TOA Amplifier
TOA Amplifier
TOA Amplifier
TABLE OF CONTENTS
• Use the unit only with the voltage specified on the unit. • When moving the unit, be sure to remove its power
Using a voltage higher than that which is specified may supply cord from the wall outlet. Moving the unit with the
result in fire or electric shock. power cord connected to the outlet may cause damage
to the power cord, resulting in fire or electric shock.
• Do not cut, kink, otherwise damage nor modify the power When removing the power cord, be sure to hold its plug
supply cord. In addition, avoid using the power cord in to pull.
close proximity to heaters, and never place heavy
objects -- including the unit itself -- on the power cord, as • Do not block the upper panel ventilation slots in the unit's
doing so may result in fire or electric shock. cover. Doing so may cause heat to build up inside the
unit and result in fire.
• Be sure to replace the unit's terminal cover after
connection completion. Because the voltage of up to 100 • Avoid installing the unit in humid or dusty locations, in
V is applied to the high impedance speaker terminals, locations exposed to the direct sunlight, near the heaters,
never touch these terminals to avoid electric shock. or in locations generating sooty smoke or steam as doing
otherwise may result in fire or electric shock.
• Be sure to ground to the safety ground (earth) terminal to
avoid electric shock. Never ground to a gas pipe as a When the Unit is in Use
catastrophic disaster may result.
• Do not place heavy objects on the unit as this may cause
When the Unit is in Use it to fall or break which may result in personal injury
and/or property damage. In addition, the object itself may
• Should the following irregularity be found during use, fall off and cause injury and/or damage.
immediately switch off the power, disconnect the power
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2. GENERAL DESCRIPTION
TOA's Basic PA Amplifiers A-1031, A-1061, and A-1121 are high cost-performance mixer power amplifiers suited for
broadcasting paging or background music in schools, offices, and shops.
3. FEATURES
• High durability, high reliability, and high cost performance.
• Three microphone inputs, two AUX inputs, and one recording output.
• Speaker outputs of constant voltage distribution system (100 V and 70 V) and low impedance (4 Ω).
• Operates on both AC and DC power.
• Muting function.
• Independent input volume controls and master volume control.
• Independent tone controls cut both high and low frequencies.
• Power voltage selector of 110 – 120 V or 220 – 240 VAC (LH version).
• MIC 1 input is a 5-pin DIN connector to provide muting control and phantom power for condenser microphones. (ER and
UK versions).
• Five-segment output level meter provides at-a-glance monitoring of output status.
• Current limiter circuitry protects transistors, and the thermal protection circuitry prevents a failure due to overheat.
4. PANEL FACILITIES
④ ⑤ ⑦ ⑧ ⑥ ② ① ⑨ ⑩ ⑮ ⑭ ⑬ ⑫ ⑪
[Rear panel (LH version)] ⑰ [Rear panel (ER/UK versions)] ⑰ ⑱
⑯ ⑨ ⑩ ⑮ ⑭ ⑬ ⑫ ⑪ ⑨ ⑩ ⑮ ⑭ ⑬ ⑫ ⑪
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⑨ AC power cord ⑭ Recording output
Connects to an AC power source. Connect to a cassette tape recorder.
5. MUTING FUNCTION
● H version
When MIC 1 input is used, it takes precedence and automatically reduces the volume of MIC 2 and MIC
3 inputs by 0 to –30 dB, which is adjustable with the MUTE control on the rear panel. The attenuation
level is preset for –30 dB at the factory.
● R and UK versions
Shorting DIN plug pins 4 and 5 of rear-mounted MIC 1 input allows MIC 1 input to reduce the volume of MIC 2 and MIC 3
inputs by 0 to –30 dB. The attenuation level is adjustable with the MUTE control on the rear panel and is preset for –30 dB
at the factory. Use TOA's microphone PM-222D or PM-660D to bring the best results.
2
5 4
Muting switch
3 1
● S version
Connect the supplied connector with lead wires to the muting connector on the rear panel, and the lead wires to the
muting switch. Turning on (shorting) the muting switch allows MIC 1 input to take precedence, muting signals of inputs of
MIC 1 and 2, and AUX 1 and 2 by 0 to –30 dB. The attenuation level is adjustable with the rear-mounted muting control,
and is preset for –30 dB at the factory.
Muting switch
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6. CONNECTION EXAMPLE
● LH version
AC mains
or Radio tuner
Horn speaker
- +
Column speaker
● R and UK versions
*1
AC mains
or Radio tuner
Horn speaker
- +
Column speaker
Microphones Microphone
12 V DC Battery (A-1031, A-1061) Cassette tape recorder (600 Ω, unbalanced) (600 Ω, balanced)
24 V DC Battery (A-1121)
PHANTOM PHANTOM
Fig. A Fig. B
ON OFF ON OFF
PHANTOM PLUG
5
● S version
(Only the functions that differ from those of the ER and UK versions are described here. For connections not described,
refer to the connections of other versions.)
*2
AC mains Microphone
(600 Ω, balanced)
*2 Muting terminal
Connect the supplied connector plug with lead wires to the muting connector on the rear panel, and the lead wires to the
muting switch. Turning on (shorting) the muting switch allows MIC 1 input to take precedence, muting signals of other
inputs (MIC 1 and 2, and AUX 1 and 2 ).
7. DIMENSIONAL DIAGRAM
(unit: mm)
262
230
420
24 20
8-M4
58.4
88.4
103
15
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8. BLOCK/LEVEL DIAGRAM
● H version
MIC1 HA
Low cut High cut
HA
MIC2
30 W, 60 W, 120 W 100 V
70 V
HA PA
MIC3
4Ω
COM
AUX1 NF
LEVEL
METER
AUX2 AC
MAINS
DC POWER 30 W, 60 W 12 V • 120 W 24 V
● ER and UK versions
Phantom
MIC1 EB HA
Low cut High cut
MUTE BA TC BA REC OUT
HA
MIC2
30 W, 60 W, 120 W 100 V
70 V
HA PA
MIC3
4Ω
COM
AUX1 NF
LEVEL
AC METER
AUX2
MAINS
DC POWER 30 W, 60 W 12 V • 120 W 24 V
● AS version
MIC1 EB HA
Low cut High cut
MUTE MUTE BA TC BA
REC OUT
MIC2 HA
30 W, 60 W, 120 W 100 V
70 V
HA PA
MIC3
4Ω
COM
AUX1 NF
LEVEL
AC METER
MAINS
DC POWER 30 W, 60 W 12 V • 120 W 24 V
Power out
100 V line
40 dB
30 dB
20 dB
10 dB
REC OUT
0 dB
-10 dB
AUX2
-20 dB
AUX1
-30 dB
-40 dB
-50 dB MIC1, 2, 3
-60 dB
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9. SPECIFICATIONS
Note: The design and specifications are subject to change without notice for improvement.
Specifications are measured on 240 VAC power operation.
The LH versions operating voltage is factory-preset at "220 V – 240 VAC".