A-724
OPERATING INSTRUCTIONS
700 SERIES AMPLIFIERS
A-706, A-712, A-724
Thank you for purchasing TOA's 700 Series Amplifiers.
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.
1. IMPORTANT SAFETY INSTRUCTIONS ........................................................................................ 2
2. SAFETY PRECAUTIONS ............................................................................................................... 2
3. GENERAL DESCRIPTION ............................................................................................................. 4
4. FEATURES ..................................................................................................................................... 4
5. NOMENCLATURE AND FUNCTIONS
Front ................................................................................................................................................ 4
Rear ................................................................................................................................................ 5
6. CONNECTIONS
6.1. Speaker Connections ............................................................................................................... 6
6.2. Remote Volume Control Connection ........................................................................................ 6
6.3. Remote Power ON/OFF Control Connection ........................................................................... 7
6.4. Mute Control Connection ......................................................................................................... 7
6.5. External Equipment Connection to the PRE AMP OUT and PWR AMP IN Terminals ............ 7
7. INSTALLATION .............................................................................................................................. 7
8. RACK MOUNTING ......................................................................................................................... 8
9. CONTROL SETTINGS ................................................................................................................... 8
10. DIMENSIONAL DIAGRAM ............................................................................................................. 8
11. BLOCK DIAGRAM ......................................................................................................................... 9
12. SPECIFICATIONS ........................................................................................................................ 10
Accessories ................................................................................................................................... 10
Optional products .......................................................................................................................... 10
TABLE OF CONTENTS
2
1. IMPORTANT SAFETY INSTRUCTIONS
• Read these instructions.
• Keep these instructions.
• Heed all warnings.
• Follow all instructions.
• Do not use this apparatus near water.
• Clean only with dry cloth.
• Do not block any ventilation openings. Install in accordance with the manufacture's instructions.
• Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.
• 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.
• Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and
the point where they exit from the apparatus.
• Only use attachments/accessories specified by the manufacturer.
• Use only with the bracket specified by the manufacturer, or sold with the apparatus.
• Unplug this apparatus during lightning storms or when unused for long periods of time.
• 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.
• Before installation or use, be sure to carefully read all the instructions in this section for correct and safe
operation.
• Be sure to follow all the precautionary instructions in this section, which contain important warnings and/or
cautions regarding safety.
• After reading, keep this 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 first and
understand the safety symbols and messages so you are thoroughly aware of the potential safety hazards.
When Installing the Unit
• The unit shall not be exposed to dripping or
splashing. To reduce the risk of fire or electric
shock, do not expose this unit to rain or moisture.
• Use the unit only with the voltage specified on the
unit. Using a voltage higher than that which is
specified may result in fire 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 fire or
electric shock.
• Avoid installing or mounting the unit in unstable
locations, such as on a rickety table or a slanted
2. SAFETY PRECAUTIONS
The lightning flash with arrowhead
symbol, within an equilateral triangle, 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.
The exclamation point within an
equilateral triangle is intended to alert
the user to the presence of important
operating and maintenance (servicing)
instructions in the literature
accompanying the appliance.
Indicates a potentially hazardous situation which,
if mishandled, could result in death or serious
personal injury.
WARNING
3
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 off the power, disconnect
the power supply plug from the AC outlet and
contact your nearest TOA dealer. Make no further
attempt to operate the unit in this condition as this
may cause fire 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.)
• To prevent a fire or electric shock, never open nor
remove the unit case as there are high voltage
components inside the unit. Refer all servicing to
your nearest TOA dealer.
• No objects filled with liquids, such as vases, shall
be placed on the unit. If they accidentally spill into
the unit, this may cause a fire or electric shock.
• Do not insert nor drop metallic objects or
flammable materials in the ventilation slots of the
unit's cover, as this may result in fire or electric
shock.
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 fire 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 fire or
electric shock. When removing the power cord, be
sure to hold its plug to pull.
• 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 fire or
electric shock.
When the Unit is in Use
• 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 off 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 fire.
• Contact your TOA dealer as to the cleaning. If dust
is allowed to accumulate in the unit over a long
period of time, a fire or damage to the unit may
result.
• If dust accumulates on the power supply plug or in
the wall AC outlet, a fire may result. Clean it
periodically. In addition, insert the plug in the wall
outlet securely.
• Switch off 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 fire or electric
shock.
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.
ATTENTION
L'appareil ne doit pas être exposé aux éclaboussures ou écoulements et tous objets remplis de liquide, tels
que vases, ne doivent pas être sur l’appareil.
Indicates a potentially hazardous situation which,
if mishandled, could result in moderate or minor
personal injury, and/or property damage.
CAUTION
4
1 23 4 5
6 7 8
5. NOMENCLATURE AND FUNCTIONS
[Front]
1. Power switch [POWER]
Press to turn ON the power.
Press again to turn the power OFF.
2. Power indicator
Lights green when the power is switched on.
3. Input 1 – 8 volume controls [INPUT 1 – 8]
Adjust the corresponding input signal levels. Turn
each control clockwise to increase and
counterclockwise to decrease the level.
4. Master volume control [MASTER]
Adjusts the overall signal level. Turn the control
clockwise to increase and counterclockwise to
decrease the level.
5. LED level meter
Indicates an output level.
6. Bass control [BASS]
Adjusts bass response. Turn clockwise to increase
bass output, and counterclockwise to decrease it.
The center position provides flat characteristics.
7. Treble control [TREBLE]
Adjusts treble response. Turn clockwise to
increase treble output, and counterclockwise to
decrease it. The center position provides flat
characteristics.
8. Module input volume control [MODULE]
Adjusts the signal level of the module input on the
rear panel. Turn the control clockwise to increase
and counterclockwise to decrease the level.
3. GENERAL DESCRIPTION
Equipped with 6 LINE/MIC selectable inputs, 2 LINE inputs and 1 MODULE input, the A-706, A-712, and A-
724 PA amplifiers are designed to suit PA system applications such as announcements, BGM and
broadcasting in churches, large rooms and factories.
4. FEATURES
• Power output of 60 W (A-706), 120 W (A-712), and 240 W (A-724).
• Mute Receive function assignable to all inputs, and Mute Send function assignable to Inputs 1 – 3 and Mute
input.
• An equalizer or other signal processor connectable between PWR AMP IN and PRE AMP OUT terminals to
make fine adjustment of sound.
• Tone controls (bass and treble).
• Output level meter.
• Master volume control for adjusting overall input signal level.
• Microphone gain trims for adjusting MIC level on Inputs 1 – 6.
This figure represents the A-724.
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