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TOA NEW 900 SERIES
POWER AMPLIFIER
Features
1
Wide frequency response; 20 — 20,000 Hz, ±1dB
2
Low distortion and noise level
3
Excellent output regulation
4
A full 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
Toa Electric Co., Ltd.
KOBE, JAPAN
Operation Instruction Manual
General Descriptions
The TOA P-906A and P-912A Power Amplifiers deliver up to 60
watts and 120 watts of power respectively at less than 0.5% total
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
s e r i e s , H-02 s e r i e s and
amplifiers, E-01 Mag. Phono Preamplifier, the X-01 series Auxiliary
Preamplifiers for high-level sources, the B-01 series Bridging Trans-
formers 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-912A have a low-cut switch for a cutoff 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 dis-
tribution outlets.
With plug-in modules, the TOA P-906A and P-912A Power Am-
plifiers 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.
P906A
P912A
H-03 series Microphone Pre-
1 3 3 - 0 2 - 7 4 0 - 6
Printed in Japan
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Table of Contents
Related Manuals for Toa P912A
Summary of Contents for Toa P912A
-
Page 1: Power Amplifier
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. P906A P912A 1 3 3 - 0 2 - 7 4 0 - 6 Printed in Japan... -
Page 2: Front Panel Controls And Features
Front Panel Controls and Features Item Name Function/Description POWER Applies line power. Two-position ON-OFF pushbutton switch for on-off modes. SWITCH METER 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. -
Page 3: Input Connections
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. -
Page 4: Installation
Output Connections P-906A, P-912A The speaker outputs of the amplifier are 4 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 connecting method differs in each case. -
Page 5: Operation
Operation When all connections are completed, turn power switch on. Then, the meter is illuminated. Approx. 5 seconds after switching power on, the amplifier comes into operation. ADJUSTMENT OF VOLUME CONTROL Adjust the input volume control to obtain appropriate output level. In normal use of BGM playing or announcement, the deflection of the meter is recommended to be within the range as indicated in the drawing. -
Page 7: Specifications
Specifications Type Output Power Power Band Width Frequency Response Total Harmonic Distortion One Input Port Inputs One Direct Input Note Input Port Input Sensitivity/Impedance Direct Input Outputs (D) - Direct (T) - Transformer Output Regulation (1 kHz) (D) Less than 0.5 dB, no load to full load Signal to Noise Ratio (Band Pass 20 —... - Page 8 Plug-in Modules and Accessories (OPTION) The TOA PLUG-IN MODULES are suitable for TOA 900 S E R I E S M I X E R POWER A M P L I F I E R S A-901A, A-903A, A-906A, and A-912A M I X E R P R E A M P L I F I E R M-900A, and POWER AMPLI- FIERS P-906A, P-912A and P-924.
- Page 9 TOA NEW 900 SERIES Plug-in Modules • FORNT PANEL CONTROLS AND FEATURES Modules with built-in controls are provided in the following five types. — 8 — LOW-CUT FILTER GAIN CONTROL This adjusts gain. Turn clockwise (CW) CONTROL to increase and counterclockwise (CCW) 330Hz, 6dB/oct to reduce gain.
- Page 10 TOA NEW 900 SERIES Block Diagrams (Plug-in Modules) — 10 —...
- Page 11 Operation and Connections • E-11, X-11, L-11, B-11 Series, H-31 and H-32 (with mute) Connections (M-900A, A-903A, A-906A, A-912A) Mute Terminal Operation When the switch is closed,, a. the signal fed to E-11, X-11, L-11 and B-11 are attenuated by approx.
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