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PAM-240A/360A Public Address Amplifier
CLIP
PROT
0
6
8
11
14
19
CHANNEL 6CHANNEL 5CHANNEL 4CHANNEL 3CHANNEL 2CHANNEL 1
MIN MAX
BASS TREBLE
-12dB +12dB -12dB +12dB
MIN MAXMIN MAXMIN MAXMIN MAXMIN MAXMIN MAX
MASTER
CHIME
SP 1 SP 2 SP 3 SP 4 SP 5 ALL
SPEAKER SELECTOR
POWER
ON OFF
Page 2
Contents
Contents
Welcome
Warning.........................................................................................................................................1
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 Diagram ..............................................................................................................................11
Specifications ................................................................................................................................12
Service
Procedures....................................................................................................................................13
Schematic.....................................................................................................................................13
Parts List .......................................................................................................................................13
Variations and Options ...............................................................................................................13
Warranty .......................................................................................................................................13
Page 3
1
PAM-240A/360A
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.
*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 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.
Page 4
2
PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
Unpacking
Although your PAM-240A or PAM-360A 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
S3125A
Page 5
3
PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
Features
Features
- MODULAR DESIGN
Optional modules can be installed in multiple configurations for convenience and ease of use. Choose the
PAM-CDA (Compact Disc), PAM-T (AM/FM Tuner) or PAM-D (Cassette Deck) modules to expand the
PAM-240A/360A’s audio capabilities.
- INDIVIDUAL INPUT GAIN CONTROLS
Rear-panel gain controls for each input channel for total control of individual levels.
- SPEAKER SELECT
Six speaker select switches enable you to select any combination of up to five speakers.
- SELECTABLE PRIORITY MUTING
Switchable audio signal priority for Channels 1 and 2, Chime and Telephone input over other input sources.
- TELEPHONE INPUT/MUSIC-ON-HOLD
Telephone input for connection with telephone system. Music-on-Hold function available with optional PAM-T
AM/FM tuner module.
- REMOTE CONTROL INPUT
Individual speaker zones can be selected and chime can be operated by wired remote control.
- ANNOUNCEMENT CHIME
Convenient four-tone chime for use with announcements.
- EM(EMERGENCY) - OPTIONAL EMERGENCY VOICE IC
When EM switch is pressed in emergencies, EM broadcasting stored in VOICE IC is outputted.
Accessories
One detachable AC power cord is provided for use with this product.
Operation
Operation
Make certain that speakers and input sources are properly connected before switching on.
Keep volume levels turned down before switching on.
NOTE: The system’s operation is delayed by approximately three seconds after pressing the power switch. This is
due to the built-in protection circuitry, designed to protect the speakers and other system components.
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PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
Front Panel
Front Panel
1. MODULE BAYS
These panels provide for installation of optional PAM-CDA, PAM-T or PAM-D Modules, via the unit’s internal
connectors.
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 seven-segment LED meter indicates the amplifier’s output level in RMS.
4. CHANNEL 1-6 VOLUME
Controls the individual volume levels of Channels 1-6.
5. TONE CONTROL
Individual Bass and Treble controls are used to cut (decrease) or boost (increase) the lower and higher
frequencies ±12dB.
6. MASTER VOLUME
This rotary switch controls the overall output volume of the amplifier’s output signal.
7. CHIME BUTTON
Pressing this switch activates the chime circuitry.
SP 1 SP 2 SP 3 SP 4 SP 5 ALL
CHANNEL 6CHANNEL 5CHANNEL 4CHANNEL 3CHANNEL 2CHANNEL 1
POWER
BASS TREBLE
CHIME
MIN MAX
-12dB +12dB -12dB +12dB
MASTER
MIN MAX
MIN MAXMIN MAXMIN MAXMIN MAXMIN MAX
SPEAKER SELECTOR
ON OFF
6
3
1
89
4
2
7
5
PROT
-
8
-
11
-
14
-
19
-
6
0
CLIP
PUBLIC ADDRESS AMPLIFIER
PAM
240A
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5
PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
8. SPEAKER SELECTOR
These switches are used to select output to any combination of up to five individual speakers.
9. 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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PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
Rear Panel
Rear Panel
1. SPEAKER OUTPUT TERMINAL STRIP
Connect up to five individual speakers to this strip.
Impedances for 70V and 100V operation are shown below. Connect speakers whose combined impedance
is equal to or higher than the rated output impedance, as shown below.
2. IMPEDANCE SELECTOR
Selects between high impedance (100V) operation for standard applications and low impedance (70V)
operation for distributed systems.
3. ANTENNA CONNECTOR (OPTIONAL)
This terminal is used to connect the antenna, when used with the optional PAM-T AM/FM Tuner module.
4. EQ CONTROLS
Three-band equalization control provides ±12dB of cut (decrease) or boost (increase) over the high, mid and
low frequency ranges of the individual channel signals.
HIGH – 10kHz, ±12dB
MID – 1kHz, ±12dB
LOW – 100Hz, ±12dB
REMOTE
CH 1
PHANTOM
PRIORITY
CH 2
PHANTOM
PRIORITY
CH 3
PHANTOM
CH 4
PHANTOM
CH 5
PHANTOM
CH 6
PHANTOM
LINK OUT LINK IN
PREAMP OUT AMP IN
SPEAKER SELECTOR
SP 4SP 5 SP 3 SP 2 SP 1
EXT
MUTE
TELINMUSIC
ON
HOLD
EXT
CHIME
IMPEDANCE SELECTOR
S
N
W/MIC
ANT B
W/MIC
ANT A
COM
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
EM
100V
(41.7
Ω)
70V
(20.4Ω)
FM COM AM
1
15131211
10
8
14
18
20
19
54
2
63
16 17
7
9
AC FUSE
T4AL/250V
~AC INPUT
230V 50Hz, 260W
MODEL 70V 100/250V
PAM-240A 20.4Ω 41.7Ω
PAM-360A 13.6Ω 27.8Ω
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PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
5. PHANTOM POWER SWITCH
This switch turns the phantom power supply on or off for all channels. When the switch is turned on, +24V
DC power is supplied to pins 2 and 3 of each channel’s input connector.
Use phantom power when connecting condenser microphones, which require an external power supply.
NOTE: It is safe to connect most modern dynamic microphones or line level devices to the channel inputs
when phantom power is activated. However, some older ribbon microphones may be damaged by
phantom power, and certain unbalanced line level devices may malfunction or produce an audible
hum when phantom power is active.
6. PRIORITY SWITCH
When selected, these switches will give priority to Channels 1 and/or 2 over all other channels and audio inputs.
7. EM
When EM switch is connected and pressed in fire or other emergencies, EM broadcasting stored in VOICE IC
is outputted.
* Remove an input jack from AMP IN not to affect Emergency signal to be played or adjust the main audio
signal to adequate level for emergency broadcasting.
8. EXT CHIME
When these two terminals are shorted by wired remote (see item 14 above), the four-tone chime circuitry is
activated.
9. EXT MUTE
When these two terminals are shorted by wired remote (see item 14 above), signals from Input Channels 3-6
and any optional modules are muted. Signals from Channel 1, Channel 2, Link In and Chime are not muted.
10. AC POWER INPUT
Connect a standard three-pin AC cable to this connector.
11. TELEPHONE INPUT TERMINALS
These terminals can be connected to a telephone exchange system for paging purposes.
NOTE: When an active signal is sent through the telephone input, all other input signals except for AMP IN
are muted.
12. MUSIC-ON-HOLD TERMINALS (PAM-T AM/FM TUNER MODULE ONLY)
These terminals, along with the Telephone Input Terminals (11), are used for connecting with an external
telephone system. When used with the optional PAM-T module, these terminals supply music-on-hold to the
telephone system.
NOTE: When the tuner is turned on, signal from the tuner is constantly sent to these terminals, and is
unaffected by the Master Volume or the PAM-T’s volume control.
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PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
13. 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, as shown below.
If the fuse continues to blow, refer servicing to a qualified service technician.
14. REMOTE CONTROL INPUT
By connecting a 15-pin D-SUB connector, it is possible to control speaker zone selection and activate the
chime via wired remote. Connection terminals for the remote are shown below.
15. 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.
16. 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.
17. LINK OUT
This line-level output connects the unit with an external mixdown deck or other recording source.
18. LINK IN
This line-level input connects the unit with an external mixer for expanded input channels.
19. CHANNEL INPUTS 1-6
These balanced three-pin XLR connectors accept a standard microphone cable or other low impedance
signal. Optional transformer balanced inputs are also available.
20. 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.
The approximate levels for these controls are as follows:
Pin 1: Remote amplifier input signal hot(+) Pin 8: Remote control 5(Speaker 5)
Pin 2: Remote amplifier input signal cold(–) Pin 9: Remote control ground
Pin 3: Signal ground Pin 10: DC +24V
Pin 4: Remote control 1(Speaker 1) Pin 11: Input Chime
Pin 5: Remote control 2(Speaker 2) Pin 12: NC
Pin 6: Remote control 3(Speaker 3) Pin 13: NC
Pin 7: Remote control 4(Speaker 4) Pin 14, 15: NC
MIC mic level (-50dB ~ -60dB)
MIC ATT instrument level (-30dB ~ -50dB)
AUX line level (-20dB ~ -30dB)
AC Fuse Ratings
MODEL 100VAC – 120VAC 230VAC – 240VAC
PAM-240A 6.3A/250V 4A/250V
PAM-360A 8A/250V 4A/250V
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PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
Connecting Speakers
Connecting Speakers
Before connecting speakers, disconnect the AC power cable. Note the proper connecting terminals as shown
below. Make certain that the total impedance is not less than the rated impedance indicated.
- CONNECTING HIGH-VOLTAGE DISTRIBUTED SPEAKER SYSTEMS
WARNING: Extreme care must be exercised when connecting low-impedance systems, as potentially hazardous
voltages may be present at these terminals.
Do not install this equipment in a confined space with less-than-adequate ventilation.
Total rated input of up to 240W(PAM-240A) or 360W(PAM-360A)
15Wx24 units(360W)
When connecting a low-impedance (70V/100V) speaker system in parallel, you can connect speakers
with a total rated input of up to 240W (PAM-240A) or 360W (PAM-360A).
For example, if you are connecting speakers with a rated input of 15W, you can connect up to 24
speakers in parallel, as shown below:
SPEAKER SELECTOR
SP 5 SP 4 SP 3 SP 2 SP 1
10W 10W10W10W
COM
SPEAKER SELECTOR
SP 5 SP 4 SP 3 SP 2 SP 1
15W 15W15W15W
COM
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PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
Applications
Applications
REMOTE
CH 1
PHANTOM
PRIORITY
CH 2
PHANTOM
PRIORITY
CH 3
PHANTOM
CH 4
PHANTOM
CH 5
PHANTOM
CH 6
PHANTOM
LINK OUT LINK IN
PREAMP OUT AMP IN
SPEAKER SELECTOR
SP 4SP 5 SP 3 SP 2 SP 1
EXT
MUTE
TELINMUSIC
ON
HOLD
EXT
CHIME
IMPEDANCE SELECTOR
S
N
W/MIC
ANT B
W/MIC
ANT A
COM
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
TRIM
LOW
MID
HIGH
+12
-12
+12
-12
+12
-12
-60
-16
EM
100V
(41.7
Ω)
70V
(20.4Ω)
FM COM AM
AC FUSE
T4AL/250V
~AC INPUT
230V 50Hz, 260W
Page 13
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PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
Block Diagram
Block Diagram
Page 14
12
PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
Specifications
Specifications
- AMPLIFIER SECTION
Rated Output Power (THD 1%)................................................................................PAM-240A : 240W (RMS)
........................................................................................................................PAM-360A : 360W (RMS)
Frequency Response..................................................................................................................80Hz~20kHz
T.H.D.(at 1kHz Half Power Output)..............................................................................................Less than 1%
S/N....................................................................................................................................Better than 95dB
Input Sensitivity/Impedance
CH1~CH6 ..................................................................................................................1mV~160mV/600Ω
Link In .................................................................................................................................100mV/10kΩ
Telephone In........................................................................................................................0.775V/600Ω
Amp In.......................................................................................................................................1V/20kΩ
Remote In ...................................................................................................................1mV~160mV/600Ω
Speaker Output/Impedance ...................................................PAM-240A : 240W, 70V/20.4Ω, 100V/41.7Ω
........................................................................................PAM-360A : 360W, 70V/13.6Ω, 100V/27.8Ω
Preamp Out/Impedance ................................................................................................................1V/600Ω
Music on Hold/Impedance ......................................................................................................0.775V/600Ω
Link Out/Impedance ...............................................................................................................500mV/600Ω
Tone Control (100Hz, 10kHz)..............................................................................................................±12dB
EQ Control (100Hz, 1kHz, 10kHz) ......................................................................................................±12dB
- GENERAL
Power Source ..............................................................................100–120VAC or 220V–240VAC; 50/60Hz
..............................................................(Supplied AC mains transformer depends on country requirements)
Power Consumption ........................................................................................................PAM-240A : 260W
.....................................................................................................................................PAM-360A : 360W
Weight .................................................................................................................PAM-240A : 11kg/24.3lb
........................................................................................................................PAM-360A : 13kg/28.7lb
Dimensions........................................................420(W) x 132(H) x 360(D)mm/16.5(W) x 5.2(H) x 14.2(D)in
* Specifications and design subject to change without notice.
Page 15
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PAM-240A/360A
PUBLIC ADDRESS AMPLIFIER
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.
Page 16
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.
1 EAST BEACON LIGHT LANE CHESTER, PA USA 19013-4409
TEL : 1-610-874-8870, FAX : 1-610-874-8890
Home Page : http://www.inter-m.net, E-mail : service@inter-m.net
INTER-M Corporation
SEOUL OFFICE:653-5 BANGHAK-DONG, DOBONG-KU, SEOUL, KOREA
TEL : 82-2-2289-8140~8, FAX : 82-2-2289-8149
Home Page : http://www.inter-m.com, E-mail : export@inter-m.com
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