Toa A-901A Operating Instructions Manual
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Toa A-901A Operating Instructions Manual

900 series mixer power amplifier
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TOA NEW 900 SERIES
MIXER POWER AMPLIFIER
Features
1
3-channel mixer power amplifier
2
Wide frequency response; 20 — 20,000 Hz, ±1dB
3
Low distortion and noise level
4
Excellent output regulation
5
Bass and treble controls on Input #1 and Program Input
6
Incorporated muting circuit
7
Self-protecting circuitry design
8
A full range of plug-in modules
9
Varied output impedances; 4 and 8 ohms, 25 and 70 volts
10
Clipping indicator
11
Compactness and lightweight
12
Portable or rack-mounting type
TOA Corporation
Operation Instruction Manual

General Description

The TOA A-901A Mixer Power Amplifier controls and mixes up to
three independent input signals. Producing 10 watts of power, the
A-901A has ideal flexibility for small sound reinforcement systems.
Optional accessory modules are available for use with the A-901 A to
provide versatility for a wide range of operating applications. Edge
connectors on the rear of the unit permit the selection of TOA plug-
in modules : The H-01 series, H-02 series and H-03 series Micro-
phone Preamplifiers, the 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, the
I-01
Paging Input for combining with TOA Intercom Systems
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
1kHz sine wave for testing within the total system. Other features
include a muting function. Sources fed to Program Input and
Input 1 are simultaneously muted by short-circuiting at MUTE
TERMINAL on the rear. Accordingly, Input 2 can have priority.
The
TOA
A-901 A
Mixer
Power
isolated output terminals to match 4- or 8-ohm speaker systems, or
speaker distribution systems may be connected to the 25 or 70-volt
terminals.
The A-901 A can be rack mounted by using the MB-920 Rack-
mounting Bracket Accessory.
A-901A
Amplifier
has transformer-
1 3 3 - 0 2 - 7 3 5 - O A
Printed in Japan

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Summary of Contents for Toa A-901A

  • Page 1: General Description

    Optional accessory modules are available for use with the A-901 A to provide versatility for a wide range of operating applications. Edge connectors on the rear of the unit permit the selection of TOA plug- in modules : The H-01 series, H-02 series and H-03 series Micro- phone Preamplifiers, the E-01 Mag.

  • Page 2: Front Panel Controls And Features

    TOA NEW 900 SERIES Front Panel Controls and Features Item Name Function/Description POWER ON-OFF Applies line power. Two-position SWITCH pushbutton switch for on-off modes. POWER Illuminates when power is on. INDICATOR Green light-emitting diode. (LED) Turns to red when the output exceeds just above the power rating.

  • Page 3: Input Connections

    Input Connections This unit has two inputs for PLUG-IN MODULES and a program input. Plug the modules into INPUT PORTS, sliding them between the guide rails, and secure each with two screws. CAUTION Modules should removed while the A-901 A is turned on. When not all INPUT PORTS are occupied, cover the vacant PORTS with blank panels, and secure them with screws.

  • Page 4: Rack Mounting

    TOA NEW 900 SERIES Rack Mounting To mount the A-901A in a standard 19-inch equipment r a c k , use the MB-920 Rack-mounting Bracket accessory. Remove 4 screws securing case. MB-920 (Silver) (OPTION) Fix MB-920 with attached 4 screws.
  • Page 5 Specifications A-901A Type Output Power Power Band Width Frequency Response Total Harmonic Distortion Inputs Input Sensitivity/Impedance Outputs (Transformer- isolated) Output Regulation (1 kHz) Signal to Noise Ratio (Band Pass 20 - 20,000 Hz) Tone Controls Centered Tone Controls Controls Indicators...
  • Page 6 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 8 TOA NEW 900 SERIES Block Diagrams (Plug-in Modules) - 8 -...
  • Page 9 Mute Terminal Operation A built-in MUTE circuit of the A-901A mutes signals fed to both PROGRAM INPUT and INPUT PORT #1 at the same time when the above remote switch is closed. Ensure that the INPUT PORT #2 is used when mounting the H-31 or H-32 on the A-901A.
  • Page 10 TOA NEW 900 SERIES...

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