Toa P-150M, P-300M Operating Instructions Manual
Operating Instruction Manual
TOA PROFESSIONAL POWER AMP
Model P-150M, P-300M
TOA ELECTRIC CO, LTD.
KOBE, JAPAN
Contents
Precautions................................................ 2
General Description........................................ 2
Features................................................... 3
Specifications
...........................................
4~5
Performance Graphs ..................................... 6~9
Front Panel............................................... 10
Rear Panel................................................ 11
Input/Output Connections.............................. 12~14
Installation Precautions ................................ 15~17
25/70
Volt
Distribution
Systems
........................
18~19
Appearance ............................................... 20
— 1 —
Precautions
1. XLR type audio connectors are factory wired as follows.
Pins 1 and 2 are ground (shield); pin 3 is hot (high, plus).
The connector wiring changes with use of an optional matching transformer.
(Model No. PU-101T)
Pin 1 is ground (shield), Pin 2 is cold (low, minus), and pin 3 is hot (high,
plus).
2. Care should be taken in making connections, selecting signal sources and
controlling the output level to avoid any damage to loads.
3. Never place the two amplifier outputs parallel to each other.
4. Do not operate the amplifier from a power mains which exceeds the
indicated mains voltage by more than 10%.
5. Never connect the output of the amplifier to any other power source.
6. Do not expose the amplifier to corrosive chemicals or liquids, such as soft
drinks, salt water, etc.
7. Always refer the amplifier to qualified technical service personnel. There
are no user servicable parts inside.
General Description
The P-150M and P-300M are professional quality single channel (mono) power
amplifiers, with 8 ohm outputs and built-in output transformers for 25-volt and
70-volt lines, designed for commercial and professional sound applications.
The P-150M and P-300M deliver 150 watts and 300 watts, respectively, with 8 ohm
loads or with 25-volt or 70-volt distributed system loads.
Both feature provisions for octal socket mounting of matching transformers to
convert unbalanced inputs to balanced, magnetic circuit breakers, calibrated
input attenuators short circuit protection circuitry, 3-second turn-on delay,
current limiter protection circuitry, protection indicator LED's ground terminal
strip and high pass filter. These features combine to ensure an extremely high
level of reliability and durability.
Each amplifier is mechanically reinforced with a rugged front panel made of
3mm(l/8") thick cast-aluminum, and further strengthened by use of 3mm(l/8")
thick steel liner, thus enabling them to withstand even the roughest use.
For easy maintenance and service, the amplifiers are built with modular, plug-in
boards on a sub-chassis that can be quickly removed for repair or replacement.
— 2 —
Features
1. Magnetic Circuit Breaker Power Switch
2. Calibrated Input Attenuator
3. Short-Circuit Protection Circuitry
4. 3-Second Turn-On Delay
Both the primary mains (A.C. line) overload protection and the on/off switch
are combined into a rocker-actuated, magnetic circuit breaker whose
operation, unlike fuses, is predictable and independent of temperature.
Returning the switch to the "on" position resets the system.
A 22-step detented input attenuator is provided for easy, accurate input
sensitivity adjustment. The attenuators are in 2dB steps from 0dB
attenuation to -34dB, then in steps of -37dB, -42dB, -50dB, infinity. This
arrangement provides a smooth, noise free transition from the highest to the
lowest audio level.
Speaker protection is provided with relay circuitry that disconnects the load
whenever a short-circuit or harmful D.C. current is present across the output
terminals.
To help eliminate annoying clicks or pops which can occur upon turn-on in
large sound systems, a three second mute/delay circuit is incorporated. The
mute/delay circuit actuates the relay, and then disconnects the speaker the
instant the circuit breaker is shut off.
5. Current Limiter Circuitry
Protection against shorted and low impedance loads is provided with
dependable current limiting as well as protection against overloaded power
supplies and input overload.
6. Protection Indicator LED (Including Thermal Warning)
The LED illuminates when the protection relay is activated in the following
situations.
1) Short-circuit
2) D.C. drift
3) Turn-on delay
The LED also flashes when either of two heat sinks reaches more than 105°C
in temperature.
7. Signal Presence Indicator LED
The LED glows when a signal greater than -30dB level is fed to the inputs
regardless of the input attenuator setting and output power level. The LED is
helpful in assuring sufficient input signal is fed to drive the amplifiers.
8. Peak Indicator LED
The LED is actuated by means of an input/output comparator, and glows
when the output signal is clipped.
9. Ground Terminal Strip
Provision for isolating chassis ground from signal ground is provided on the
rear panel.
10. Heavy Aluminum Die-Cast Panel
The power amplifiers are constructed to withstand even the roughest use on
the road. Their aluminum die-cast front panels are mountable in standard
19-inch rack. A pair of sturdy carrying handles provides protection for the
front panel controls and easy handling.
11. Built-in Matching Transformer
The matching transformer is provided for a constant voltage distribution
system of 70 volts or 25 volts.
— 3 —
Specifications (P-150M)
(DIRECT OUTPUT)
Power Output
150 watts minimum sine wave continuous average power
output with 8-ohms loads over a power band from 20Hz to
20kHz. The maximum Total Harmonic Distortion (THD)
at any power level from 250 milliwatts to 150 watts shall
be not mo re t han 0.1%.
Controls
Input Attenuator
22-position, log-linear, detented and dB-calibrated input
attenuator attenuates input signal in 2dB steps from 0dB
attenuation to -34dB, th en in steps of -37dB, -42dB,
-50dB, i nfinity.
220 watts minimum sine wave continuous average power
output with 4-ohm loads over a power band from 20Hz to
20kHz. The maximum Total Harmonic Distortion (THD)
at any power level from 250 milliwatts to 220 watts shall
be not mor e than 0.15%.
160 watts continuous average sine wave power into 8
ohms with less than 0.1% THD, at 1 kHz.
Frequency Response
+0dB, -0.5dB, 20Hz to 20kHz
Total Harmonic Distortion
Less th a n 0.01% at 150 watts, 8-ohms, 1kHz
Less than 0.1% at 150 watts, 8-ohms, 20Hz to 20kHz
Intermodulation Distortion
0.05% using frequencies of 60Hz and 7kHz, mixed in a ratio
of 4:1, at power output of 50 watts into 8-ohms
Input Sensitivity
An input of +4dB (1.23V), ±0.5dB, produces an output of
150 watts into 8-ohm, INPUT ATTENUTOR set for
maximum level
Input Impedance
10k-ohms (unbalanced)
Damping Factor
Greater than 150 at any frequency from 20Hz to 1kHz
Greater than 70 at any frequency from 20Hz to 20kHz
Impedance Actual Output
Less than 0.06 ohms at any frequency from 20Hz to 1kHz
Less than 0.12 ohms at any frequency from 20Hz to 20kHz
Hum and Noise
110dB below rated output (20Hz — 20kHz)
115dB below rated output (IHF-A weighted)
Rise Time
10 microseconds, or better (10% -90% of 1 volt at 1kHz
square wave output)
Slew Rate
10 volts per microsecond, or better (at 50 watts into 8-ohm,
200kHz square wave input)
Phase Shift
20Hz to 20kHz, ±15 degrees
Offset Voltage
Less tha n ±10mV DC
Input Connectors
One "male" and one "female" XLR connector in parallel,
pin 2 "cold", pin 3 "hot", and pin 1 "shield". XLR's are
unbalanced and parallel to two tip-sleeve (standard)
phonejacks.
Circuit Breaker AC Switch
Accessory Switch (IN/OUT)
Bypass for octal socket
Overall Protection
AC line is protected by circuit breaker.
Protection LED flash when heat sink temperature reaches
more th an 105°C.
Protection LED come on when the relay is activated by the
DC current flow to output or by short circuit.
Turn On/Turn Off
No turn off transient. Three second delay turn on with
minimum thumps and no dangerous transients
AC Line Voltage
AC mains. 50Hz/60Hz
Power Consumption
400 watts maximum
Finish
Black painting
Dimensions (W×H×D)
483 × 133 × 475
19 × 5-1/4 × 18-3/4 (inches)
Weight
18kg (40 lb s)
(mm)
SPECIFICATION (TRANSFORMER OUTPUT)
Power Output
150 watts minimum sine wave continuous average power
output with either a 25-volt or 70-volt distribution system
over a power band f rom 30Hz to 15kHz.
The maximum THD at any power level 250 milliwatts to
150 watts shall be not more than 0.6%.
Output Impedance
Designed for load impedances of 4.2-ohms (25 volts) or 33ohm (70 volts).
Accessory Socket
8-pin octal socket accepts an optional matching transformer module for balanced input, or user options (pins
include ±VCC, signal input/output and circuit ground)
Output Connectors
Barrier Strip Terminal
Ground Terminal Strip
2 lug terminal block with removal shorting strap
Indicators
Green LED for signed presence
Red LED for output clipping
Red LED for circuit protection and thermal warning
Green LED for power ON.
— 4 —
Specifications (P-300M)
(DIRECT OUTPUT)
Power Output
300 watts minimum sine wave continuous average power
output with 8-ohm loads over a power band from 20Hz to
20kHz. The maximum Total Harmonic Distortion (THD)
at any power level from 250 milliwatts to 300 watts shall
be not more than 0.1%.
Controls
Input Attenuator
22-position, log-linear, detented and dB-calibrated input
attenuator attenuates input signal in 2dB steps from 0dB
attenuation to -34dB, then in steps of -37dB, -42dB,
-50dB, infinity.
480 watts minimum sine wave continuous average power
output with 4-ohm loads over a power band from 20Hz to
20kHz. The maximum Total Harmonic Distortion (THD)
at any power level from 250 milliwatts to 480 watts shall
be not mo re th a n 0.15%.
320 watts continuous average sine wave power into 8
ohms with less than 0.1% THD, at 1kHz.
Frequency Response
+0dB, -0.5dB, 20Hz to 20kHz
Total Harmonic Distortion
Less th an 0.01% at 300 watts, 8-ohms, 1kHz
Less than 0.1% at 300 watts, 8-ohms, 20Hz to 20kHz
Intermodulation Distortion
0.05% using frequencies of 60Hz and 7kHz, mixed in a ratio
of 4:1, at power output of 100 watts into 8-ohms
Input Sensitivity
An input of +4dB (1.23V), ±0.5dB, produces an output of
300 watts into 8-ohm, INPUT ATTENUATOR set for
maximum level
Input Impedance
10k-ohms (unbalanced)
Damping Factor
Gr eat er th a n 260 at any fr e q uen c y f r o m 20Hz t o 1 kHz
Greater than 95 at any frequency from 20Hz to 20kHz
Impedance Actual Output
Less than 0.03 ohms at any frequency from 20Hz to 1kHz
Less than 0.08 ohms at any frequency from 20Hz to 20kHz
Hum and Noise
109dB below rated output (20Hz — 20kHz)
114dB belo w rated output (1HF-A weighted)
Rise Time
10 microseconds, or better (10% –90% of 1 volt at 1kHz
square wave output)
Slew Rate
10 volts per microsecond, or better (at 100 watts into 8-
ohm, 200kHz square wave input)
Phase Shift
20Hz to 20kHz, ±15 degrees
Offset Voltage
Less than ±10mV DC
Input Connectors
One "male" and one "female" XLR connector in parallel,
pin 2 "cold", pin 3 "hot", and pin 1 "shield". XLR's are
unbalanced and parallel to two tip-sleeve (standard)
phonejacks.
Circuit Breaker AC Switch
Accessory Switch (IN/OUT)
Bypass for octal socket
Overall Protection
AC line is protected by circuit breaker.
Protection LED flash when heat sink temperature reaches
more th an 105°C.
Protection LED come on when the relay is activated by the
DC current flow to output or by short circuit.
Turn On/Turn Off
No turn off transient. Three second delay turn On with
minimum thumps and no dangerous transients
AC Line Voltage
AC mains. 50Hz/60Hz
Power Consumption
850 watts maximum
Finish
Black painting
Dimensions (W×H×D)
483 × 222 × 475
19 × 8-3/4 × 18-3/4 (inches)
(mm)
Weight
28kg (62 lbs)
SPECIFICATION (TRANSFORMER OUTPUT)
Power Output
300 watts minimum sine wave continuous average power
output with either a 25-volt or 70-volt distribution system
over a power band from 30 Hz to 15kHz.
The maximum THD at any power level from 250
milliwatts to 300 watts shall be no more than 0.5%.
Output Impedance
Designed for load impedances of 2.1-ohms (25 volts) or 16-
ohms (70 volts).
Accessory Socket
8-pin octal socket accepts an optional matching
transformer module for balanced input, or user options
(pins include ±VCC, signal input/output and circuit
ground)
Output Connectors
Barrier Strip Terminal
Ground Terminal Strip
2 lug terminal block with removal shorting strap
Indicators
Green LED for signal presence
Red LED for output clipping
Red LED for circuit protection and thermal warning
Green LED for power ON
— 5 —
Performance Graphs (P-150M)
P-150M DIRECT OUTPUT
POWER BANDWIDTH
T.H.D. vs FREQUENCY
POWER OUTPUT vs LOAD IMPEDANCE
T.H.D vs POWER OUTPUT
FREQUENCY RESPONSE
INTERMODULATION DISTORTION
VS POWER OUTPUT
MEASURED WITH A 4 : 1 MIX AT 60Hz and 7kHz
DAMPING FACTOR vs FREQUENCY
AT 8 LOAD IMPEDANCE
ACTUAL OUTPUT IMPEDANCE
vs FREQUENCY
— 6 —
PHASE RESPONSE
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