LINEAR SOUND LTS.A4120L User manual

Linear Technologie • 11 rue du Puits Rochefort • 42 100 Saint-Etienne
Tél: [phone] • Fax: [phone] • www.lineartech.fr V.2017
Follow the manual instructions to obtain the optimum results from this unit.
We also recommend that you keep this manual handy for future reference.
4 CHANNELS AMPLIFIER
LTS.A4120L / LTS.A4240L
Operation manual

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1. Safety precautions
2. General description
3. Features
4. Nomenclature and functions
a. Front and rear panel A4120L
b. Rear and rear panel A4240L
5. Connections
a. Speaker connections
b. Input connections
6. Applications
7. Block diagram
8. Specications
9. Dimensional diagram
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TABLE OF CONTENTS

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• Be sure to read the instructions in this section carefully before use.
• Make sure to observe the instructions in this manual as the conventions of safety symbols
and messages regarded as very important precautions are included.
• We also recommend you keep this instruction manual handy for future reference.
Safety symbol and message conventions
Safety symbols and messages described below are used in this manual to prevent bodily
injury and property damage which could result from mishandling. Before operating your
product, read this manual rst and understand the safety symbols and messages so you are
thoroughly aware of the potential safety.
Warning
When installing the unit
• Do not expose the unit to rain or an environment where it may be splashed by water or
other liquids,as doing so may result in re or electric shock.
• Use the unit only with the voltage specied on the unit. Using a voltage higher than that
which is specied may result in re or electric shock.
• Do not cut, kink, otherwise damage nor modify the power supply cord. In addition,
avoid using the power cord in close proximity to heaters, and never place heavy objects
(including the unit itself) on the power cord, as doing so may result in re or electric
shock.
• Be sure to replace the unit’s terminal cover after connection completion. Because high
voltage is applied to the speaker terminals, never touch these terminals to avoid electric
shock.
• Be sure to ground to the safety ground (earth) terminal to avoid electric shock. Never
ground to a gas pipe as a catastrophic disaster may result.
• Avoid installing or mounting the unit in unstable locations, such as on a rickety table or a
slanted surface. Doing so may result in the unit falling down, causing personal injury and
/ or property damage.
When the unit is in use
• Should the following irregularity be found during use, immediately switch o󰀨 the power,
disconnect the power supply plug from the AC outlet and contact your nearest dealer.
Make no further attempt to operate the unit in this conditions this may cause re or
electric shock, ...
- If you detect smoke or a strange smell coming from the unit.
- If water or any metallic object gets into the unit.
- If the unit falls, or the unit case breaks.
- If the power supply cord is damaged (exposure of the core, disconnection, etc)
- If it is malfunctioning (no tone sounds)
WARNING Indicates a potentially hazardous situation which, if mishandled,
could result in death or serious personal injury.
CAUTION
Indicates a potentially hazardous situation which, if mishandled,
could result in moderate or minor personal injury, and/or property
damage.
1. SAFETY PRECAUTIONS

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• To prevent a re or electric shock, never open or remove the unit case as there are high
voltage components inside the unit. Refer all servicing to your nearest dealer.
• Do not place cups, bowls, or other containers of liquid or metallic objects on top of the
unit. If they accidentally spill into the unit, this may cause a re or electric shock.
• Do not insert nor drop metallic objects or ammable materials in the ventilation slots of
the unit’s cover, as this may result in re or electric shock.
Caution
When installing the unit
• Never plug in nor remove the power supply plug with wet hands, as doing so may cause
electric shock.
• When unplugging the power supply cord, be sure to grasp the power supply plug; never
pull on the cord itself. Operating the unit with a damaged power supply cord may cause
a re or electric shock.
• When moving the unit, be sure to remove its power supply cord from the wall outlet.
Moving the unit with the power cord connected to the outlet may cause damage to the
power cord, resulting in re or electric shock. When removing the power cord, be sure to
hold its plug to pull.
• Do not block the ventilation slots in the unit’s cover. Doing so may cause heat to build up
inside the unit and result in re.
• Avoid installing the unit in humid or dusty locations, in locations exposed to the direct
sunlight, near the heaters, or in locations generating sooty smoke or steam as doing
otherwise may result in re or electric shock.
When the unit is in use
• Should the following irregularity be found during use, immediately switch o󰀨 the power,
disconnect the power supply plug from the AC outlet and contact your nearest dealer.
Make no further attempt to operate the unit in this conditions this may cause re or
electric shock, ...
• To prevent a re or electric shock, never open or remove the unit case as there are high
voltage components inside the unit. Refer all servicing to your nearest dealer.
• Do not place cups, bowls, or other containers of liquid or metallic objects on top of the
unit. If they accidentally spill into the unit, this may cause a re or electric shock.
• Do not insert nor drop metallic objects or ammable materials in the ventilation slots of
the unit’s cover, as this may result in re or electric shock.
• Do not place heavy objects on the unit as this may cause it to fall or break which may
result in personal injury and/or property damage. In addition, the object itself may fall o󰀨
and cause injury and / or damage.
• Make sure that the volume control is set to minimum position before power is switched
on. Loud noise produced at high volume when power is switched on can impair hearing.
• Do not operate the unit for an extended period of time with the sound distorting. This is
an indication of a malfunction, which in turn can cause heat to generate and result in a
re.
• Contact your dealer as to the cleaning. If dust is allowed to accumulate in the unit over a
long period of time, a re or damage to the unit may result.
• If dust accumulates on the power supply plug or in the wall AC outlet, a re may result.
Clean it periodically. In addition, insert the plug in the wall outlet securely.
• Switch o󰀨 the power, and unplug the power supply plug from the AC outlet for safety
purposes when cleaning or leaving the unit unused for 10 days or more. Doing otherwise
may cause a re or electric shock.

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1. POWER SWITCH : On top of the opening power. Press the end, power shut down
2. CH1\CH2\CH3\CH4 VOLUME : Channel volume control(CH1/CH2/CH3/CH4)
3. PEAK : Peaking indicator LED
4. SIGNAL : Signal indicator LED. When lit input signal is detected.
5. PROTECT : Protection indicator LED. When lit amplier is in protection mode. Turn o󰀨
amplier, and check for short circuit in speaker wiring or excessive speaker load.
6. POWER : Power indicator LED
7. STARTUP : Startup indicator LED
2. GENERAL DESCRIPTION
Note : An all-pole mains switch with a contact separation of at least 3 mm in each pole shall
be incorporated in the electrical installation of the building.
With four separate power ampliers in a single chassis and power ratings from 120 to 240
watts RMS, these sleek, attractive units provide a compact solution for PA system amplication
and distribution. Each channel has its own input and 4-16 ohm, 70V and 100V speaker
outputs, so a wide variety of audio sources and speaker zones can be easily congured.
3. FEATURES
• Rated outputs : 120W and 240W.
• 100V/70V line transformer-isolated speaker outputs, low impedance 4-16 ohms speaker
outputs.
• Four independent amps in a signal chassis.
• Four line level inputs.
• Commercial-grade torroidal transformers produce high performance audio on a wide
range o󰀨 frequencies.
• Intelligent limiter can reduce excess signal.
• Reliable protection against overload, short circuit and power uctuation for optimum
reliability.
• Heat sinks and fan protect against overheating, protecting the ampliers working life.
• Rubber feet and rack mount ears-may be placed on tables or installed in rack mount
cabinets.
4. NOMENCLATURE AND FUNCTIONS
a. Front and rear panel A4120L

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8. COMMON SPEAKER OUTPUT 4 : Connectors for 4~16 ohms or 70V and 100V speaker
9. COMMON SPEAKER OUTPUT 3 : Connectors for 4~16 ohms or 70V and 100V speaker
10. COMMON SPEAKER OUTPUT 2 : Connectors for 4~16 ohms or 70V and 100V speaker
11. COMMON SPEAKER OUTPUT 1 : Connectors for 4~16 ohms or 70V and 100V speaker
12. ~230V/50Hz POWER INPUT
13. AC FUSE : Use type T7AL250V/T8AL250V
14. LINE LEVEL INPUTS(RCA)
1. POWER SWITCH : On top of the opening Power. Press the end, power shut down
2. CH1\CH2\CH3\CH4 VOLUME : Channel volume control (CH1/CH2/CH3/CH4)
3. PEAK : Peaking indicator LED
4. SIGNAL : Signal indicator LED. When lit input signal is detected.
5. PROTECT : Protection indicator LED. When lit amplier is in protection mode. Turn o󰀨
amplier, and check for short circuit in speaker wiring or excessive speaker load.
6. POWER : Power indicator LED
7. STARTUP : Startup indicator LED
b. Front and rear panel A4240L

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a. Speaker connections
Note : Both the 4 - 16 ohms and 70V / 100V terminals cannot be used at the same time.
Impedances indicated in the gures represent the total speaker system (load) impedances.
WARNING
An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be
incorporated in the electrical installation of the building.
b. Input connections
All inputs should be connected with rear panel
socket, please see :
8. COMMON SPEAKER OUTPUT 4 : Connectors for 4~16 ohms or 70V and 100V speaker
9. COMMON SPEAKER OUTPUT 3 : Connectors for 4~16 ohms or 70V and 100V speaker
10. COMMON SPEAKER OUTPUT 2 : Connectors for 4~16 ohms or 70V and 100V speaker
11. COMMON SPEAKER OUTPUT 1 : Connectors for 4~16 ohms or 70V and 100V speaker
12. ~230V/50Hz POWER INPUT
13. AC FUSE : Use type T7AL250V/T8AL250V
14. LINE LEVEL INPUTS(RCA)
5. CONNECTIONS

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Rear panel connection
6. APPLICATIONS
A4120L A4240L

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Model A4120L A4240L
Rated power output 4 x 120W 4 x 240W
Speaker outputs 4 - 16 ohms, 70V/100V
Outputs noise <3mV
Impedance 200:1
Input sensitivity 775mV/0dB
Frequency response 50Hz~16KHz distortion<1.5Db
S/N ratio >15V/microsecond
T.H.D <1%
Cooling method Compulsive wind cool form
Indicators Power, signal, protection, peaking
Protection Power on, overload and protection
Power requirements ~230V / 50 Hz
Power consumption 700W 1500W
Dimensions (mm) 484 x 490 x 88 484 x 490 x 132
Weight 26 kg 29 kg
7. BLOCK DIAGRAM
8. SPECIFICATIONS

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A4120 L
Keep the unit’s all sides over 10 cm away from
objects that may obstruct air ow to prevent
the unit’s internal temperature rise.
A4240 L
9. DIMENSIONAL DIAGRAM

Linear Technologie • 11 rue du Puits Rochefort • 42 100 Saint-Etienne
Tél: [phone] • Fax: [phone] • www.lineartech.fr