TOA Electronics Music Mixer 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  
PARTS INSIDE THE PRODUCT ARE A  
CAUTION  
TO REDUCE THE RISK OF ELECTRICAL  
RISK  
OF  
ELECTRIC  
SHOCK  
TO  
PERSONS.  
SHOCK, DO NOT REMOVE  
NO USER SERVICEABLE PARTS INSIDE.  
REFER SERVICING TO QUALIFIED  
SERVICE PERSONNEL.  
COVER.  
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  
2
2
2
NOMENCLATURE AND FUNCTIONS  
INTERNAL SWITCH SETTINGS  
BLOCK AND LEVEL DIAGRAM  
DIMENSIONAL DIAGRAM  
SPECIFICATIONS  
3,4  
5
6
6
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  
 
4. NOMENCLATURE AND FUNCTIONS  
[Front Panel]  
Input level controls [1-6] (1-2 : Monaural input,  
3-6 : Stereo input)  
Equalizer controls [EQ : LOW, HIGH]  
These controls adjust stereo output signal tone.  
These controls adjust the input level of each  
channel.  
LOW : Low frequency adjustment  
(20Hz, 15dB shelving)  
Assign buttons [ST, 1, 2]  
HIGH : High frequency adjustment  
(20kHz, 15dB shelving)  
These buttons select the output to which the  
post-input level control signals are delivered.  
Stereo output level control [STEREO]  
This control adjusts a stereo output level.  
ST : Stereo output  
1 : MONO 1 output  
2 : MONO 2 output  
Monaural output level controls [MONO 1, 2]  
These controls adjust each monaural output  
level.  
Assign button cover  
This cover protects the assign switch setting  
from accidental change. It can also be used as  
a writing block.  
Power button and power lamp [POWER]  
This button switches power on (the power lamp  
lights) and off (the lamp is extinguished).  
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.)  
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  
Impedance  
Connector type  
XLR TYPE  
Rated level  
Maximum level  
Nomenclature  
-
6 0 dB*  
-
3 0 dB*  
MIC  
CH1, CH2  
(MONO  
INPUT)  
-40dB*  
-
10dB*  
MIC (PAD)  
LINE  
(ELECTRICAL BAL)  
PHONE (UNBAL)  
-
1 0 dB*  
RCA PIN (UNBAL)  
(CH6••••& PHONE)  
CH3~CH6  
-
10dB*  
(STEREO INPUT L, R)  
STEREO  
PHONE (UNBAL)  
PHONE (UNBAL)  
+4dB*  
+20 d B*  
+20 dB*  
(L/M, R)  
SUB  
INPUT  
MONO  
+
4dB*  
(1,2)  
STEREO OUTPUT  
(L,R)  
PHONE (UNBAL)  
PHONE (UNBAL)  
RCA PIN (UNBAL)  
+4dB*  
+4dB*  
+20 dB*  
+20 dB*  
+6dB*  
MONO OUTPUT  
(1,2)  
REC OUTPUT  
(L,R)  
-
1 0 dB*  
* 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  
MONO OUT (1,2)  
: - 98 dB*or less  
Noise Level  
(A-Weighted)  
STEREO, MONO 1 , 2 MAX.  
STEREO OUT (L , R) : - 94 dB*or less  
MONO OUT (1,2) : - 95 dB*or less  
AC mains  
Power Requirement  
Power Consumption  
120 V version : 10 W, 220-240 V version : 12 W  
482.6 (W) x 44.0 (H) x 301.8 (D) mm  
19 (W) x 1.73 (H) x 11.88 (D) in.  
3.8kg (8.38 Ib.)  
Dimensions  
Weight  
Finish  
Black  
Rack-mounting screw  
Rubber foot  
4
4
1
Knob(blue, small)  
2
2
2
2
Knob(red, small)  
Knob(blue, large)  
Knob(red, large)  
Standard Accessories  
Operating instructions  
*0 dB=0.775 V rms  
Specifications are subject to change without notice.  
7
 
TOA Corporation  
Printed in Japan  
133-12-225-10  
 

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