Toa TC-651M - User Manual

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1. 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.

HORN SPEAKER INSTRUCTION MANUAL

Indicates a potentially hazardous situation which, if mishandled, could

result in death or serious personal injury.

Indicates a potentially hazardous situation which, if mishandled, could

result in moderate or minor personal injury, and/or property damage.

WARNING

CAUTION

• Use only the specified amplifier output voltage and

impedance, as exceeding the specified limits could

result in fire or other failures (high-impedance

version).

• To avoid accidental air explosions, do not use the

unit around gasoline, thinner or other combustibles.

• Install the unit only in a location that can

structurally support the weight of the unit and the

mounting bracket. Doing otherwise may result in

the unit falling down and causing personal injury

and/or property damage.

• Protect the unit from exposure in snowy areas, as

the weight of snow build-up could cause the

speaker to fall, resulting in personal injury.

• Do not use other methods than specified to mount

the bracket. Extreme force is applied to the unit

and the unit could fall off, possibly resulting in

personal injuries.

• Attach the safety wire to the unit when mounting in

locations high above the ground. Failure to do so

could result in personal injury if the speaker should

later fall for any reason.

• Use nuts and bolts that are appropriate for the

ceiling's or wall's structure and composition. Failure

to do so may cause the speaker to fall, resulting in

material damage and possible personal injury.

• Tighten each nut and bolt securely. Ensure that the

bracket has no loose joints after installation to

prevent accidents that could result in personal

injury.

• Avoid mounting the unit in locations exposed to

constant vibration. The mounting bracket can be

damaged by excessive vibration, potentially

causing the speaker to fall, which could result in

personal injury.

• To avoid electric shocks, be sure to switch off the

amplifier power when connecting the speaker.

• Avoid installing the unit in humid or dusty locations,

or in locations exposed to heaters, solvents, acid,

alkali, smoke, steam or direct sunlight (except

outdoor-use versions), as excessive exposure to

these factors could result in speaker failure, fire or

electric shock.

• 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.

• Do not stand or sit on, nor hang down from the unit

as this may cause it to fall down or drop, resulting

in personal injury and/or property damage.

• Have the unit periodically checked by the shop

from where it was purchased. Also, when mounting

the unit on a vehicle, be sure to check both the

speaker and its mounts before moving. Failure to

do so could result in the speaker falling off due to

damage or corrosion to the speaker or its mounts,

and possible personal injury.

WARNING

CAUTION

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This document outlines the operational and safety guidelines for a TOA Horn Speaker, detailing its function, usage, and maintenance to ensure safe and effective performance.

Function Description

The TOA Horn Speaker is designed for sound amplification, primarily in environments where robust and directional sound projection is required. It functions by converting electrical audio signals into acoustic energy, directing sound over a specific area. The speaker is available in both low-impedance and high-impedance versions, catering to different amplifier setups and installation requirements. High-impedance versions incorporate a built-in matching transformer, allowing for connection to constant voltage amplifier outputs, which is common in public address systems over long distances. The speaker's design includes a drain hole to prevent water accumulation, particularly important for outdoor installations, ensuring longevity and consistent performance. An impedance selector switch allows users to adjust the speaker's impedance to match the amplifier's output, optimizing sound quality and preventing equipment damage.

Usage Features

The TOA Horn Speaker offers several features to facilitate its use and integration into various sound systems. For installation, it is crucial to position the drain hole facing the ground, especially for models like the SC-610, SC-615, and SC-630 series, to prevent water ingress and potential failure. When multiple speakers are used in the same location, proper polarity must be observed to avoid issues like reduced bass output or decreased volume. Black speaker cables are typically positive (+), while white cables are negative (-) or common (COM). Parallel connections should use cables of the same colors, while series connections should use cables of different colors.

Users must avoid simultaneously connecting both low- and high-impedance speakers to the same amplifier to prevent amplifier failure. For high-impedance speakers, it is imperative to use only the specified line voltage (amplifier output voltage) indicated on the nameplate (e.g., [25/70 V LINE] or [70/100 V LINE]) to prevent fire or equipment damage.

For low-impedance speaker setups involving two or more speakers, all connected units must have identical impedance and input ratings. The total speaker impedance should match the amplifier's output impedance; a lower total impedance could damage the speakers or amplifier. When parallel-connecting low-impedance speakers, the total rated input of all speakers must exceed the amplifier output. For long distances between the amplifier and speaker (30 – 50 m), it is recommended to use solid wire speaker cable with a diameter over 2 mm or strand wire over 3.5 mm² to minimize transmission loss, or to connect an optional matching transformer to convert the speakers to high-impedance operation.

For high-impedance speakers, the total rated input of all connected speakers must be equal to or less than the amplifier output. Connecting all speakers in parallel is the standard method for high-impedance setups.

Impedance selection is a key feature, allowing users to adjust the speaker's impedance to match the amplifier. This is done by inserting a screwdriver into the impedance selector switch slot and turning the switch. An "OFF" position is available to disconnect the speaker from the amplifier, silencing it. Speakers are factory-preset for the highest rated input of two line voltages (e.g., 100 V line for the 70/100 V line version). The speaker's rated input and impedance are clearly indicated on the nameplate. Users should confirm the line voltage to be used and select the corresponding impedance. It is critical not to use the impedance selector switch position marked as "[-]", as this could lead to amplifier or speaker failure, or fire.

The speaker comes in three parts: Bell, Center, and Bracket. Assembly involves attaching these components using four assembly screws provided with the "Center" part.

Maintenance Features

The manual emphasizes several maintenance and safety precautions to ensure the longevity and safe operation of the horn speaker. Before installation or use, users must carefully read all instructions and follow precautionary guidelines, including warnings and cautions. The manual should be kept handy for future reference.

To prevent serious personal injury or property damage, users are warned against using the specified amplifier output voltage and impedance, as exceeding limits could cause fire or other failures. The unit should not be used near gasoline, thinner, or other combustibles to avoid accidental air explosions. Installation must only occur in locations that can structurally support the unit's weight and the mounting bracket; failure to do so could result in the unit falling and causing injury or damage. In snowy areas, the unit must be protected from snow build-up, which could cause the speaker to fall.

Mounting the bracket should only be done using specified methods, as extreme force applied otherwise could cause the unit to fall. When mounting in high locations, a safety wire must be attached to the unit to prevent personal injury if the speaker falls. Nuts and bolts appropriate for the ceiling's or wall's structure and composition must be used, and they must be tightened securely to ensure no loose joints in the bracket after installation.

To avoid electric shocks, the amplifier power must be switched off when connecting the speaker. The unit should not be installed in humid or dusty locations, or areas exposed to heaters, solvents, acid, alkali, smoke, steam, or direct sunlight (unless it's an outdoor-use version), as these conditions can lead to speaker failure, fire, or electric shock. Operating the unit with distorting sound for extended periods is an indication of a malfunction that can generate heat and cause fire.

Users should not stand, sit on, or hang from the unit, as this could cause it to fall, resulting in personal injury or property damage. Periodic checks by the purchasing shop are recommended. When mounting the unit on a vehicle, both the speaker and its mounts should be checked before moving to prevent the speaker from falling off due to damage or corrosion.

The manual also advises on using nuts and bolts appropriate for the ceiling's or wall's structure and composition, and tightening them securely to prevent the speaker from falling. For concrete walls and structures, appropriate bolts and nuts must be used, and they must be tightened securely. The bracket should have no loose joints after installation. The unit should not be mounted in locations exposed to constant vibration, as this can damage the mounting bracket and cause the speaker to fall.

Finally, the manual details the importance of periodical checks by the shop where the unit was purchased. For vehicle-mounted units, both the speaker and its mounts should be checked before moving to prevent accidents due to damage or corrosion.