Inter-M PA-4000A User Manual

MADE IN CHINA

August 2008 123434

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]

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Operation Manual

Public Address Amplifier

PA-2000A/4000A/6000A

PA-4000A/6000A

PA-2000A

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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.

*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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PA-2000A/4000A/6000A

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.....................................................................................................................9

Applications ..................................................................................................................................10

Block Diagrams.............................................................................................................................11

Specifications................................................................................................................................12

Service

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

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

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

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

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

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Installation

Unpacking

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PA-2000A/4000A/6000A

Unpacking

Although your PA-2000A/4000A/PA-6000A 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

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S3125A

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PA-2000A/4000A/6000A

Features

Features

-

A PUBLIC ADDRESS AMPLIFIER WITH RATED OUTPUT OF 60W(PA-2000A), 120W(PA-4000A) or 240W(PA-6000A)

- SIX INPUT CHANNELS WITH ADJUSTABLE INPUT SENSITIVITY AND INDIVIDUAL LEVEL CONTROLS

Rear-panel level controls adjust each input channel from Mic to Aux level.

- FIVE-BAND GRAPHIC EQUALIZER

Five-band graphic equalizer allows you to shape the tonal balance of your program material.

- SPEAKER SELECT

Six speaker select switches enable you to select any combination of up to five speakers.

- PHONO LEVEL INPUT (CD Level Source for USA/CANADA & Associated Version)

Switchable input level on Channel 6 allows for connection of phono level source.

- ANNOUNCEMENT CHIME AND SIREN

Convenient four-tone chime and electronic siren for use with announcements.

- EXTERNAL MUTE FUNCTION

- TELEPHONE INPUT FUNCTION

Accessories

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

Operation

Operation

1. Do not connect the AC power until step 5. The ac mains POWER switch should be in the OFF position.

2. Adjust the MASTER and all CH 1-6 volume controls to the MIN Position (turn counterclockwise).

3. Adjust the graphic equalizer so that all sliders 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. With the ac mains POWER switch in the OFF position, confirm the voltage indication of voltage selector

switch with AC source.
Plug in the supplied AC mains power cord to the product and connect to an appropriate AC source.

6. Depress the ac mains POWER switch to the ON position. The indicator within the power switch will illuminate.

7. 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.

8. Operate the product and the system in a manner which DOES NOT illuminate the PEAK warning indicator.

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PA-2000A/4000A/6000A

Front Panel

Front Panel

1. 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.

2. 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.

3. OUTPUT LEVEL DISPLAY

This 10-segment LED meter indicates the amplifier’s output level in RMS.

4. CHANNEL 1 INPUT

This is an input jack for Channel 1. Inserting a connector into this front-panel jack will override (disconnect)
the signal connected to the rear-panel CH 1 jack.

5. CHANNEL 1 - CHANNEL 5 VOLUME

These knobs provide continuous control of the output volume of Channels 1-5.

6. CHANNEL 6/PHONO VOLUME (Channel 6/CD Volume for USA/CANADA & Associated Version)

This knob provides continuous control of the volume of Channel 6 or Phono Input, as selected by the
associated rear panel switch.

7. MASTER VOLUME

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

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PA-2000A/4000A/6000A

8. CHIME BUTTON

Pressing this switch activates the one shot chime.

9. SIREN BUTTON

Pressing this button will activate the siren circuitry. Pressing it a second time will gradually lower the siren
signal, turning it off completely after approximately 2.5 seconds.

10. SPEAKER SELECTOR

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

11. POWER SWITCH

Pressing this switch turns the unit on, as indicated by the Power LED above the switch. Pressing it again turns
the unit off.

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Rear Panel

Rear Panel

1. AC POWER INLET

Connect this inlet to your AC outlet.

2. VOLTAGE SELECTOR SWITCH (PA-6000A Only)

The PA-6000A has a multi-tap power transformer which allows it to be used around the world. Before
connecting the unit to AC power, confirm that the voltage selector switch setting on the rear of the unit is set to
the proper position and the fuse is the correct rating as listed on the rear of the system.
The PA-6000A will accept voltages from 115V or 230Volts, 50-60Hz when the voltage settings are set correctly.
NOTE: The PA-6000A UK, USA/CANADA Version is not used VOLTAGE SELECTOR SWITCH.

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PA-2000A/4000A/6000A

PA-6000A

PA-2000A/4000A

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PA-2000A/4000A/6000A

3. IMPEDANCE SELECTOR SWITCH

Selects between low impedance settings of 100V or 70V. Note that this switch is only active when the
speakers are connected to the COM terminal and one or more of the SP1-SP5 terminals. When the speakers
are connected to the COM terminal and either the 4Ω or 8Ω terminal, this switch is non-functional.

4. EXT CHIME

When these two terminals are shorted, the one shot chime is activated.

5. EXT MUTE

When these two terminals are shorted, signals from Input Channels 3-6, turntable is muted. Signals from
Channel 1, Channel 2, Link In and Chime are not muted.

6. TELEPHONE INPUT TERMINALS

These terminals are provided for connection with a telephone exchange system for paging purposes.

NOTE: When the telephone input is active, all other input signals except AMP IN are muted.

7. CH 6 INPUT

Channel 6 input is provided on dual RCA connectors, for use with a CD, Cassette or Phono input.

NOTE: When both inputs are used, the signal is summed and combined.

8. CH 1-5 INPUTS

Channel 1-5 inputs are provided on balanced XLR connectors.

9. 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, as shown below.
If the fuse continues to blow, refer servicing to a qualified service technician.

Impedance Ratings

Model

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

100 V 70 V 70V 25V
PA-2000A 165Ω 83Ω 83Ω 10.4Ω
PA-4000A 83Ω 42Ω 42Ω 5.2Ω
PA-6000A 41Ω 21Ω 21Ω -

AC Fuse Ratings

Model 100VAC – 120 VAC 220VAC-240VAC
PA-2000A 2A/250V 1A/250V
PA-4000A 4A/250V 2A/250V
PA-6000A 6.3A/250V 3.15A/250V

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PA-2000A/4000A/6000A

10. SPEAKER OUTPUT TERMINAL

These terminals connect up to five speakers in 4Ω, 8Ω or High Impedance mode.

NOTE: Only speakers connected to the High-Impedance terminals are controlled by the front-panel Speaker

Selector switches.

11. LINK OUT

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

12. PREAMP OUTPUT

This output connects the unit with an external power amplifier. Inserting a plug into the Preamp Out jack will
disconnect signal to the unit’s power amp, sending the output of the internal mixer to the external amplifier.

13. LINK IN

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

14. 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.

15. GND TERMINAL

This grounding terminal is provided for connecting with the chassis of a turntable or other input device to
reduce hum and other ground loop noise. It may also be connected to a true earth ground, such as an AC
third-pin ground or water pipe, to further reduce ground loop noise.

16. CH6/PHONO SELECTOR SWITCH

This switch is used to select the input level for Channel 6. When set to Mic/Aux position, CH6 input is set to
Mic/Aux level. When set to PHONO, CH6 input is at Phono level (The product is set to Mic/Aux position,
when is assembled).
NOTE: When the CH6 Input selector is set to PHONO, the input gain of CH6 is unaffected by that channel’s

Input Gain Control.
USA/CANADA & Associated Version is used CH6/CD SELECTOR SWITCH

17. INPUT GAIN CONTROLS

These knobs provide continuous control of the input levels for each of the six input channels. When adjusting
the input gain, make certain that the levels are not set too high, or distortion will result.

Impedance/Output Voltage

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

PA-2000A

4Ω/15.5V 8Ω/22V 83Ω/70V

165Ω/100V

4Ω/15.5V 8Ω/22V 10.4Ω/25V 83Ω/70V

PA-4000A

4Ω/22V 8Ω/31V 42Ω/70V

83Ω/100V

4Ω/22V 8Ω/31V 5.2Ω/25V 42Ω/70V

PA-6000A

4Ω/30V 8Ω/43V 21Ω/70V

41Ω/100V

4Ω/30V 8Ω/43V - 21Ω/70V

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PA-2000A/4000A/6000A

Connecting Speakers

Connecting Speakers

Before connecting speakers to your PA-2000A/4000A/6000A 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 negative (-) connectors to the COM terminal and
the positive (+) connectors to the 4Ω terminal. See Figure 1 below.

For 8Ω low-impedance speakers, connect in parallel, with the negative (-) connectors to the COM terminal and
the positive (+) connectors to the 8Ω terminal. See Figure 2 below.

For high-impedance systems, connect with matching transformer as per Figure 3 below. Be certain that the total
impedance does not equal less than the rated impedance.

FOR 4Ω TERMINAL FOR 8Ω TERMINAL

FOR HIGH IMPEDANCE TERMINAL

4Ω

8Ω

COM

SPEAKER OUTPUT

SP 1 SP 2 SP 3 SP 4 SP 5

4Ω

8Ω

8Ω

4Ω

8Ω

COM

SPEAKER OUTPUT

SP 1 SP 2 SP 3 SP 4 SP 5

8Ω

16Ω

16Ω

4Ω

4Ω

(Figure 1) (Figure 2)

(Figure 3)

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PA-2000A/4000A/6000A

Applications

Applications

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CD-610 or CD-660

PC-9335AD

MIXER

PC-9335AD

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PA-2000A/4000A/6000A

Block Diagrams

Block Diagrams

usaOcanada

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WPv
RUv

PA-6000A

PA-2000A/4000A

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usaOcanada

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PA-2000A/4000A/6000A

Specifications

Specifications

PA-2000A PA-4000A PA-6000A

Rated Output (RMS) 60W 120W 240W
Frequency CH 1~CH 6 120Hz-10kHz

Response

Telephone In 330Hz-3.3kHz
Link In 80Hz-12kHz
Amp In 60Hz-15kHz

T.H.D CH 1~CH 6, Phono Less than 1%

Telephone In, Link In Less than 0.5%
Amp In Less than 0.05% Less than 0.5%

S/N CH 1~CH 6 more than 50dB

Phono more than 55dB
(CD for USA/CANADA)

(more than 70dB)
Telephone In, Link In more than 65dB
Amp In more than 95dB

Graphic Equalizer
(100Hz,330Hz, 1kHz, 3.3kHz, 10kHz)

±12dB

Input Sensitivity

CH 1~CH 6 -70~-22dB/600Ω -70~-20dB/600Ω

/Impedance

Phono -54dB/22kΩ
(CD for USA/CANADA)

(-6dB/20kΩ)
Link In -20dB/15kΩ
Telephone In EC & Associated, JAPAN : -2dB(0.775V)/600Ω,

USA/CANADA & Associated : -10dB(0.3V)/600Ω

Amp In 0dB/47kΩ 0dB/4.7kΩ

Speaker Output

EC & Associated, 4Ω/15.5V

,

4Ω/22V 4Ω/30V

/Impedance JAPAN 8Ω/22V 8Ω/31V 8Ω/43V

83Ω/70V 42Ω/70V 21Ω/70V

165Ω/100V 83Ω/100V 41Ω/100V
USA/CANADA & 4Ω/15.5V 4Ω/22V 4Ω/30V
Associated 8Ω/22V 8Ω/31V 8Ω/43V

10.4Ω/25V

,

5.2Ω/25V -

83Ω/70V 42Ω/70V 21Ω/70V

,

Preamp Out/Impedance 0dB/600Ω
Link Out/Impedance -6dB/600Ω
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 95W 120W 180W
Weight 10kg/22lb 12kg/26lb 13.5kg/29.76lb
Dimensions

420(W)x100(H)x320(D)mm 420(W)x133(H)x320(D)mm

16.5(W)x3.9(H)x12.5(D)in 16.5(W)x5.2(H)x12.5(D)in

* Specifications and design subject to change without notice.

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PA-2000A/4000A/6000A

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.

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