TOA Electronics M-243 User Manual

STEREO MIXER

CAUTION

TO REDUCE THE RISK OF ELECTRICAL

SHOCK,	DO NOT	REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE.
REFER	SERVICING	TO QUALIFIED
SERVICE	PERSONNEL.

OPERATING INSTRUCTIONS

M-243

THE

LIGHTNING

FLASH

WITH

ARROWHEAD WITHIN A TRIANGLE IS

INTENDED TO TELL THE USER THAT

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	2
GENERAL DESCRIPTION	2
FEATURES	2
NOMENCLATURE AND FUNCTIONS	3,4
INTERNAL SWITCH SETTINGS	5
BLOCK AND LEVEL DIAGRAM	6
DIMENSIONAL DIAGRAM	6
SPECIFICATIONS	7

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

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.

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.

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.)

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).

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