TOA Electronics M-243 User Manual

110.33 Kb

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.

2

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).

3

[Rear Panel]

For technical details of each input and output, refer to the section "8. SPECIFICATIONS".

Monaural input terminals (1,2) [MIC, LINE]

Select either MIC or LINE for connection. If both are connected, LINE input takes precedence.

Stereo input jacks (3-6) [L , R]

Only CH6 RCA jacks are connected in parallel with phone jacks.

Stereo sub-input terminals [SUB IN STEREO L / M, R]

Signals from these terminals are assigned to stereo output buses that go to the stereo output. Connecting only "L" will input to both "L" and "R".

Monaural sub-input terminals [SUB IN MONO 1,2]

Signals from these terminals are assigned to monaural output buses that go to monaural output 1 and 2.

Recording output jacks [REC L , R]

 

These stereo recording jacks output the signal from the

stereo output bus.

Stereo output jacks [STEREO OUT L , R]

 

Monaural output jacks [MONO OUT 1, 2]

 

These jacks also function as stereo sum outputs

by internal switch setting. (Refer to the section

"5. INTERNAL SWITCH SETTINGS".)

 

AC inlet

 

Connect the supplied power cord to this inlet.

 

4

5. INTERNAL SWITCH SETTINGS

[CAUTION]

THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO AVOID ELECTRIC SHOCK DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. REFER ALL SERVICING TO QUALIFIED SERVICE PERSONNEL

The M-243 mixer enables the following functions by setting internal switches.

(1) [PAD switch]

Setting this switch to IN position will place a pad (20dB) in the monaural input (MIC input).

(2) [HPF switch]

Setting this switch to IN position will place a high-pass filter (300Hz, -6dB/oct) in the monaural input.

(3) [GND switch]

Setting this switch to LIFT position will cut a ground loop which generates noise.

(4) [MONO1] and [MONO 2] switches

Setting each switch to ST SUM position will change each monaural output to stereo sum output.

How to open the mixer case

<Switch location>

 

Rear Panel

1. Set the power switch to OFF and unplug the power cord from

 

a wall outlet.

 

2. Remove case fixing screws (10 places).

 

4 each at left and right mounting brackets = 8

 

1 each at both sides (back of side panel) = 2

 

3. Remove the case.

 

4. Replace the case after setting change completion.

 

[Precautions]

Front Panel

To avoid electrical shocks and equipment failures, do not touch the internal components other than switches. Each internal switch is factory-preset to the reverse direction of that which is indicated above by the arrow.

5

6. BLOCK AND LEVEL DIAGRAM

7. DIMENSIONAL DIAGRAM

6

8. SPECIFICATIONS

Inputs and Outputs

Nomenclature

Rated level

Maximum level

Impedance

Connector type

CH1, CH2

MIC

-60dB*

-30dB*

 

XLR TYPE

 

 

 

 

 

 

 

(MONO

 

MIC (PAD)

-40dB*

- 10dB*

 

(ELECTRICAL BAL)

INPUT)

 

 

 

LINE

-10dB*

 

PHONE (UNBAL)

 

 

 

CH3~CH6

- 10dB*

 

RCA PIN (UNBAL)

(STEREO INPUT L, R)

 

(CH6••••& PHONE)

 

 

 

 

 

STEREO

+4dB*

+20 d B*

 

PHONE (UNBAL)

 

 

(L/M, R)

 

SUB

 

 

 

 

 

 

 

 

 

 

 

INPUT

 

MONO

 

 

 

PHONE (UNBAL)

 

 

+4dB*

+20 dB*

 

 

 

(1,2)

 

 

 

 

 

 

 

STEREO OUTPUT

+4dB*

+20 dB*

 

PHONE (UNBAL)

 

(L,R)

 

 

 

 

 

 

MONO OUTPUT

+4dB*

+20 dB*

 

PHONE (UNBAL)

 

(1,2)

 

 

 

 

 

 

REC OUTPUT

- 10dB*

+6dB*

 

RCA PIN (UNBAL)

 

 

 

 

(L,R) * 0dB=0.775Vrms

General Specifications

Frequency Response 20 Hz -20 kHz (+1,-2dB)

Total Harmonic Distortion

Less than 0.01% (1 kHz , rated input/output)

 

 

ALL MIN.

 

 

 

 

STEREO OUT (L, R) : - 105 dB*or less

 

Noise Level

MONO OUT (1,2)

: - 98 dB*or less

 

(A-Weighted)

STEREO, MONO 1 , 2 MAX.

 

 

 

 

STEREO OUT (L , R) : - 94 dB*or less

 

 

MONO OUT (1,2)

: - 95 dB*or less

 

Power Requirement

AC mains

 

 

 

Power Consumption

120 V version : 10 W, 220-240 V version : 12 W

 

Dimensions

482.6 (W) x 44.0 (H) x 301.8 (D) mm

 

 

19 (W) x 1.73 (H) x 11.88 (D) in.

 

 

 

 

 

Weight

3.8kg (8.38 Ib.)

 

 

 

Finish

Black

 

 

 

 

Rack-mounting screw

4

Knob(blue, small)

2

Standard Accessories

Rubber foot

4

Knob(red, small)

2

Operating instructions

1

Knob(blue, large)

2

 

 

 

 

Knob(red, large)

2

*0 dB=0.775 V rms

Specifications are subject to change without notice.

7

TOA Corporation

Printed in Japan

133-12-225-10