The Optimus P-120D dual power amplifier offers high-quality sound with 200W output per channel at 4 ohms or 120W at 83 ohms for high-impedance 100V lines. It features various output modes like stereo, BTL (bridged), and parallel, allowing for flexible speaker configurations. The built-in limiter and protection circuit ensure safe operation by preventing damage from overloads, short circuits, or overheating. Input and output levels can be remotely controlled or monitored via external equipment using the control I/O terminal.
The Optimus P-120D dual power amplifier offers high-quality sound with 200W output per channel at 4 ohms or 120W at 83 ohms for high-impedance 100V lines. It features various output modes like stereo, BTL (bridged), and parallel, allowing for flexible speaker configurations. The built-in limiter and protection circuit ensure safe operation by preventing damage from overloads, short circuits, or overheating. Input and output levels can be remotely controlled or monitored via external equipment using the control I/O terminal.
DUAL POWER AMPLIFIERS
DESCRIPTION
FEATURES
P-120D/P-120DH
The P-120D and P-120DH dual power amplifiers feature
high durability, quality sound, and high power output
(P-120D : 200 W when a 4 ohms load is connected,
P-120DH : 120 W when an 83 ohms load is connected
to the high-impedance 100 V line terminal). Input/output
levels and other functions can be remotely controlled or
monitored from external equipment. (An interface unit is
required.) Although the input is of balanced type, it can
be converted into the transformer-baranced input by
installing the optional matching transformer LT-101.
The amplifiers are ideal for sound system applications
including store and permanently installed sound
systems. The following different output modes can be
selected with the mode selector switch: Stereo, BTL
(P-120D only) and parallel outputs. In parallel mode, the
input level of each channel can be set independently.
Both amplifiers are designed for easy installation in
standard 19" equipment racks (2-unit size), and feature
rugged steel chassis construction, and a solid black
finish. LED indicators provide instant recognizable
readout of such operating conditions as signal, signal
clipping, protection circuit activation and level control
bypass. Front panel-mounted carrying handles can be
easily detached for installation in door-equipped racks.
Small in size (2-unit size) and light in weight.
The amplifiers ensure a high degree of safety by
largely reducing the rush current which flows when the
power is switched on.
The amplifiers employ a heat sink with large capacity
for natural air-cooling.
Different output modes are made available for
selection with the mode selector switch : Stereo, BTL
(P-120D only) and parallel outputs. In parallel mode,
the input level of each channel can be set
independently.
An internal limiter, provides current limiting during
overload, and a protection circuit disconnects the
output when it is short-circuited by detecting both
voltage and current levels. The protection circuit also
disconnects the output during an abnormal
temperature rise.
Large output screw terminals (10 mm in width) allow
connection of solderless terminals with diameter of 9.5
mm. Two positive (+) and negative (–) terminals are
provided, allowing four-core speaker cables to be
connected.
Control I/O terminal is provided. Input and output
levels can be remotely controlled or monitored with
external equipment. (An interface unit is required.)
Optional matching transformer LT-101 converts the
input into the transformer-balanced type.
Detachable handles can be easily removed from the
unit's front with a screwdriver.
AC inlet simplifies system maintenance after
installation.
Security cover prevents accidental changing set-up
after installation.
110100
100
10
1k
1k
[
W
]
[
W
]
POWER OUTPUT
POWER CONSUMPTION
P-120DH Both channel driven
110100
100
10
1k
1k
[
W
]
[
W
]
POWER OUTPUT
POWER CONSUMPTION
Power Consumption
P-120D Both channel driven
These data were measured by using the 230 V version.
Damping factor vs Frequency
100
10
1k
1k
10
100
10k
FREQUENCY
DAMPING FACTOR
[Hz]
50k20k
10k5k2k1k
500200
10050
20
0
-1
-2
[dB]
FREQUENCY
1
DEVIATION
[Hz]
4 Ω
8 Ω
Frequency response
P-120D One channel driven P-120D
0.1 1 10
POWER OUTPUT
THD
0.01
0.001
0.1
100
[
%
]
[
W
]
20 Hz
20k Hz
P-120D One channels driven/8 Ω
1k Hz
0.1 1 10
POWER OUTPUT
THD
0.01
0.001
0.1
100
[
%
]
[
W
]
20k Hz
1 kHz
20 Hz
P-120D BTL driven/8 Ω
P-120D One channels driven/4 Ω
0.1 1 10
POWER OUTPUT
THD
0.01
0.001
0.1
100
[
%
]
[
W
]
1k Hz
20 Hz
20k Hz
P-120D/P-120DH
CHARACTERISTIC DIAGRAMS
T.H.D vs Power output
4 Ω
8 Ω
PROTECTION CIRCUIT
VI LIMITER
SHORT DETECTOR
PROTECTION CIRCUIT
HEAT SINK
TEMPERATURE
SENSOR
CH2 POWER AMP CIRCUIT
PEAK
PROTECT
VR BYPASS
CONTROL I/O
HEAT SINK
TEMPERATURE
SENSOR
VI LIMITER
SHORT DETECTOR
CH1 POWER AMP CIRCUIT
INPUT
OUTPUT
PEAK
PROTECT
VR BYPASS
CONTROL I/O
ATT
OFF
ON
ATT
OFF
ON
VR CONTROL
STEREO
PARALLEL
BTL
STEREO
PARALLEL
BTL
-
-
-
-
+
+
+
+
CH1 OUTPUT
CH2 OUTPUT
SG
FG
VR CONTROL
POWER
INPUT
OUTPUT
CHANNEL 1
OPTIONAL
TRANSFORMER
H
C
E
CHANNEL 2
OPTIONAL
TRANSFORMER
H
C
E
PROTECTION CIRCUIT
VI LIMITER
SHORT DETECTOR
PROTECTION CIRCUIT
HEAT SINK
TEMPERATURE
SENSOR
CH2 POWER AMP CIRCUIT
PEAK
PROTECT
VR BYPASS
CONTROL I/O
HEAT SINK
TEMPERATURE
SENSOR
VI LIMITER
SHORT DETECTOR
CH1 POWER AMP CIRCUIT
INPUT
OUTPUT
PEAK
PROTECT
VR BYPASS
CONTROL I/O
ATT
OFF
ON
ATT
OFF
ON
VR CONTROL
STEREO
PARALLEL
-
-
-
-
+
+
+
+
CH1 OUTPUT
CH2 OUTPUT
SG
FG
VR CONTROL
POWER
OT
INPUT
OUTPUT
CHANNEL 1
OPTIONAL
TRANSFORMER
H
C
E
CHANNEL 2
OPTIONAL
TRANSFORMER
H
C
E
OT
P-120D/P-120DH
BLOCK DIAGRAMS
P-120DH
P-120D
P-120DH
Specifications are subject to change without notice.
Printed in Japan (003) 833-64-209-50 C.O
Accessory
10 kΩ : 10 kΩ
Less than 0.2 % (50 Hz, 5 dB*)
44 g
Within 1.5 dB (at 1 kHz, 1 V)
30 – 20,000 Hz at ± 0.15 dB
* 0 dB = 0.775 Vrms
SPECIFICATIONS
P-120D
Option
Matching transformer : LT-101
380 VA (Based on UL/CSA standards)
860 VA (720 W) (rated output, 4 Ω + 4 Ω)
0 dB = 0.775 Vrms
465
482
372
456
Unit : mm
34
76.2
88.4
102.4
4 – 6 x 10
Power Source
120 VAC, 60 Hz
230 VAC, 50/60 Hz
Power Consumption
Input Sensitivity
Input
+4 dB (1.23 V) ± 0.5 dB (input level control in maximum position)
2 channels : 200 W + 200 W (4 Ω), 120 W + 120 W (8 Ω)
BTL : 400 W (8 Ω)
M4 screw terminal (solderless terminal of 5.5 – 4 or 5.5 –5 usable.), distance between barriers : 10 mm
Output
10 kΩ (electrically – balanced), M3 screw terminal, distance between barriers : 6.4 mm, balanced phone jack
Frequency Response
20 – 20,000 Hz ( +0 dB, –0.5 dB)
Total Harmonic Distortion
0.01% (8 Ω, 1 kHz) 0.1% (8 Ω, 20 – 20,000 Hz)
Protection Circuit
Protection against excessive current flow due to overload, short circuit
(under 0.5 Ω), unusual DC voltage output, and heat sink temperature rise (over 110°C)
S/N Ratio
115 dB (20 – 20,000 Hz)
Air Cooling
Natural air cooling
Finish
Panel : Aluminum, black, almite
Case : Pre-coated steel plate, black
Dimensions 482 (W) x 102.4 (H) x 456 (D) mm
Weight
11 kg
Accessory
Power cord (2.5 m)
...
1, Fiber washer
...
4, Rack mounting screw
...
4, Decorative screw
...
4
P-120DH
Option
Matching transformer : LT-101
260 VA (Based on UL/CSA standards)
620 VA (500 W) (rated output, 83 Ω + 83 Ω)
0 dB = 0.775 Vrms
Power Source
230 VAC, 50/60 Hz
Power Consumption
Input Sensitivity
Input
120 VAC, 60 Hz
+4 dB (1.23 V) ± 0.5 dB (input level control in maximum position)
Output
10 kΩ (electrically – balanced), M3 screw terminal, distance between barriers : 6.4 mm, balanced phone jack
Frequency Response
70 – 20,000 Hz ( +0 dB, –3 dB)
Total Harmonic Distortion
0.05% (83 Ω, 1 kHz) 0.15% (83 Ω, 70 – 16,000 Hz)
Protection Circuit
Protection against excessive current flow due to overload, short circuit
(under 0.5 Ω), unusual DC voltage output, and heat sink temperature rise (over 110°C)
S/N Ratio
115 dB (20 – 20,000 Hz)
Air Cooling
Natural air cooling
Finish
Panel : Aluminum, black, almite
Case : Pre-coated steel plate, black
Dimensions 482 (W) x 102.4 (H) x 456 (D) mm
Weight
17 kg
Accessory
Power cord (2.5 m)
...
1, Fiber washer
...
4, Rack mounting screw
...
4, Decorative screw
...
4
2 channels : 120 W + 120 W (83 Ω : 100 V line),
M4 screw terminal (solderless terminal of 5.5 – 4 or 5.5 –5 usable.), distance between barriers : 10 mm
APPEARANCE AND DIMENSIONAL DIAGRAM
OPTIONAL TRANSFORMER
P-120D/P-120DH
LT-101
Impedance
Weight
Distortion
Constant Loss
Frequency Response
Sleeve
...
2, Screw
...
4
INPUT
URL : http://www.toa.co.jp/
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The Optimus P-120D dual power amplifier offers high-quality sound with 200W output per channel at 4 ohms or 120W at 83 ohms for high-impedance 100V lines. It features various output modes like stereo, BTL (bridged), and parallel, allowing for flexible speaker configurations. The built-in limiter and protection circuit ensure safe operation by preventing damage from overloads, short circuits, or overheating. Input and output levels can be remotely controlled or monitored via external equipment using the control I/O terminal.
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