STEREO MIxER M-243
OPERATING INSTRUCTIONS
Stereo Mixer
M-243
TABLE OF CONTENTS
1. IMPORTANT SAFETY INSTRUCTIONS ..... 2
6. internal switch settings .................. 6
3. GENERAL DESCRIPTION ............................ 4
8. DIMENSIONAL DIAGRAM ........................... 7
2. SAFETY PRECAUTIONS .............................. 3
4. FEATURES .................................................... 4
5. NOMENClATURE AND FUNCTIONS .......... 5
Front................................................................ 5
Rear ................................................................ 6
7. BLOCK AND LEVEL DIAGRAMS ................. 7
9. SPECIFICATIONS ......................................... 8
Accessories .................................................... 8
Thank you for purchasing TOA’s Stereo Mixer.
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.
1. IMPORTANT SAFETY INSTRUCTIONS
• Protect the power cord from being walked on
or pinched particularly at plugs, convenience
receptacles, and the point where they exit from the
apparatus.
• Read these instructions.
• Keep these instructions.
• Heed all warnings.
• Only use attachments/accessories specified by the
manufacturer.
• Follow all instructions.
• Do not use this apparatus near water.
• Clean only with dry cloth.
• Do not block any ventilation openings. Install in
accordance with the manufacturer's instructions.
• Do not install near any heat sources such as
radiators, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
• Do not defeat the safety purpose of the polarized
or grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding
type plug has two blades and a third grounding
prong. The wide blade or the third prong are
provided for your safety. If the provided plug does
not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
• Use only with the cart, stand,
tripod, bracket, or table specified
by the manufacturer, or sold with
the apparatus. When a cart is
used, use caution when moving
the cart/apparatus combination
to avoid injury from tip-over.
• Unplug this apparatus during lightning storms or
when unused for long periods of time.
• Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as power-supply cord or
plug is damaged, liquid has been spilled or objects
have fallen into the apparatus, the apparatus has
been exposed to rain or moisture, does not operate
normally, or has been dropped.
INSTRUCTIONS ESSENTIELLES POUR LA SÉCURITÉ
• Lire ces instructions.
• Conserver
ultérieure.
ces
instructions
pour
référence
• Respecter tous les avertissements.
• Suivre toutes les instructions.
• Ne pas utiliser cet appareil à proximité d'eau.
• Nettoyer uniquement à l'aide d'un chiffon sec.
• Ne pas obstruer les orifices de ventilation. Installer
conformément aux instructions du fabricant.
• Ne pas installer à proximité de sources de chaleur
telles que des radiateurs, des registres thermiques,
des chaudières ou d'autres appareils (notamment
des amplificateurs) produisant de la chaleur.
• Ne pas contourner la fonction de sécurité de la fiche
polarisée ou de mise à la terre. Une fiche polarisée est
équipée de deux broches, dont l'une est plus large que
l'autre. Une fiche de mise à la terre est équipée de deux
broches et d'une troisième pour la mise à la terre. Cette
dernière, la plus large, est prévue à des fins de sécurité.
Si la fiche fournie ne peut être insérée dans la prise
électrique souhaitée, consulter un électricien pour faire
remplacer cette dernière.
2
• Protéger le cordon d'alimentation pour éviter qu'il
ne soit piétiné ou pincé, notamment au niveau des
fiches, des prises de courant ou de son point de
sortie de l'appareil.
• Utiliser uniquement les accessoires spécifiés par le
fabricant.
• Utiliser uniquement avec le
chariot, support, trépied, la patte
de montage ou la table spécifiés
par le fabricant ou vendus avec
l'appareil. En cas d'utilisation
d'un
chariot,
manipuler
la
combinaison
chariot/appareil
pour éviter les blessures dues à
un renversement.
• Débrancher cet appareil pendant les orages ainsi
que lorsqu'il reste inutilisé pendant une période
prolongée.
• La maintenance de l'appareil doit être confiée à un
technicien après-vente qualifié. Une maintenance
s'avère nécessaire si l'appareil est endommagé
(au niveau du cordon d'alimentation ou de la fiche),
a été mouillé par un liquide, un objet est tombé à
l'intérieur, s'il a été exposé à la pluie ou l'humidité,
s'il ne fonctionne pas normalement ou s'il est tombé.
2. SAFETY PRECAUTIONS
• Before installation or use, be sure to carefully read all the instructions in this section for correct and safe
operation.
• Be sure to follow all the precautionary instructions in this section, which contain important warnings and/or
cautions regarding safety.
• After reading, keep this manual handy for future reference.
Safety Symbol and Message Conventions
Safety symbols and messages described below are used in this manual to prevent bodily injury and property
damage which could result from mishandling. Before operating your product, read this manual first and
understand the safety symbols and messages so you are thoroughly aware of the potential safety hazards.
WARNING
CAUTION
Indicates a potentially hazardous situation which, if mishandled, could
result in death or serious personal injury.
Indicates a potentially hazardous situation which, if mishandled, could
result in moderate or minor personal injury, and/or property damage.
WARNING
AVERTISSEMENT
When Installing the Unit
Lors de l’installation de l’appareil
• Do not expose the unit to rain or an environment
where it may be splashed by water or other liquids,
as doing so may result in fire or electric shock.
• Ne pas exposer l’appareil à la pluie et le protéger de
tout contact avec de l’eau ou d’autres liquides afin
d’éviter un incendie ou une électrocution.
• Use the unit only with the voltage specified on
the unit. Using a voltage higher than that which is
specified may result in fire or electric shock.
• Do not cut, kink, otherwise damage nor modify
the power supply cord. In addition, avoid using the
power cord in close proximity to heaters, and never
place heavy objects -- including the unit itself -- on
the power cord, as doing so may result in fire or
electric shock.
• Since the unit is designed for in-door use, do not
install it outdoors. When it gets wet with rain, there
is a danger of electric shock.
• The apparatus shall be connected to a mains socket
outlet with a protective earthing connection.
• The socket-outlet shall be installed near the
equipment and the plug shall be easily accessible.
When the Unit is in Use
• Should the following irregularity be found during
use, immediately switch off the power, disconnect
the power supply plug from the AC outlet and
contact your nearest TOA dealer. Make no further
attempt to operate the unit in this condition as this
may cause fire or electric shock.
· If you detect smoke or a strange smell coming
from the unit.
· If water or any metallic object gets into the unit
· If the unit falls, or the unit case breaks
· If the power supply cord is damaged (exposure of
the core, disconnection, etc.)
· If it is malfunctioning (no tone sounds.)
• To prevent a fire or electric shock, never open nor
remove the unit case as there are high voltage
components inside the unit. Refer all servicing to
qualified service personnel.
• Do not place cups, bowls, or other containers of
liquid or metallic objects on top of the unit. If they
accidentally spill into the unit, this may cause a fire
or electric shock.
• Do not insert nor drop metallic objects or flammable
materials in the ventilation slots of the unit's cover,
as this may result in fire or electric shock.
CAUTION
When Installing the Unit
• Never plug in nor remove the power supply plug
with wet hands, as doing so may cause electric
shock.
• When unplugging the power supply cord, be sure to
grasp the power supply plug; never pull on the cord
3
itself. Operating the unit with a damaged power
supply cord may cause a fire or electric shock.
• When moving the unit, be sure to remove its power
supply cord from the wall outlet. Moving the unit
with the power cord connected to the outlet may
cause damage to the power cord, resulting in fire or
electric shock. When removing the power cord, be
sure to hold its plug to pull.
• Avoid installing the unit in humid or dusty locations,
in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke
or steam as doing otherwise may result in fire or
electric shock.
• Be sure to follow the instructions below when rackmounting the unit. Failure to do so may cause a fire
or personal injury.
· Install the equipment rack on a stable, hard floor.
Fix it with anchor bolts or take other arrangements
to prevent it from falling down.
· When connecting the unit's power cord to an AC
outlet, use the AC outlet with current capacity
allowable to the unit.
· The supplied rack-mounting screws can be used
for the TOA equipment rack only. Do not use them
for other racks.
When the Unit is in Use
• If dust accumulates on the power supply plug or
in the wall AC outlet, a fire may result. Clean it
periodically. In addition, insert the plug in the wall
outlet securely.
• Switch off the power, and unplug the power supply
plug from the AC outlet for safety purposes when
cleaning or leaving the unit unused for 10 days or
more. Doing otherwise may cause a fire or electric
shock.
The lighting flash with arrowhead symbol, within an equilateral triangle, is intended
to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure
that may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence
of important operation and maintenance (servicing) instruction in the literature accompanying the
appliance.
L’éclair accompagné d’un symbole représentant une pointe de flèche à l’intérieur d’un triangle équilatéral
avertit l’utilisateur de la présence d’une “tension dangereuse” à l’intérieur de l’enceinte du téléviseur,
dont la magnitude peut être suffisante pour constituer un risque de choc électrique pour les personnes.
Le point d’exclamation à l’intérieur d’un triangle équilatéral avertit l’utilisateur de l’existence
d’instructions d’utilisation et d’entretien (réparation) dans la documentation fournie avec l’appareil.
3. GENERAL DESCRIPTION
The M-243 is a stereo mixer equipped with 2 monaural inputs, 4 stereo inputs, 1 stereo output, and 2 monaural
outputs. It can be mounted in an EIA component rack (1U size*).
* 1U size = 44.5 mm or 1.75" (standard size)
4
4. FEATURES
• 2 monaural inputs, 4 stereo inputs, 1 stereo output, and 2 monaural outputs. Assignable each input signal to
3 output channels individually.
• Sub-input terminals for stereo output channel and each of 2 monaural output channels.
• Microphone input or line input for monaural input selectable depending on the signal level. Built-in limiter
circuitry eliminates distortion under excessive input levels. High-pass filter as well as PAD (only for MIC input)
in the monaural line available by the internal switch settings.
• Peak indicator to detect clipping.
• An "Automatic Muting" circuit automatically mutes the stereo output signal by detecting the monaural input
signal. (ON/OFF switchable)
• A recording output and equalizer (high and low frequencies) for the stereo output channel.
• 2 channel monaural outputs usable as sum outputs for the stereo output channel individually by the internal
switch setting.
• Protective cover for protecting the setting position of each input usable as a writing plate.
• Knobs supplied in different colors and size easily replaceable depending on the intended use, improving
operability of the unit.
5. NOMENClATURE AND FUNCTIONS
[Front]
3
4
Inside of the
protective cover
8
1.Power switch
Power is switched on and off with each depression
of this switch.
2.Power indicator
Lights when the power switch is set to ON.
3.Assignment keys [ST, 1, 2]
Select one of the following output destinations
to which the post-fader input signals are routed.
Signals are output when pressed.
ST: Stereo output
1: MONO 1 output
2: MONO 2 output
4.Protective cover
Used to protect the setting position of the
assignment keys (3) from accidental operation.
It can be used as a writing plate.
5.Peak indicator
Lights when the output signal reaches 3 dB below
clipping. Be sure to adjust each input level so that
the Peak indicator does not light continuously.
5
6
9
7
10
2
1
6.Equalizer controls [EQ: LOW & HIGH]
Adjust stereo output signal tone.
LOW: ‌Low frequency adjustment (20 Hz, ±15
dB shelving)
HIGH:‌High frequency adjustment (20 kHz,
±15 dB shelving)
7.Stereo output level control
Adjusts stereo output level.
8.Input level controls [1 – 6]
(1 – 2: Monaural input, 3 – 6: Stereo input)
Adjust the input level of each channel.
9.Mute key
Activates muting when pressed. (Indicator lights.)
[Muting function]
This function works only for the stereo output
channels. Attenuates the signals applied to
Channels 3 through 6 by detecting signals applied
to Channel 1 or 2. (This function does not work for
the monaural output signal.)
10.Monaural output level controls
Adjust monaural output level.
5
[Rear]
11
12 13
14 15
18
16 17
11. AC inlet
Connect the supplied power cord.
12.Functional earth terminal
Hum noise may be generated when external
equipment is connected to the unit. Connecting
this terminal to the functional earth terminal of the
external equipment may reduce the hum noise.
Note: This terminal is not for protective earth.
13.Monaural output jacks
Function as sum output for the stereo output
channel by the internal switch setting. (Refer to
section "6. INTERNAL SWITCH SETTINGS.")
14.Stereo output jacks
19
16.Monaural sub-input terminals
Signals from these terminals are sent to each
monaural output bus (Mono 1 and Mono 2).
17.Stereo sub-input terminals
Signals from these terminals are sent to stereo
output bus. Connecting the signal to only "L"
permits it to be input to both "L" and "R."
18.Stereo input terminals (3 – 6)
Only CH6's RCA jacks are internally connected in
parallel to phone jacks.
19.Monaural input terminals (1, 2)
Select either MIC or LINE for connection. If both
are connected, LINE input takes precedence.
15.Recording output jacks
Output the signal from the stereo output bus for
recording.
6. internal switch settings
This work should only be performed by a qualified professional
electrician. If users open the unit case or modify the unit, this may
cause fire or electric shock.
WARNING
The functions below can be made available by changing the switch settings inside the unit.
(1) "PAD" switch: Set to the "IN" position to insert PAD (20 dB) in the monaural input (microphone input).
(2) "HPF" switch: Set to the "IN" position to insert High pass filter (300 Hz, –6 dB/oct) in the monaural input.
(3) ‌"GND" switch: When the unit is connected to external equipment, a ground may create a loop, potentially
generating a noise (hum). In such cases, set this switch to the LIFT position to cut off the ground loop.
(4) ‌"MONO1" and "MONO2" switches: Set to the "ST SUM" position to change each monaural output to stereo
sum output for the stereo output channel.
[Factory default setting]
STEREO BUS
L
L
R
R
MONO 1 (2)
SWITCH
MONO 1 (2)
BUS
6
[After the change]
STEREO OUT
STEREO BUS
L
L
R
R
ST SUM
MONO 1 (2)
SWITCH
MONO 1 (2)
BUS
STEREO OUT
Change in setting
MONO 1 (2) OUT
MONO 1 (2) OUT
7. BLOCK AND LEVEL DIAGRAMS
BUS
STEREO MONO
L R1 2
ASSIGN
(IN/OUT)*
LINE
–10 dB
LIMIT
CH1, CH2
(MONO INPUT)
HA
HA
L
2
VOL
MUTE
SA
CH2
MUTE
BUS
L R
HA
EBA
1
CH1
PAD
(20 dB)*
MIC
–60 dB
CH3 – CH6
(STEREO
INPUT)
–10 dB
HPF
ST
ST
ON/
OFF
SA
PAD
LA
PAD
LA
EQ
LA
MUTE
CONTROL
SA
CH6
HA
CH6
VOL
EQ
SA
SA
LOW
LA
HIGH
MONO 1
SA
ASSIGN
MONO 1*
SA
LA
1
MONO 2
MONO 2*
LA
2
MONO
OUT
+4 dB
BA
BA
POWER ON
MUTE
* INTERNAL SWITCH
BA
2
(dB)
+20
+10
0
–10
–20
–30
–40
–50
–60
ST SUM
2
SA
1
MONO
SUB INPUT
+4 dB
R
STEREO
OUT
+4 dB
PEAK
BA
STEREO MONO
SUB INPUT
+4 dB
R
L
STEREO
1
R
L REC
OUT
R -10 dB
CLIP LEVEL (+20 dB)
PEAK LED TURN ON (+17 dB)
SUB IN (+4 dB)
STEREO IN (–10 dB)
LINE (–10 dB)
(+4 dB)
(+4 dB)
STEREO OUT
MONO OUT
(-10 dB)
REC OUT
(dB)
+20
+10
0
–10
MIC/PAD
(–40 dB)
MIC
(–60 dB)
8. DIMENSIONAL DIAGRAM
301.8 (11.88)
46
(1.81)
44
(1.73)
31.8
(1.25)
7 x 10
(0.28 x 0.39)
15
(0.59)
280 (11.02)
419 (16.5)
466 (18.35)
483 (19.02)
Unit: mm (in)
7
9. SPECIFICATIONS
Power Source
Power Consumption
Monaural Input
Stereo Input (L, R)
Auxiliary Stereo Input
Stereo Output (L, R)
Monaural Output
REC Output (L, R)
Frequency Response
T.H.D.
Noise Level (IHF-A)
Finish
Dimensions
Weight
M-243 L:
120 V AC, 60 Hz
M-243 301H: 220 – 240 V AC, 50/60 Hz
M-243 L:
10 W
M-243 301H: 12 W
Line:
–10 dB*, 10 kΩ, unbalanced, phone jack
Mic:
–60 dB*, 1 kΩ, balanced, 3-pin XLR connector
Mic (Pad): –40 dB*, 1 kΩ, balanced, 3-pin XLR connector
–10 dB*, 10 kΩ, unbalanced, RCA jack
+4 dB*, 50 kΩ, unbalanced, phone jack
+4 dB*, 1 kΩ, unbalanced, phone jack
+4 dB*, 1 kΩ, unbalanced, RCA jack
–10 dB*, 1 kΩ, unbalanced, RCA jack
20 Hz – 20 kHz (+1, –2 dB)
0.01 % or less (1 kHz, rated input/output)
When all volume controls are in minimum position.
Stereo output (L, R):
–105 dB* or less
Monaural Output (1, 2): –98 dB* or less
When the stereo, monaural (1, 2) are in maximum position
Stereo output (L, R):
–94 dB* or less
Monaural Output (1, 2): –95 dB* or less
Front Panel: Alumite, black
Case:
Steel, black
483 (w) x 46 (h) x 301.8 (d) mm (19.02" x 1.81" x 11.88")
3.8 kg (8.38 lb)
* 0 dB = 0.775 Vrms
Note: The design and specifications are subject to change without notice for improvement.
• Accessories
Rack mounting screw (5 x 20) ....................
Rubber foot .................................................
Knob (blue, small) ......................................
Knob (red, small) ........................................
Knob (blue, large) .......................................
Knob (red, large) .........................................
4
4
2
2
1
1
Traceability Information for Europe
Manufacturer:
TOA Corporation
7-2-1, Minatojima-Nakamachi, Chuo-ku, Kobe, Hyogo,
Japan
Authorized representative:
TOA Electronics Europe GmbH
Suederstrasse 282, 20537 Hamburg,
Germany
URL: http://www.toa.jp/
133-02-00051-00
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