TOA AV-20D AM Instructions

13.

OPERATING INSTRUCTIONS

POWER AMPLIFIER

AV-20D

TABLE OFCONTENTS

1. IMPORTANT SAFETY INSTRUCTIONS P2

2. SAFETY PRECAUTIONS

3. GENERAL DESCRIPTIONS

4. FEATURES

5. NOMENCLATURE AND FUNCTIONS

Front Rear

6. CONNECTIONS

6.1. Removable Terminal Plug Connection P8

6.2. Input Connections

6.3. Speaker Connections

6.4. Remote Volume Connection

6.5. AC Power Connections

OPERATION P10 P3 P5 P5 P5

INSTALLATION PRECAUTIONS P10

ADJUSTMENT P10

9.1. Input Sensitivity Selection P10

9.2. Output Volume Setting P10 P5 10. BLOCK DIAGRAM P11 P6 11. DIMENTIONAL DIAGRAM P12

P8 12.SPECIFICATIONS P13

APPENDIX P14

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.

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.

• 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

tip-over.

• 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.

2. SAFETY PRECAUTIONS

• 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.

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

appliance.

WARNING

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

accessible.

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

shock.

• 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.

3. GENERAL DESCRIPTION

The AV-20D is a 2 channel digital amplifier for speech and general announcement. This compact amplifier is

equipped switching power supply circuit inside, Energy Star 2.0 certified and PLENUM rated (UL 2043 listed) for

the installation into air handling space without external AC adaptor. The rated output power is 15W at 8 Ohms x

2 channel, 20W at 4 Ohms x 2 channel or 40W at 8 Ohms in BTL connection. The unit is suited to use in board

room, conference room and AV presentation room.

4. FEATURES

• 3 kinds of input connector (RTB, 3.5mm plug and RCA STEREO) with individual input level selector switch.

• Compliant with “Energy Star 2.0” 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-240V, 50Hz/60Hz.

• UL2043, plenum rated construction for in-the-ceiling installation using attached EMT adaptor plate

5. NOMENCLATURE AND FUNCTIONS

[Front]

1. Power on indicator

Lights green when the amplifier is powered on. If it is blinking the unit stays power saving mode.

2. Protection indicator

Whenever this yellow 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-20D

3. Signal level indicators (L&R channels)

Lights green when audio signals are output from the speaker output terminals.

4. Peak indicators (L&R channels)

Lights red if output signals approach clipping level. If steady lit, turn down the corresponding input volume control until the indicator flashes intermittently

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