6.1. Removable Terminal Plug Connection P9
6.2. Input Connections
6.3. Speaker Connections
6.5. AC Power Connections
6.4. Remote Volume Connection
9.1. Input Sensitivity Selection
9.2. Output Volume Setting
Thank you for purchasing TOA's Power Amplifier.
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.
• Read these instructions.
• Keep these instructions.
• Heed all warnings.
• Follow all instructions.
• Do not use this apparatus near water.
• Clean only with dry cloth.
• Install in accordance with the manufacturer'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 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
• 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.
• Lire ces instructions.
• Conserver ces instructions.
• Respecter toutes les instructions.
• Suiver toutes les instructions.
• Ne pas utiliser cet appareil près de l'eau.
• Nettoyer avec un chiffon sec.
• Ne pas bloquer les ouvertures de ventilation. Installer conformément aux instructions
du fabricant.
• Ne pas installer près de sources de chaleur telles que radiateurs, registres de chaleur,
poêles ou autres appareils (y compris les amplificateurs) produisant de la chaleur.
• Ne forcez jamais la sécurité des prises bipolaires ou des prises de terre. Une fiche
polarisée possède deux lames dont l’une est plus large que l'autre. Une prise de terre
possède deux lames et une broche de terre. La lame large ou la troisième broche est
fournie pour votre sécurité. Si la fiche fournie ne rentre pas dans votre prise, consultez
un électricien pour faire remplacer la prise obsolète.
• Empéchez le cordon d'alimentation d'être piétiné ou pincé, particulièrement au niveau
des prises électriques, et le point d'où ils sortent de l'appareil.
• N'utilisez que des accessoires spécifiés par le fabricant.
• Utilisez uniquement le chariot, un trépied, une console ou table spécifiés par le
fabricant ou vendus avec l'appareil. Quand un chariot est utilisé, dèplacer trés prudemment
l'ensemble chariot / appareil pour éviter les et les renversements.
• Débranchez cet appareil pendant les orages ou lorsqu'il n'est pas utilisé pendant de
longues périodes de temps.
• Confier les travaux d'entretien à un personnel qualifié. Un entretien est requis lorsque
l'appareil a été endommagé de quelque façons, par exemple le cordon d'alimentation ou
la prise est endommagé, du a été renversé ou des objets sont tombés dans l'appareil.
L'appareil a été exposé à la pluie ou à l'humidité, il fonctionne pas normalement, ou s'il
est tombé.
• Before installation or use, be sure to carefully read all the instructions in this section for correct and safe
• 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.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of
important operation and maintenance (servicing) instruction in the literature accompanying the
Indicates a potentially hazardous situation which, if mishandled, could
result in death or serious personal injury.
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 fire or electric shock.
• 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 surface.
Doing so may result in the unit falling down and causing personal injury and/or property damage.
• The apparatus shall be connected to a mains socket outlet with a protective earthing connection.
• The socket-outlet shall be installed near the equipment and the plug (disconnecting device) shall be easily
• External wiring connected to the terminals marked with
requires installation by an instructed person.
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.
• 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 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.
CAUTION Indicates a potentially hazardous situation which, if mishandled, could
result in moderate or minor personal injury, and/or property damage.
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
• To avoid electric shocks, be sure to unplug the unit's power supply cord when connecting speakers.
• Be sure to follow the instructions below when rack-mounting the unit. Failure to do so may cause a fire or
personal injury.
· Install the equipment rack on a stable, hard floor. Fix it with anchor bolts or take other arrangements to
prevent it from falling down.
· When connecting the unit's power cord to an AC outlet, use the AC outlet with current capacity allowable to
the unit.
· No rack-mounting screws are supplied with the unit. Separately prepare the appropriate screws for the rack.
• Keep the amplifier over 10 cm (3.94") away from
objects that may obstruct air flow to prevent the unit's
internal temperature rise.
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.
• 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. internal temperature rise.
• 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.
The lighting 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.
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.
The AV-60S-AM is a single channel digital amplifier for speech and general announcement. This compact
amplifier is equipped switching power supply circuit inside, Energy Star 3.0 certified and PLENUM rated (UL
2043 tested) for the installation into air handling space without external AC adaptor. The rated output power is
60W at 70V or 4 Ohms. The unit is suited to use in board room, conference room and AV presentation room.
70V / 4 Ohms output is selectable with a selector switch.
3 kinds of input connector (RTB, 3.5mm plug and RCA STEREO) with individual input level selector switch.
Compliant with “Energy Star 3.0” to save the power automatically moving into minimum power consumption.
High efficiency and low heat Class-D amplifier technology achieves fanless, no ventilation, convection cooling.
Supplied VCA for remote volume control.
Front operable bass and treble controls in recessed design to prevent accidental operation.
• Removable input/output terminal blocks facilitate installation and maintenance.
• Built-in ALC (Auto-Level Compressor) circuit to protect the connected speakers and internal
components from the over loaded input.
• Working in AC100V to 240V, 50Hz/60Hz.
• UL2043, plenum rated construction for in-the-ceiling installation using attached EMT adaptor plate.
1. Power on indicator
Lights green is always on when the amplifier is
powered on. If the unit stays power saving mode,
power led slowly blinking.
2. Protection indicator
Whenever this red indicator lights up, it implies that
the internal protections have been triggered to protect
the unit against damage. Should this protections turn
on, please check if the amplifier is being overdriven or
there is any short circuit in speaker wires.
This figure represents the AV-60S-AM
3. Signal level indicators
Lights green when audio signals are output from the
speaker output terminals.
4. Peak indicators
Lights red if output signals approach clipping level. If
steady lit, turn down the corresponding input volume
control until the indicator flashes intermittently
5. Master volume control
Adjusts gain of the mixed inputs.
Turn the knob clockwise to increase the level and
counterclockwise to decrease it.
6. Bass control
Turn the knob clockwise to increase bass level and
counterclockwise to decrease it. The center
position of the control provides flat frequency
7. Treble control
Turn the knob clockwise to increase treble level
and counterclockwise to decrease it.
The center position of the control provides flat
frequency response.
⑫ ⑭
This figure represents the AV-60S-AM
8. Breaker
Cuts off the AC power supply from the AC outlet if
the power current exceeds the allowable value.
Note: The red button in the breaker pops out to
indicate that the breaker has tripped. After turning
off the power and eliminating the cause of the
breaker trip, press the button to reset the breaker.
9. AC receptacle
Connect AC cord from this inlet to AC wall outlet.
P.S.: This IEC power receptacle can be removed
and replaced with Flexible Conduit Adapter using
EMT adaptor plate attached to the unit. For
UL2043 certification, the optional receptacle which
can be directly connects AC wires with the screw
terminals on the PCB is required.
10. Speaker output terminal
Connects to speakers.
Removable terminal block (2P).
Line 1 input terminals
10K Ohms, electronically-balanced (transformer
isolated), removable terminal block. Connect a
microphone or sound source equipment.
12. Input level select switches
Use these switches to adjust input gain of Line1,
Line 2 and Line 3, respectively. (*0dB=1V)
13. Line 2 input terminal
10K Ohms, unbalanced, 3.5mm mini Phone Jack.
Connect a sound source equipment such as a CD
14. Line 3 input terminals
10K Ohms, unbalanced, RCA jack. Connect a
sound source equipment such as a CD player.
15. Remote volume control
10K Ohms, removable terminal block (2P). Use it
as a remote volume control.
16. Output selector switch
Move the switch downwards to set 70V output;
move upwards to set 4 Ohms output.
6.1. Removable Terminal Plug Connection
• Avoid soldering cable conductor, as contact resistance may increase when the cable is tightened and the
solder is crushed, possibly resulting in an excessive rise in joint temperatures.
• Use cables of AWG 12 – 24.
[Cable end treatment]
2-core shielded cable
7 mm
Solid cable and stranded cable
7 mm
20 mm
[Wiring Procedure]
Step 1. Wiring the supplied removable terminal plug.
1-1. Loosen the terminal screws to insert the wire.
1-2. Tighten the terminal screws.
Ensure that the wire does not break free when pulled. If
the wire does pull free, repeat the connection procedure
from the start.
Step 2. Insert the wired terminal plug into the corresponding
terminal block in the unit's rear panel.
Step 3. Tighten the fixing screws. (Speaker output terminals only)
• Do not reverse Steps 1 and 2. Poor contact may result if force is
applied to the unit's internal circuit board pins while the terminal
screws are being tightened.
• Use an appropriate type screwdriver for terminal plug wiring.
6.2. Input Connections
6.2.1. Line 1 input connections
6.3. Speaker Connections
Class 2 wiring may be used.
6.4. Remote Volume Connection
When a remove volume control is needed, wiring a 10K Ohms potentiometer to the 2-pin Remote Volume
Control Jack as shown below. Attenuating the value of the potentiometer will reduce the audio level. This
attenuation works for the audio signal after adjusted by its master volume control.
6.5. AC Power Connections
If necessary, this power receptacle can be replaced with flexible conduit adapter. For UL2043 certification, the
optional receptacle which can be directly connected AC wires with the screw terminals on the PCB is required.
For plenum space installation details, please refer to Appendix.
After completing all audio and control connections, connect the power supply, and check the power indicator.
When the heat sink temperature exceeds 130°C (266 °F), the protection circuit begins to operate to disconnect
the output from the circuit. The disconnected output is automatically restored as soon as the temperature
returns to the normal operating range.
Keep the amplifier over 10 cm (3.94") away from
objects that may obstruct air flow to prevent the
unit's internal temperature rise.
9.1. Input Sensitivity Selection
Output level is adjustable with individual -10dBV/-20dBV switch. For those audio source equipments which
always have relative high output level, such as CD players, please set the input sensitivity selection switch to
-10dBV position; otherwise, set to -20dBV position.
9.2. Output Volume Setting
Output level is adjustable with master volume control. For music play or announcement, adjust the proper
volume control or sensitivity so that the signal indicator lights intermittently. Note that the sound quality is
downgraded when the peak indicator remains lit.
When a Remove Volume Control is connected, attenuating the value of the potentiometer will reduce the
volume level. This attenuation works for the audio signal after adjusted by its master volume control.
Model No.
Power Source
100V to 240V AC, 50Hz/60Hz
Rated Output
60W @ 4 Ohms, 60W @ 70V
Rated Output
Power Consumption Idle
Less than 85W @ 70V, Less than 110W @ 4 Ohms
Less than 10W @ 70V, Less than 7W @ 4 Ohms
Power Save Mode
Less than 1W
4 Ohms mode: 20Hz to 20KHz ±3dB
Frequency Response
70V mode: 60Hz to 20KHz ±3dB
(Line1 input with transformer: 100Hz to 20KHz)
Total Harmonic Distortion (THD+N)
Less than 0.15%
Line 1:
-10/-20dB* (selectable), 10K Ohms, transformer-balanced,
removable terminal block
Line 2:
-10/-20dB* (selectable), 10K Ohms, unbalanced, 3.5mm stereo jack
Line 3:
-10/-20dB* (selectable), 10K Ohms, unbalanced, RCA jacks
Speaker output, removable terminal block (2P)
Tone Control
Bass: ±10dB at 100Hz, Treble: ±10dB at 10KHz
Master volume control
Remote volume control
Bass tone control, Treble tone control
70V / 4 Ohm switch
Input sensitivity switches (Line 1, Line 2, Line 3)
Power LED, Protection LED, Signal LED, Peak LED
Other Feature
Automatic Level Control, Thermal/Over-current protection,
Automatic power save function (EnergyStar rated)
Operating Temperature
-10 to +40°C
Black metal case
150 (w) x 44 (h) x 156 (d) mm (5.90" x 1.73" x 6.14")
1.12 Kg (2.5 Ibs)
* 0 dB = 1 V
Note: The design and specifications are subject to change without notice for improvement.
• Accessories
Removable terminal plug (2P) ................... 2
Removable terminal plug (3P) ................... 2
AC power cord ..................................... 1
........................................ 4
EMT adaptor plate ................................ 1
Rubber foot
13. APPENDIX – Installation Guide for Flexible Conduit Adapter Kit
13.1. Cautions and Warnings.
* Make sure that the AV-60S-AM or the source devices, and all output devices are turned off and disconnected
from the power source before you begin.
* A UL listed electrical distribution box is recommended for the termination of the conduit.
* The UL approved electrical distribution box and flexible conduit are not included; the installer is responsible for
obtaining and installing them.
* The circuit breaker used for this connection should be rated a minimum of 20 Amps.
* Installation and service must be performed by a qualified electrician only.
* This unit must be installed in accordance with the National Electrical Code and with all local codes.
* An all poles mains switch with a contact separation of at least 3mm in each pole must be incorporated in the
electrical installation of the building. The installation must be carried out in accordance with all applicable
installation rules.
* This unit is not to be used beyond its rated voltage range.
* This unit must be wired to a UL listed distribution box.
* If it is used for a branch-circuit wiring or anticipated at a TERMINAL connection, a minimum 14AWG (2.1mm2 )
conductor (2.1mm) should be used. The conductor material should be copper or aluminum.
*A pigtail lead should not be more than two wire sizes smaller than the mains supply conductor to which it will be
13.2. Installation With Flexible Conduit Cable
Install the flexible conduit cable assembly to AV-60S-AM as following procedures:
1. Remove the IEC power cord.
2. Remove and retain the two Philips head screws that secure the AC receptacle to the back panel (Fig.1).
3. Remove and retain the 10 screws that secured the top cover of AV-60S-AM to its main chassis (Fig.2).
4. Carefully lift the top cover up, remove and retain it.
5. Use a standard screwdriver to loosen the screws holding the Hot and Neutral wires on the terminal block
6. Unscrew the AC receptacle ground wire from the ground screw nut on the metal bottom of AV-60S-AM.
7. From the back panel end, pull the AC receptacle out of the enclosure.
8. Thread the 12- or 14-gauge power wires though the length of the electrical conduit tube.
9. Install the EMT adapter plate with the conduit attached (Fig.4) into the opening from which you removed the
AC receptacle. Use the Philips head screws that you removed in step 2 to attach the EMT adapter plate.
10. Slide the conduit nut (Fig.4) over the bundle of the wires exiting the conduit and onto the conduit itself. Hand
tighten the nut.
11. Attach and screw down the Hot and Neutral wires exiting from the conduit to their corresponding screws on
the terminal block. Be sure that the polarity of the AC wires is correct.
12. Secure firmly the ground wire from the conduit to the metal bottom by reattaching the ground wire nut.
13. Ensure that the conduit nut from step 10 (Fig.4) firmly secures the conduit EMT adapter plate.
14. Use the 10 screws you removed in step 3 to secure the top cover of the AV-60S-AM back onto its main
AC Receptacle
Remove two screws
Remove side screws
Terminal block
Ground wire nut
Terminal block
Ground wire nut
EMT adaptor plate
Conduit nut
Hot terminal
Neutral terminal
Hot terminal
Neutral terminal
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