Toa P-150M Instruction Manual

TOA ELECTRIC CO, LTD.
KOBE, JAPAN
TOA PROFESSIONAL POWER AMP
Operating Instruction Manual
Model P-150M, P-300M

Contents
Precautions................................................ 2
General Description........................................ 2
Features................................................... 3
Speci ications ........................................... 4~5
Per ormance 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 —

1. XLR type audio connectors are actory wired as ollows.
Pins 1 and 2 are ground (shield); pin 3 is hot (high, plus).
The connector wiring changes with use o an optional matching trans ormer.
(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 ampli ier outputs parallel to each other.
4. Do not operate the ampli ier rom a power mains which exceeds the
indicated mains voltage by more than 10%.
5. Never connect the output o the ampli ier to any other power source.
6. Do not expose the ampli ier to corrosive chemicals or liquids, such as so t
drinks, salt water, etc.
7. Always re er the ampli ier to quali ied technical service personnel. There
are no user servicable parts inside.
The P-150M and P-300M are pro essional quality single channel (mono) power
ampli iers, with 8 ohm outputs and built-in output trans ormers or 25-volt and
70-volt lines, designed or commercial and pro essional 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 eature provisions or octal socket mounting o matching trans ormers 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 ilter. These eatures combine to ensure an extremely high
level o reliability and durability.
Each ampli ier is mechanically rein orced with a rugged ront panel made o
3mm(l/8") thick cast-aluminum, and urther strengthened by use o 3mm(l/8")
thick steel liner, thus enabling them to withstand even the roughest use.
For easy maintenance and service, the ampli iers are built with modular, plug-in
boards on a sub-chassis that can be quickly removed or repair or replacement.
General Description
Precautions
— 2 —

Features
1. Ma netic Circuit Breaker Power Switch
Both the primary mains (A.C. line) overload protection and the on/o switch
are combined into a rocker-actuated, magnetic circuit breaker whose
operation, unlike uses, is predictable and independent o temperature.
Returning the switch to the "on" position resets the system.
2. Calibrated Input Attenuator
A 22-step detented input attenuator is provided or easy, accurate input
sensitivity adjustment. The attenuators are in 2dB steps rom 0dB
attenuation to -34dB, then in steps o -37dB, -42dB, -50dB, in inity. This
arrangement provides a smooth, noise ree transition rom the highest to the
lowest audio level.
3. Short-Circuit Protection Circuitry
Speaker protection is provided with relay circuitry that disconnects the load
whenever a short-circuit or harm ul D.C. current is present across the output
terminals.
4. 3-Second Turn-On Delay
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 o .
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 (Includin Thermal Warnin )
The LED illuminates when the protection relay is activated in the ollowing
situations.
1) Short-circuit
2) D.C. dri t
3) Turn-on delay
The LED also lashes when either o two heat sinks reaches more than 105°C
in temperature.
7. Si nal Presence Indicator LED
The LED glows when a signal greater than -30dB level is ed to the inputs
regardless o the input attenuator setting and output power level. The LED is
help ul in assuring su icient input signal is ed to drive the ampli iers.
8. Peak Indicator LED
The LED is actuated by means o an input/output comparator, and glows
when the output signal is clipped.
9. Ground Terminal Strip
Provision or isolating chassis ground rom signal ground is provided on the
rear panel.
10. Heavy Aluminum Die-Cast Panel
The power ampli iers are constructed to withstand even the roughest use on
the road. Their aluminum die-cast ront panels are mountable in standard
19-inch rack. A pair o sturdy carrying handles provides protection or the
ront panel controls and easy handling.
11. Built-in Matchin Transformer
The matching trans ormer is provided or a constant voltage distribution
system o 70 volts or 25 volts.
— 3 —

(DIRECT OUTPUT)
Power Output
150 watts minimum sine wave continuous average power
output with 8-ohms loads over a power band rom 20Hz to
20kHz. The maximum Total Harmonic Distortion (THD)
at any power level rom 250 milliwatts to 150 watts shall
be not more than 0.1%.
220 watts minimum sine wave continuous average power
output with 4-ohm loads over a power band rom 20Hz to
20kHz. The maximum Total Harmonic Distortion (THD)
at any power level rom 250 milliwatts to 220 watts shall
be not more 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 than 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 requencies o 60Hz and 7kHz, mixed in a ratio
o 4:1, at power output o 50 watts into 8-ohms
Input Sensitivity
An input o +4dB (1.23V), ±0.5dB, produces an output o
150 watts into 8-ohm, INPUT ATTENUTOR set or
maximum level
Input Impedance
10k-ohms (unbalanced)
Dampin Factor
Greater than 150 at any requency rom 20Hz to 1kHz
Greater than 70 at any requency rom 20Hz to 20kHz
Impedance Actual Output
Less than 0.06 ohms at any requency rom 20Hz to 1kHz
Less than 0.12 ohms at any requency rom 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% o 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 Volta e
Less than ±10mV DC
Input Connectors
One "male" and one " emale" 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.
Accessory Socket
8-pin octal socket accepts an optional matching trans-
ormer module or 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 or signed presence
Red LED or output clipping
Red LED or circuit protection and thermal warning
Green LED or power ON.
Specifications (P-150M)
Controls
Input Attenuator
22-position, log-linear, detented and dB-calibrated input
attenuator attenuates input signal in 2dB steps rom 0dB
attenuation to -34dB, then in steps o -37dB, -42dB,
-50dB, in inity.
Circuit Breaker AC Switch
Accessory Switch (IN/OUT)
Bypass or octal socket
Overall Protection
AC line is protected by circuit breaker.
Protection LED lash when heat sink temperature reaches
more than 105°C.
Protection LED come on when the relay is activated by the
DC current low to output or by short circuit.
Turn On/Turn Off
No turn o transient. Three second delay turn on with
minimum thumps and no dangerous transients
AC Line Volta e
AC mains. 50Hz/60Hz
Power Consumption
400 watts maximum
Finish
Black painting
Dimensions (W×H×D)
483 × 133 × 475 (mm)
19 × 5-1/4 × 18-3/4 (inches)
Wei ht
18kg (40 lbs)
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 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 or load impedances o 4.2-ohms (25 volts) or 33-
ohm (70 volts).
— 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 rom 20Hz to
20kHz. The maximum Total Harmonic Distortion (THD)
at any power level rom 250 milliwatts to 300 watts shall
be not more than 0.1%.
480 watts minimum sine wave continuous average power
output with 4-ohm loads over a power band rom 20Hz to
20kHz. The maximum Total Harmonic Distortion (THD)
at any power level rom 250 milliwatts to 480 watts shall
be not more than 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 than 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 requencies o 60Hz and 7kHz, mixed in a ratio
o 4:1, at power output o 100 watts into 8-ohms
Input Sensitivity
An input o +4dB (1.23V), ±0.5dB, produces an output o
300 watts into 8-ohm, INPUT ATTENUATOR set or
maximum level
Input Impedance
10k-ohms (unbalanced)
Dampin Factor
Greater than 260 at any r equency r om 20Hz to 1kHz
Greater than 95 at any requency rom 20Hz to 20kHz
Impedance Actual Output
Less than 0.03 ohms at any requency rom 20Hz to 1kHz
Less than 0.08 ohms at any requency rom 20Hz to 20kHz
Hum and Noise
109dB below rated output (20Hz — 20kHz)
114dB below rated output (1HF-A weighted)
Rise Time
10 microseconds, or better (10% –90% o 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 Volta e
Less than ±10mV DC
Input Connectors
One "male" and one " emale" 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.
Accessory Socket
8-pin octal socket accepts an optional matching
trans ormer module or 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 or signal presence
Red LED or output clipping
Red LED or circuit protection and thermal warning
Green LED or power ON
Controls
Input Attenuator
22-position, log-linear, detented and dB-calibrated input
attenuator attenuates input signal in 2dB steps rom 0dB
attenuation to -34dB, then in steps o -37dB, -42dB,
-50dB, in inity.
Circuit Breaker AC Switch
Accessory Switch (IN/OUT)
Bypass or octal socket
Overall Protection
AC line is protected by circuit breaker.
Protection LED lash when heat sink temperature reaches
more than 105°C.
Protection LED come on when the relay is activated by the
DC current low to output or by short circuit.
Turn On/Turn Off
No turn o transient. Three second delay turn On with
minimum thumps and no dangerous transients
AC Line Volta e
AC mains. 50Hz/60Hz
Power Consumption
850 watts maximum
Finish
Black painting
Dimensions (W×H×D)
483 × 222 × 475 (mm)
19 × 8-3/4 × 18-3/4 (inches)
Wei ht
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 rom 30 Hz to 15kHz.
The maximum THD at any power level rom 250
milliwatts to 300 watts shall be no more than 0.5%.
Output Impedance
Designed or load impedances o 2.1-ohms (25 volts) or 16-
ohms (70 volts).
— 5 —

Performance Graphs (P-150M)
P-150M DIRECT OUTPUT
POWER BANDWIDTH POWER OUTPUT vs LOAD IMPEDANCE
FREQUENCY RESPONSE
T.H.D. vs FREQUENCY T.H.D vs POWER OUTPUT
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
PHASE RESPONSE
— 6 —

P-150M TRANSFORMER OUTPUT
T.H.D. vs FREQUENCY
T.H.D. vs POWER OUTPUT (at 1kHz)
FREQUENCY RESPONSE
POWER CONSUMPTION POWER EFFICIENCY
Performance Graphs (P-150M)
— 7 —

Performance Graphs (P-300M)
P-300M DIRECT OUTPUT
POWER BANDWIDTH
POWER OUTPUT vs LOAD IMPEDANCE FREQUENCY RESPONSE
T.H.D. vs FREQUENCY T.H.D vs POWER OUTPUT
INTERMODULATION DISTORTION
VS POWER OUTPUT
MEASURED WITH A 4 : 1 MIX AT 60 Hz and 7 kHz
DAMPING FACTOR vs FREQUENCY
AT 8 LOAD IMPEDANCE
ACTUAL OUTPUT IMPEDANCE
vs FREQUENCY
PHASE RESPONSE
— 8 —

P-300M TRANSFORMER OUTPUT
T.H.D. vs FREQUENCY
T.H.D. vs POWER OUTPUT (at 1kHz)
FREQUENCY RESPONSE
POWER CONSUMPTION
POWER EFFICIENCY
Performance Graphs (P-300M)
— 9 —