Toa M-9000 Operation & Instruction Manual
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Toa M-9000 Operation & Instruction Manual

Toa M-9000 Operation & Instruction Manual

900 series mixer preamplifier
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TOA NEW 900 SERIES
MIXER PREAMPLIFIER
Features
1
6-channel mixer preamplifier
2
Wide frequency response; 20 — 20,000Hz, ±1dB
3
Low distortion and noise
4
Parallel operation of two mixer preamplifiers
5
Headphone output
6
Bass and treble controls
7
Tone defeat switch
8
Output on-off switch
9
VU meter range switch (selectable 4dBm/18dBm)
10
A full range of plug-in modules
11
Balanced and transformer-isolated output of 150/600 ohms
12
Portable or rack-mounting type
Toa Electric Co., Ltd.
KOBE, JAPAN
Operation Instruction Manual

General Description

The TOA M-900A Mixer Preamplifier controls and mixes up to six
independent input signals and delivers up to +20dBm of output
power. Optional plug-in modules are available for use with the M-
900A to provide versatility for a wide choice of operating applica-
tions. Edge connectors in the rear of the unit permit selection from
a wide range of TOA plug-in modules: the H-01 series, H-02 series
and H-03 series Microphone Preamplifiers, the E-01 and E-11 Mag.
Phono Preamplifiers for magnetic phono inputs, the X-01 series and
X-11 series Auxiliary Preamplifiers for high-level sources, the B-01
series and B-11 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, T-01
series Line Outputs for matching 600-ohm lines and the S-01, S-02
and S-03 Tone Generators for generating attention-getting signals
and 1kHz sine wave for testing within the total system. Sources fed
to particular input module accessories are muted by short-circuiting
at MUTE TERMINAL on the rear. To perform this function,
Module E-11, X-11 series or B-11 series is required.
The TOA M-900A Mixer Preamplifier has a balanced and trans-
formerisolated output for operation with 600-ohm or 150-ohm
loads.
Other features include a tone defeat switch, an output on/off
switch, connections for parallel coupling of another M-900A or
Mixer Power Amplifiers A-903A, A-906A or A-912A, and monitor-
ing by visual and/or audio means.
M-900A
1 3 3 - 0 2 - 7 3 6 - 1
Printed in Japan

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Summary of Contents for Toa M-9000

  • Page 1: General Description

    900A to provide versatility for a wide choice of operating applica- tions. Edge connectors in the rear of the unit permit selection from a wide range of TOA plug-in modules: the H-01 series, H-02 series and H-03 series Microphone Preamplifiers, the E-01 and E-11 Mag.

  • Page 2: Front Panel Controls And Features

    Front Panel Controls and Features Item Name Function/Description POWER ON-OFF Applies line power. Two-position SWITCH pushbutton switch for on-off modes. METER Indicates the output level of the amplifier. At rated output, it shows 0 VU (continuous sine-wave signal input). When power is turned on, meter illuminates.

  • Page 3: Input Connections

    Input Connections • This amplifier has six INPUT PORTS for PLUG-IN MODULES. Select the desired ones for each application. • Plug the modules into INPUT PORTS, sliding them between the guide rails, and secure each with two screws. • When not all INPUT PORTS are occupied, cover the vacant PORTS with blank panels, and secure them with screws.

  • Page 4: Operation

    In connecting a power amplifier with lower gain, so that the mixer preamplifier is required to be used with its higher output, the VU RANGE SWITCH shall be set to 18dBm. ADJUSTMENT OF TONE QUALITY When adjusting tone quality, place the TONE SWITCH in "IN"...

  • Page 5: Rack Mounting

    State date, nature of damage, whether any damage was noticed on the shipping container, prior to unpacking. Please give waybill number of shipping order. • Failure Should amplifier fail, contact your nearest TOA authorized con- tractor or service center. — 4 —...
  • Page 6 Block Diagram M-900 A — 5 —...
  • Page 7 Dimensions in mm (inches) (high) x (wide) x (deep) Weight (without input modules) Color Standard Accessories Other Features 6-channel mixer preamplifier +4 dBm (Rated Output) +20 dBm (max.) 30 - 20,000 Hz +20 dBm 0.5% THD 25 - 20,000 Hz +18 dBm 0.3% THD...
  • Page 8 TOA NEW 900 SERIES Plug-in Modules and Accessories (OPTION) The TOA PLUG-IN MODULES are suitable for TOA 900 SERIES MIXER POWER AMPLIFIERS A-901A, A-903A, A-906A, and A-912A MIXER PREAMPLIFIER M-900A, and POWER AMPLI- FIERS P-906A, P-912A and P-924. Owing to wide selection of MODULES, the desired applications will be obtained.
  • Page 9 TOA NEW 900 SERIES Plug-in Modules • FORNT PANEL CONTROL S AND FEATURE S Modules with built-in controls are provided in the following five types. — 8 — LOW-CUT FILTER GAIN CONTROL This adjusts gain. Turn clockwise (CW) to increase and counterclockwise (CCW) CONTROL to reduce gain.
  • Page 10 Block Diagrams (Plug-in Modules) — 10 —...
  • Page 11 REC out. It is provided with a presettable gain control. T-01 Series should be used exclusively for TOA 900 series, A-903A, A-906A, A-912A and M-900A. Use it only in Input Port #5 or #6 of the above models. It will not operate when connected into other PORTS.

  • Page 12: Optional Accessories

    By connecting this module to the exchange in place of an intercom station, paging is possible. It is provided with a pre- settable gain control. The I-01S is applicable to the TOA EXES- 1000, EXES-5000 and EX-16 Intercom Systems.
  • Page 13 Schemiatic M-900 A...

This manual is also suitable for:

M-900a

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