TP-Link P912A User Manual

Operation Instruction Manual

TOA NEW 900 SERIES

P906A

POWER AMPLIFIER

Features

1 Wide frequency response; 20 — 20,000 H z, ±1 d B
2 Low distortion and noise level
3 Excellent output regulation
4 A ful l range of plug-in modules
5 Self-protecting circuitry design
6 Varied output impedances; 4 and 8 ohms, 25 and 70 volts
7 Input level switch (selectable 1,000mV/100mV)
8 Portable or rack-mounting type

P912A

General Descriptions

The TOA P-906A and P-912A Power Amplifiers deliver up to 60
watts and 120 watts of power
harmonic distortion (THD) from 20 to 20,000 Hz (transformerless
4-ohm output). The P-906A and P-912A have a high-impedance
direct input and an input port (edge connector) to accept one
module accessory. Module selection is determined by application
among the TOA plug-in modules:
The H-01 series, H-02 series and H-03 series Microphone Pre­amplifiers, E-01 Mag. Phono Preamplifier, the X-01 series Auxiliary
Preamplifiers for high-level sources, the B-01 series Bridging Trans­formers for bridging high-impedance lines, the L-01 series Line
Matching Transformers for matching 600-ohm lines, 1-01 Paging
Input for combining with the TOA Intercom System EXES-1000,

EXES-5000 and EX-16, and the S-01, S-02 and S-03 Tone signal
generators for generating attention-getting signals and 1 kHz sine
wave for testing within the total system.
The P-906A and P-91 2A have a l ow-c ut sw it ch for a cu tof f frequency
of 60 Hz, and an input-level switch for input sensitivity of 1V

(0dBv) or 100mV (—20dBv). Output terminals provide connections
for 4-ohm and 8-ohm speakers, plus 25-volt and 70-volt speaker dis­tribution outlets.
With plug-in modules, the TOA P-906A and P-912A Power Am­plifiers may be used as a pre/power amplifier.
The P-906A and P-912A can be rack mounted by using the MB-931
Rack-mounting Bracket accessory. The PF-911 Perforated Panel
(1.73 inches, 1 rack unit) accessory provides suitable ventilation,
finished in color to match the P-906A and P -912A.

respectively

at

less

than 0.5%

total

Toa Electric Co., Ltd.

KOBE, JAPAN

133-02-740-6

Printed in Japan

Front Panel Controls and Features Rear Panel Controls and Features

Item

2

3

1

Name

POWER
ON-OFF
SWITCH

METER

INPUT
VOLUME
CONTROL

Function/Description

Applies line power. Two-position
pushbutton switch for on-off modes.

Indicates the output level of the
amplifier. At rated output, it shows
0 VU (at continuous sine-wave
signal input).

When power is turned on, meter

illuminates.

Adjusts gain of INPUT.

Item

1

2

3
4

5

6

7

8

9

10

Nam e

AC POWER
SUPPLY
CORD

AC OUTLET

(Unswitched)
AC FUSE
OUTPUT

FUSE

OUTPUT
TERMINALS

MODULE
INPUT
PORT

LOW-CUT
SWITCH

INPUT­LEVEL
SWITCH

DIRECT
INPUT
TERMINAL

EARTH

TERMINAL

Function/Description

Connects to power source.

Provides AC power for auxiliary equipment
with power consumption of up to 500W.

Protects amplifier from excessive current
drain. Replace only with same type fuse.
Refer to qualified service personnel if fuse
blows repeatedly.

P-906A
AC FUSE
OUTPUT FUSE

Connect to speakers.

Accepts PLUG-IN MODULES which are
optionally available. Module selection is
determined by application.

Cuts off unnecessary low frequency.

Selects input sensitivity. Place in "1V

(0dBv)" position when normally used

as a

power
Note: The position of INPUT-LEVEL
SWITCH should be changed according to
modules used or equipment connected to
DIRECT INPUT TERMINAL.

Connects directly to external equipment
without using modules. Unbalanced

10k ohms.

Normally connects to a record player's
ground.

amplifier.

250V 3A
250V 6A

P-912A
250V 5A
250V 10A

— —

1

Input Connections

Two types of input terminals are provided on the rear for input

•

connections.

(1) 2P terminal (marked HOT, E)

It is provided for direct input (unbalanced, 10k ohms) without
using plug-in module. This terminal is directly connected with

a potentiometer inside.

(2) Plug-in module input

Select the desired module according to application.

Plug th e module into INPUT PORT, sliding it between the guide

•

rails, and secure with two screws.

When INPUT PORT is not occupied, cover the PORT with the

•

blank panel, and secure it wit h screws.

Be sure that INPUT-LEVEL SWITCH is in the proper position

•

for the module used or the equipment connected to DIRECT

INPUT TERMINAL.

When the P-906A or P-912A is used in combination with a mixer

•

preamplifier or serves as an incremental power amplifier, normally

place INPUT LEVEL SWITCH in "1V ( 0 dB v)" position,

Plug-in Modules and Input Level SW Setting

Plug-in Modules

Balanced low impedance microphone preamp. module
(with presettable low-cut filter, high - cut filter a nd

gain controls)

Balanced low impedance microphone preamp. module

(with pressetable low-cut filter, high-cut filter

and gain controls, and remote control facilities)

Balanced low impedance microphone preamp. module
(with presettable low-cut filter and gain controls)

Balanced low impedance microphone preamp. module

(with presettable low-cut filter and gain controls,

and remote control facilities)

Unbalanced high impedance microphone preamp. module

(with presettable low-cut filter and gain controls)
Equalized mag. phono preamp. module

(with presettable gain control)
Unbalanced high impedance auxiliary preamp. module

(with presettable gain control)
Unbalanced high impedance auxiliary preamp. module

(with presettable gain control and remote control

facilities)

Balanced 10k
Balanced 600 line matching transformer module
Balanced paging input module

(with presettable gain control)

Signal tone generator module

(with presettable output level control)

1 kHz s in e wa ve

Yelp and buzzer

One-tone chime and continuous one-tone chime

bridging transformer module

Input Level SW Setting

Model

No,

H-01

H-21

H-02

H-22

H-03

E-01

X-01

X-21

B-01

L-01

l-01

S-01
S-02
S-03

See PLUG-IN MODULES for details.

1V

(0dBv)

-

_

-

-

-

-

-

-

0

o

-

-

100mV

(—20dBv)

0

0

0

o

0

o

0

o

0

o

0

0

— 2 —

Output Connections P-906A, P-912A

Installation

The speaker outputs of the amplifier are 4 , 8 , 25V and 70V.

Connect speakers to one of these outputs.
Class 2 wiring may be used.

Since these outputs consist of 8 , 25V and 70V via the output

transformer (matching transformer) and direct output of 4 , the
connecting method differs in each case. See the f o l l o w i n g di a gr am s .

Note: Impedances indicated below imply total speaker system

(load) impedance.

When connecting speakers to any one of the outputs of 8 O, 25V

•

or 70V (BALANCED TRANSFORMER OUTPUT);

Do not block cover ventilation holes.

•

•

The amplifier should not be placed in areas;

1. with poor ventilation.

2. exposed to direct sunlight.

3. with high ambient temperature or adjacent to heat-generating

equipment.

4. with high humidity or dusty levels.

5. susceptible to vibration.

Note:

When the temperature of heat sink exceeds 105°C, the protection
circuit is activated and the output is disconnected from the

circuit. The signal automatically begins to be output as the

temperature goes down. In such a case, confirm whether or not

unit is overloaded or operated on an excessive output.

Note:

In this case, the LOW-CUT SWITCH should be in "CUT" posi­tion. This amplifier is characteristically flat even in the low fre­quency range. Therefore, in TRANS OUTPUT, the acoustic
effect and frequency-response characteristics may be altered.

In TRANS OUTPUT, cut off unnecessary low frequency to ob­tain the best acoustic condition.

Place

the

SWITCH in "CUT" position

• When connecting speakers to the 4 output. (UNBALANCED

DIRECT OUTPUT);

LOW—CUT

— 3 —