Toa A-903MK2 Operating Instructions Manual
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Toa A-903MK2 Operating Instructions Manual

900 series ii mixer power amplifier
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See also: Manual , Operating Instructions Manual
TOA 900 SERIES II
MIXER POWER AMPLIFIER
TO REDUCE THE RISK OF ELECTRICAL
SHOCK, DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.
Please follow the instructions in this manual to obtain the optimum results from this unit.
We also recommend that you keep this manual handy for future reference.
TOA Corporation

Operating Instructions

A-903MK2
A-906MK2
A-912MK2
THE
LIGHTNING
FLASH
ARROWHEAD WITHIN A TRIANGLE IS
INTENDED TO TELL THE USER THAT
PARTS INSIDE THE PRODUCT ARE A
RISK
OF
ELECTRIC
SHOCK
PERSONS.
THE EXCLAMATION POINT WITHIN A
TRIANGLE IS INTENDED TO TELL
THE
USER
THAT
IMPORTANT
OPERATING
AND
SERVICING
INSTRUCTIONS ARE IN THE PAPERS
WITH THE APPLIANCE.
WITH
TO

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Summary of Contents for Toa A-903MK2

  • Page 1: Operating Instructions

    Operating Instructions TOA 900 SERIES II A-903MK2 MIXER POWER AMPLIFIER A-906MK2 A-912MK2 LIGHTNING FLASH WITH ARROWHEAD WITHIN A TRIANGLE IS INTENDED TO TELL THE USER THAT PARTS INSIDE THE PRODUCT ARE A RISK ELECTRIC SHOCK PERSONS. TO REDUCE THE RISK OF ELECTRICAL THE EXCLAMATION POINT WITHIN A SHOCK, DO NOT REMOVE COVER.

  • Page 2: Table Of Contents

    Contents General description Features Nomenclature Front panel Rear panel Input connections Output connections (A-903MK2) Output connections (A-906MK2/A-912MK2) Muting and remote volume control connection Rack mounting Operation Volume adjustment Tone control adjustment Installation Servicing Specifications Appearance (A-903MK2) Appearance (A-906MK2/A-912MK2) –2–...

  • Page 3: General Description

    A-912MK2 120 watts. Optional plug-in modules are available for use with these mixer power amplifiers to provide versatility for a wide range of operating applications. Edge connectors on the rear of the unit permit the selection of the TOA plug-in modules.

  • Page 4: Nomenclature

    Nomenclature Front Panel Power Switch Input Volume Controls Adjust gain of input #1 ~#8 respectively. Applies line power. Two-position push button switch for on/off modes. Bass Control Power Indicator LED Modifies bass response. Turn clockwise to boost, Green LED lights when the power is switched counter-clockwise attenuate bass...

  • Page 5: Rear Panel

    Rear Panel AC Power Cord Preamp Out Connects to power source. Connects to a signal processing equipment such as a limiter, an equalizer, etc. The input AC Outlet (Unswitched) impedances of the equipment should be of more Provides AC power for auxiliary equipment with than 600 ohms.

  • Page 6: Input Connections

    Cover unoccupied INPUT PORTS with blank panels. Secure blank panels with screws. Output Connections (A-903MK2) The speaker outputs of the amplifier are 4 ohms, 8 ohms, 25V and 70V. Connect speakers to any one of these outputs.

  • Page 7: Output Connections (A-906Mk2/A-912Mk2) 7~8

    To connect speakers to 8-ohm output (UNBALANCED DIRECT OUTPUT) (A-903MK2) 8-ohm Loosen the screw. Place the impedance switch in 8-ohm position. Tighten the screw. Output Connection (A-906MK2/A-912MK2) The speaker outputs of the amplifier are 4 ohms, 8 ohms, 25V and 70V.

  • Page 8: Muting And Remote Volume Control Connection

    12mm (1/2"). Amplifier PF-511 perforated panel (1-unit size) Use the perforated panel PF-511 to provide space for ventilation, when two or more units are mounted in an equipment rack. Contact your local TOA dealer for the perforated panel PF-511. –8–...

  • Page 9: Operation

    Upon receipt of the amplifier shipment, please inspect for any damage incurred in transit. If damage is found, please notify your local TOA representative and the transportation company immediately. State date, nature of damage, whether any damage was noticed on the shipping container, prior to unpacking.

  • Page 10: Specifications

    Specifications A-903MK2 A-906MK2 A-912MK2 Type 8-channel mixer power amplifier Output Power 30W RMS 120WRMS 60W RMS (D) 20 ~20,000 Hz, 0.5% THD Power Band Width (T) 50 ~20,000 Hz, 0.5% THD (D) 20 ~20,000 Hz, ± 1 dB Frequency Response (T) 20 ~15,000 Hz, ±...

  • Page 11: Appearance (A-903Mk2)

    Appearance (A-903MK2) Front View Rear View Top View Side View –11–...

  • Page 12: Appearance (A-906Mk2/A-912Mk2)

    Appearance (A-906MK2/A-912MK2) Front View Rear View Top View Side View TOA Corporation PRINTED IN TAIWAN KOBE, JAPAN 133-12-114-60...

This manual is also suitable for:

A-906mk2A-912mk2

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