Toa AC-120 Instruction Manual

ELECTRONIC CONTROLLER

AC-120

Instruction Manual

TOA Corporation

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Contents

User precautions

General description

Features

Panel facilities

Connection

Block diagram

Specifications

Appearance

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3

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User Precautions

The AC-120 cannot be used for the following outdoor speaker (splash-proof) models of
the F-500 and F-600 series : F-500WP, F-500WP-L, F-600WP, and F-600WP-L.
To avoid severe electrical shocks, never open the unit nor touch its internal parts nor
insert hair pins, etc. into the unit.
Water in the unit can be extremely destructive and dangerous. If water does get into the
unit, make no further attempt to use the unit. Instead, switch the power OFF at once,
unplug the power cord from a wall outlet, and then inform your nearest TOA dealer.
To clean the unit's exterior, wipe with a soft damp cloth lightly soaked in water or a
neutral detergent. Never use thinner, benzine, or other solvents, which may discolor the
unit's surface.

General Description

The TOA AC-120 is an electronic controller designed for use with the F-120C ceiling
speaker. It can be used to enhance sound quality of the F-500 and F-600 series speaker
systems.

Features

1. Mountable in an EIA standard 19" rack. (1-unit size)

2. Electronically-balanced I/O jacks. (Pin No.3 : HOT / No.2 : COLD / No.1 : GND)

3. Output for subwoofers.

4. A switch to cut low frequencies for the F-120C speaker.

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Panel Facilities

Front Panel

Rear Panel

Low Cut Indicator (IN)

Lights when the low cut switch is pressed.

Power Indicator

Lights when the power is switched on.

Low Cut Switch (LOW CUT)

Pressing this switch when the equalizer selection switch is set to "F-120C" position cuts

low frequencies.

Power Switch (POWER)

Press this switch

to turn power on. To turn power off, press this switch

again.

Ground Terminal

Be sure to ground the unit.
When other components are connected, a ground loop can be created, generating
hum. In such cases, remove a shorting piece.

Normally, use the unit with the shorting piece attached.

Equalizer Selection Switch (EQ)

Set this switch to "F-120C" position if the F-120C speaker is connected, and to

"F-500/600 SERIES" position if the F-500 or F-600 speaker is connected.

Low Frequency Output Jack (LOW OUT)

This electronically-balanced jack connects to a subwoofer.

Cut-off frequency is 100Hz ( C u t - o f f fr equency slope —12dB/Oct).

Output Jack (OUTPUT)

This electronically-balanced jack connects to a power amplifier.

Input Jack (INPUT)

This electronically-balanced jack is an input for external equipment.

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