT 5INPUT 4

SIG SIGSIG

SIG SIG

SIGNAL DETECTION

TEL IN

INPUT 5 LEVEL

INPUT 4 LEVEL

INPUT 3 LEVEL

INPUT 2 LEVEL

INPUT 1 LEVEL

SIGNAL DETECTION

INPUT 1-2, EXT IN

GAMIX

EXT IN

0dBU

TONE CONTROL

SIG

CHIME

(100Hz, 10kHz)

MIX

BUFF

LPF

HPF

MUTE

MUTE

GA

SIREN

CHIME, SIREN

PRESET 1

PRESET 2

PRESET 3

PRESET 4

PRESET 5

PRESET IN

CHIME SWITCH

SIREN SWITCH

MUTE CONTROL

-3-6 0-9-12-16-20

PROT

LEVEL METER

LED DRIVER

INPUT 6

-10dBu

-50/-10dBu

INPUT 3

-50/-10dBu

INPUT 2

-50/-10dBu

-50/-10dBu

AMP

MIC/LINE

-50/-10dBu

INPUT 1

Vph

PHANTOM POWER

AMP

MIC/LINE

PHANTOM POWER

Vph

AMP

MIC/LINE

Vph

PHANTOM POWER

AMP

MIC/LINE

INPUT 4

INPUT 5

MIC/LINE

MIX

AMP

+

-

TEMP SENS

PROTECTION CIR CUIT

MIX

0dBU

MIX OUT

CHIME

SIREN

+5V

+S2

FUSE

CIRCUIT

RECTIFIER

P/T

PWR

POWER SW ITCH

AC IN

B-

B+

-15V

+15V

OPT

CLASS D AMPLIFIER

CLASS D AMPLIFIER

SP ALL

SP 5

SP 4

SP 3

SP 2

SP 1

Vth

EXT CHIME

EXT MUTE

CONTACT INPUT

CONTACT INPUT

Block Diagram

A-240

P

MIXING AMPLIFIER

PA-60/120/240

13

MIXING AMPLIFIER

Specifications

Specifications

●100V/70V High-Z Output

Rated Output Power (@1kHz, THD 1%) 60W 120W 240W
Frequency Response (@ 1W, Rated Load, ±3dB) 80Hz ~ 17kHz

THD (@ Rated Power, 1kHz) Less than 1%
S/N (Line input) more than 78dB

TONE CONTROL (100Hz, 10kHz, ±3dB) ±10dB

Input Sensitivity / Impedance

INPUT 1~5

PA-60 PA-120 PA-240

MIC -50dBu / 2kΩ (Balance)

LINE -10dBu / 2kΩ (Balance)

INPUT 6 -10dBu / 10kΩ (Balance)

TEL IN 0dBu / 10kΩ (Balance)

EXT IN 0dBu / 20kΩ (Unbalance)

MIX OUT / Impedance 0dBu / 10kΩ (Unbalance)

100V region 100V / 167Ω 100V / 84Ω 100V / 42Ω

Speaker Output Level/Impedance

70V region 70V / 82Ω 70V / 41Ω 70V / 21Ω

●8/4Ω Output

Rated Output Power
(@1kHz, THD 1%)

Frequency Response (@ 1W, 8Ω, ±3dB) 80Hz – 20kHz

●General Specifications

Operation Temperature -10℃ ~ +40℃

Power Source

Power Consumption (1/8W output) 40W 60W 90W

Weight (SET) 6.2kg / 13.7Ib 7.4kg / 16.3Ib 9.8kg / 21.6Ib

8Ω 40W 120W 180W
4Ω 60W 160W 240W

AC 120V/60Hz or AC 230V/50Hz or AC 240V/50Hz

(Supplied AC mains transformer depends on contrary

requirements)

Dimensions (SET)

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

* Plese note that High-Z SP1~SP5 output voltage (100V or 70V) is different as the region.

14

PA-60/120/240

420(W) x 88(H) x 319(D)mm

16 .5 ( W) x3 . 5( H )x 12 . 6( D)i n

※ DIMENSIONS

4

20.0

88.0

319.0

MIXING AMPLIFIER

3

PA-60/120/240

PA-60/120/240

15

MIXING 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.

16

PA-60/120/240

MIXING AMPLIFIER

NOTE

PA-60/120/240

3

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

MADE IN KOREA

March 2015 137038