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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Connection
No subwoofer is used.
Mixer/
Preamplifier
Ch.1
Ch.2
Electronic
Controller
AC-120
Ch.1
Ch.2
Power Amplifier
Speaker
Speaker
A subwoofer is used.
Mixer/
Preamplifier
Ch.1
Ch.2
Electronic
Controller
AC-120
Ch.1
Ch.2
Low Out
Power Amplifier
Speaker
Speaker
Subwoofer
Note
1. Set the equalizer selection switch (EQ) depending on the type of connected speakers.
2. 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.
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Block Diagram
— 5 —
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Specifications
Power Requirements
Power Consumption
Distortion
Hum & Noise
Channel Input
Channel Output
Low Frequency Output
Low Frequency Cut
Finish
Dimensions
Weight
AC Mains, 50Hz/60Hz
9W
Less than 0.05% ( + 4dB* 1kHz)
Less than –94dB* (20Hz~20kHz)
Rated input : +4dB*
electronically-balanced phone jack
Max. input level : +20dB*
Rated output : +4dB*
electronically-balanced phone jack
Max. output level : +20dB*
Rated output : +4dB*
electronically-balanced phone jack
Max. output level : +20dB*
Filter : Cutoff frequency slope 12dB/Oct 100Hz
6dB cut at 100Hz (F-120C used)
Panel : Aluminum (colored Alumirite), black
482.6(W) X 44(H) x 297.5(D)mm [19.00" x 1.73" x 11.71"]
3.7kg [8.16 Ib.]
0dB = 0.775V RMS
Specifications are subject to change without notice.
Accessories :
Instruction manual
Warranty card (for USA and Canada only)
1
1
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Appearance
Unit : mm(in)
— 7 —
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TOA Corporation
KOBE, JAPAN
133-12-080-80
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