Inter-m A-60 User manual

A-60/120 Public Address Amplifier
PUBLIC ADDRESS AMPLIFIER
A-60
PROT
-14
MIN MAX
MASTER
MIN MAX
MIC 2 POWER
MIN MAX
MIC 1
MIN MAX
MIC 3
-12dB +12dB
TREBLE
MIN MAX
AUX 1
MIN MAX
AUX 2
-12dB +12dB
BASS
-10
-7
-3
0
+3
ON OFF

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 .......................................................................................................................................5
Connecting Speakers.....................................................................................................................6
Applications ....................................................................................................................................7
Block Diagram ................................................................................................................................8
Specifications ..................................................................................................................................9
Service
Proce ures....................................................................................................................................10
Schematic.....................................................................................................................................10
Parts List .......................................................................................................................................10
Variations and Options ...............................................................................................................10
Warranty .......................................................................................................................................10

1
A-60/120
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 e icate to provi ing excellent pro ucts with inherently goo value,
an we are elighte you have purchase one of our pro ucts.
We sincerely trust this pro uct will provi e years of satisfactory service, but if anything is not to your complete
satisfaction, we will en eavor to make things right.
Welcome to Inter-M, an thank you for becoming part of our worl wi e exten e family!
ISK OF ELECT IC SHOCK
DO NOT OPEN
CAUTION
CAUTION: TO EDUCE THE ISK OF ELECT IC SHOCK.
DO NOT EMOVE COVE (O BACK).
NO USE -SE VICEABLE PA TS INSIDE.
EFE SE VICING TO QUALIFIED SE VICE PE SONNEL.
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: “WA NING FO YOU P OTECTION PLEASE EAD THE FOLLOWING-WATE AND MOISTU E: 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.

2A-60/120
PUBLIC ADDRESS AMPLIFIER
Unpacking
Although your A-60/120 is neither complicate nor ifficult to operate, we recommen you take a few minutes
to rea this brief manual an familiarize yourself with the important information regar ing pro uct features,
setup an operation.
As with most electronic evices, we strongly recommen you retain the original packaging. In the unlikely event
the pro uct must be returne for servicing, the original packaging (or reasonable equivalent) is require .
Installation
Installation
Environment
Never place this pro uct in an environment which coul alter its performance or re uce its service life. Such
environments usually inclu e high levels of heat, ust, moisture, an vibration.
Important Safety Instructions
1. Rea these instructions.
2. Keep these instructions.
3. Hee all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with ry cloth.
7. Do not block any ventilation openings. Install in accor ance with the manufacturer’s instructions.
8. Do not install near any heat sources such as ra iators, heat registers, stoves, or other apparatus (inclu ing
amplifiers) that pro uce heat.
9. Do not efeat the safety purpose of the polarize or groun ing-type plug. A polarize plug has two bla es
with one wi er than the other. A groun ing type plug has two bla es an a thir groun ing prong. The wi e
bla e or the thir prong are provi e for your safety. If the provi e plug oes not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
10. Protect the power cor from being walke on or pinche particularly at plugs, convenience receptacles, an
the point where they exit from the apparatus.
11. Only use attachments/accessories specifie by the manufacturer.
12. Use only with the cart, stan , tripo , bracket, or table specifie by the manufacturer, or sol with the apparatus.
When a cart is use , use caution when moving the cart/apparatus combination to avoi injury from tip-over.
13. Unplug this apparatus uring lightning storms or when unuse for long perio s of time.
14. Refer all servicing to qualifie service personnel. Servicing is require when the
apparatus has been amage in any way, such as power-supply cor or plug is
amage , liqui has been spille or objects have fallen into the apparatus, the
apparatus has been expose to rain or moisture, oes not operate normally, or has
been roppe .
S3125A
S3125A

3
A-60/120
PUBLIC ADDRESS AMPLIFIER
Features
Features
- HIGH POWER, LOW DISTORTION
60W (A-60) or 120W (A-120) of RMS power, with less than 1% THD.
- VERSATILE AND EASY TO USE
Three Mic inputs, two Aux Inputs.
- PRIORITY MUTING
Mic1 input mutes other inputs when in use.
- FLEXIBLE DESIGN
Mono 4Ω or 70V/100V High-Impe ance Outputs.
- TONE CONTROL
Separate Bass an Treble controls to tailor your soun .
Accessories
One etachable AC power cor is provi e for use with this pro uct.
Operation
Operation
Make certain that speakers an input sources are properly connecte before switching on.
Keep volume levels turne own before switching on.
NOTE: The system’s operation is elaye by approximately three secon s after pressing the power switch. This is
ue to the built-in protection circuitry, esigne to protect speakers an other system components.

A-60/120
PUBLIC ADDRESS AMPLIFIER
Front Panel
Front Panel
1. BASS AND TREBLE CONTROLS
These knobs provi e continuous control of the high an low frequency response, by a ing up to 12 B of cut
( ecrease) or boost (increase).
2. PROTECTION INDICATOR
This LED in icates the state of the amplifier’s protection circuitry. When the Protection LED is on (illuminate ),
the protection circuitry is active, in icating that the unit is not operating normally. This is typically ue to
overheating or power limiting. Please check the Input an Output con ition of the amplifier.
3. OUTPUT LEVEL DISPLAY
This six-segment LED meter in icates the amplifier’s output level in RMS.
. MIC VOLUMES 1-3
These knobs provi e continuous control of the volume of Mic Inputs 1-3.
5. AUX VOLUME 1-2
These knobs provi e continuous control of the volume of Aux Inputs 1 an 2.
6. MASTER VOLUME
This knob provi es continuous control of the overall volume of the A-60/120 output.
7. POWER SWITCH
Pressing this switch turns the unit on, as in icate by the Power LED above the switch. Pressing it again turns
the unit off.
PUBLIC ADDRESS AMPLIFIER
A-60
PROT
-14
MIN MAX
MASTER
MIN MAX
MIC 2 POWER
MIN MAX
MIC 1
MIN MAX
MIC 3
-12dB +12dB
TREBLE
MIN MAX
AUX 1
MIN MAX
AUX 2
-12dB +12dB
BASS
-10
-7
-3
0
+3
ON OFF
7
6
13
2
5
4

5
A-60/120
PUBLIC ADDRESS AMPLIFIER
Rear Panel
Rear Panel
1. AC POWER
Connect this cable to your AC outlet.
2. AUX INPUTS 1-2
These inputs are use for connecting line-level sources, such as CD, tuner or cassette eck.
3. SPEAKER OUTPUT TERMINALS
These terminals are use to connect speakers to the unit. You may select either 4Ω conventional operation, or
High Impe ance operation at either 70V or 100V.
. MIC 1,2,3 INPUTS
These 1/4” phone jacks accept a stan ar mic-level input. Input impe ance is 600W, an input sensitivity is
0.6mV.
5. PRIORITY MUTE LEVEL
When Mic Input 1 is active, it mutes all other input signals (priority muting). When priority muting is in effect,
this control is use to set the amount of attenuation (how much muting) is applie to the other inputs when a
signal is present on Mic Input 1. The amount of attenuation can range from very little to complete muting.
PUSH PUSH PUSH
12
345
AUX 1AUX 2
L
R
L
R
MIC 2MIC 3 MIC 1
MIC 1 MUTE
MIN MAX
WARNING;
~AC INPUT
230V 50Hz , 75 W
MODEL NO. A-60
PUBLIC ADDRESS AMPLIFIER
TO REDUCE THE RISK OF ELECTRIC SHOCK ,
DO N OT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
C
70V( 83 )
100V (1 65 )
OM AVIS;RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR.
CAUTION;TO REDUCE THE RISK OF ELECTRIC SHOCK ,
DO N OT REMOVE COVER . NO USER SERVICEABLEPARTS INSIDE.
OC03OC03
0210
SN
www.inter-m.com
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
MADE IN KOREA
4

6A-60/120
PUBLIC ADDRESS AMPLIFIER
Connecting Speakers
Connecting Speakers
Before connecting speakers to your A-60/120 unit, be sure to isconnect the AC power cable. Make certain that
the total impe ance is not less than the rate impe ance in icate .
For 4Ω low-impe ance speakers, connect in parallel, with the positive (+) connectors to the 4Ω terminal an the
negative (-) connectors to the COM terminal. See Figure below.
For high-voltage istribute systems, connect with matching transformer to either 70V or 100V terminals, as per
Figures below. Be certain that the total impe ance oes not equal less than the rate impe ance.
FOR 4Ω TERMINAL
FOR 70V TAP TERMINAL FOR 100V TAP TERMINAL

7
A-60/120
PUBLIC ADDRESS AMPLIFIER
Applications
Applications
PUSH PUSH PUSH
AUX 1AUX 2
L
R
L
R
MIC 2MIC 3 MIC 1
MIC 1 MUTE
MIN MAX
WARNING;
~
AC INPUT
230V 50Hz,75W
MODEL NO. A-60
PUBLIC ADDRESS AMPLIFIER
TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
C
70V( 83 ) 
100V (1 65 ) 
OM AVIS;
RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR.
CAUTION;
TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER.NO USER SERVICEABLE PARTS INSIDE.
OC03OC03
0210
SN
www.inter-m.com
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
MADE IN KOREA
4
CASSETTE DECK
CD PLAYER
SPEAKERS
MIC
MIC
MIC

8A-60/120
PUBLIC ADDRESS AMPLIFIER
Block Diagram
Block Diagram

9
A-60/120
PUBLIC ADDRESS AMPLIFIER
Specifications
Specifications ..............................................................0 B=0.775Vrms
- ELECTRICAL
Rate Output/Impe ance.........................................................A-60: 15.5V/4Ω, 70V/81.6Ω, 100V/166.7Ω
..............................................................................................A-120: 21.9V/4Ω, 70V/40.8Ω, 100V/83.3Ω
Frequency Response (±3 B).......................................................................................................80Hz~16kHz
T.H.D........................................................................................................................................Less than 1%
S/N
Mic ..................................................................................................................................Better than 50 B
Aux..................................................................................................................................Better than 75 B
Input Sensitivity/Impe ance
Mic Input 1-3 ................................................................................................................. -60 B/600Ω, Bal
Aux 1 Input................................................................................................................ -10 B/10kΩ, Unbal
Aux 2 Input ................................................................................................................. +3 B/10kΩ, Unbal
Tone Control
Treble (10kHz) ................................................................................................................................±12 B
Bass (100Hz) ..................................................................................................................................±12 B
- GENERAL
Power Source ................................................................................100–120VAC or 220–240VAC; 50/60Hz
..............................................................(Supplie AC mains transformer epen s on country requirements)
Power Consumption.....................................................................................................................A-60: 75W
..............................................................................................................................................A-120: 105W
Weight ..........................................................................................................................A-60: 8.9kg/19.6lb
.................................................................................................................................A-120: 10.3kg/22.7lb
Dimensions..........................................................420(W) x 88(H) x 320(D)mm/16.5(W) x 3.5(H) x 12.6(D)in
* Specifications an esign subject to change without notice.

10 A-60/120
PUBLIC ADDRESS AMPLIFIER
Service
Service
Procedures
Ensure the problem is not relate to operator error, or system evices that are external to this unit. Information
provi e in the troubleshooting portion of this manual may help with this process. Once it is certain that the
problem is relate to the pro uct contact your warranty provi er as escribe in the warranty section of this
manual.
Schematic
A Schematic is available by contacting your warranty provi er.
Parts List
A Parts List is available by contacting your warranty provi er.
Variations and Options
Variations and Options
Variations
Pro ucts supplie through legitimate sources are compatible with local AC power requirements.
Options
No optional items are available for this pro uct.
Warranty
Warranty
Warranty terms an con itions vary by country an may not be the same for all pro ucts. Terms an con itions
of warranty for a given pro uct may be etermine first by locating the appropriate country which the pro uct
was purchase in, then by locating the pro uct type.
To obtain specific warranty information an available service locations contact Inter-M irectly(in Korea or the
USA) or the authorize Inter-M Distributor for your specific country or region.

NOTE

NOTE

MADE IN KO EA
December 2005 9007103811 A
Inter-M, Lt . (Korea) began operations in 1983.
Since then, Inter-M has grown to become one of the largest manufacturers
of professional au io an commercial soun electronics equipment in the worl .
Inter-M has gaine worl wi e recognition for its own bran e pro ucts,
as well as private label manufacturing of electronics sol un er 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 an offices in Korea an China,
an sales an marketing operations locate in Japan, Europe, an the U.S.A.
With more than 850 employees aroun the globe,
Inter-M is well-poise for further growth an 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 : [email protected]
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 : [email protected]