TOA Electronics M-243 User Manual

OPERATING INSTRUCTIONS

STEREO MIXER M-243

THE LIGHTNING FLASH WITH

ARROWHEAD WITHIN A TRIANGLE IS

INTENDED TO TELL THE USER THAT

CAUTION

TO REDUCE THE RISK OF ELECTRICAL

SHOCK, DO NOT REMOVE COVER.

NO USER SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED

SERVICE PERSONNEL.

PARTS INSIDE THE PRODUCT ARE A

RISK OF ELECTRIC SHOCK TO

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.

TABLE OF CONTENTS

HANDLING PRECAUTIONS
GENERAL DESCRIPTION

FEATURES

NOMENCLATURE AND FUNCTIONS

INTERNAL SWITCH SETTINGS
BLOCK AND LEVEL DIAGRAM

DIMENSIONAL DIAGRAM

SPECIFICATIONS

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.

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TOA Corporation

1. HANDLING PRECAUTIONS

Operating voltage range is AC mains ±10% (50/60Hz).

Keep corrosive chemicals and beverages away from the unit as they may be spilt.

When any irregularity is found, be sure to contact your nearest TOA dealer. Make no further attempt to use

the unit to avoid electrical shocks.

2. GENERAL DESCRIPTION

The TOA M-243 is a 19" rack mountable (1 unit size) stereo mixer that comes with two monaural inputs, four

stereo inputs, one stereo output and two monaural outputs.

3. FEATURES

Two monaural inputs, four stereo inputs, one stereo output, and two monaural outputs. Each input signal

can be assigned to three outputs.

Sub-input for each bus line to the stereo output and two monaural outputs.

Microphone input or line input selectable for monaural input depending on the signal level. Internal limiter

minimizes signal distortion due to excessive input. Internal switches operate a high-pass filter function in the

input circuit, and a pad (20dB) function in the microphone input.

Signal clip indicator.

Automatic muting function (can be switched on and off) detects the monaural input signal and automatically
mutes the stereo output signal.

Stereo output has a recording output and equalizers for high and low frequencies.

Two monaural outputs also function as stereo sum outputs by internal switch setting.

Assign button cover serves as a writing block.

Knobs supplied in different colors for easy association with their respective controls.

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4. NOMENCLATURE AND FUNCTIONS

[Front Panel]

Input level controls [1-6] (1-2 : Monaural input,

3-6 : Stereo input)

These controls adjust the input level of each

channel.

Assign buttons [ST, 1, 2]

These buttons select the output to which the

post-input level control signals are delivered.

ST : Stereo output

1 : MONO 1 output

2 : MONO 2 output

Assign button cover

This cover protects the assign switch setting

from accidental change. It can also be used as

a writing block.

Clip indicator [PEAK]

This lamp lights when the signal reaches 3dB

below clipping. Adjust the signal level using

individual input level controls so that this lamp

lights only accidentally.

Equalizer controls [EQ : LOW, HIGH]

These controls adjust stereo output signal tone.

LOW : Low frequency adjustment

(20Hz, ±15dB shelving)

HIGH : High frequency adjustment

(20kHz, ±15dB shelving)

Stereo output level control [STEREO]

This control adjusts a stereo output level.

Monaural output level controls [MONO 1, 2]

These controls adjust each monaural output

level.

Power button and power lamp [POWER]

This button switches power on (the power lamp

lights) and off (the lamp is extinguished).

Mute ON/OFF button [AUTO MUTE]

This button turns on the muting facility when

pressed. (The muting indicator will light.) By

detecting the signal assigned to the stereo

output from channel 1 or 2, the signal assigned

to stereo outputs from channel 3 through

channel 6 is muted. (The signal assigned to the

monaural output is not muted.)

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