Toa MX-106 Instruction Manual

Operating Instruction Manual
TOA POWERED MIXER
Model MX-106
TOA ELECTRIC CO., LTD.
KOBE, JAPAN

Contents
General Description ......................................... 2
Features ................................................... 2
Front Panel [Na es of co ponents & their usage] .............. 3
Rear Panel [Na es of co ponents & their usage] ............... 4
Connection Exa ples ........................................ 5
Input Connections ........................................... 6
How to get a good ix ...................................... 7
Block and Level Diagra s ................................... 8
Specifications ............................................... 9
Characteristics Diagra s .................................... 10
Appearance ................................................ 10
Precautions
1. XLR Type Audio Connector
The connectors are wired as follows.
The pin 1 is ground (shield), the pin 2 cold (low, inus), the pin 3 hot (high, plus).
2. Description of co ponents and functions on the MX-106.
Various descriptions are applied, depending on each anufacturer. In our
Operating and Instruction Manual explanation of co ponents and functions is
ade according to our usage for the .
- 1 -

General Description
The MX-106 is a co pact self-powered ixer with a wide array of sophisticated
features — any of the unavailable on any co petitive odels. An exa ination of
perfor ance levels and specifications will reveal the truly professional nature of the
MX-106. The rugged construction and specialized packaging ensure opti u
perfor ance and reliability under even the ost de anding "on the road"
applications.
The MX-106 features 6 input channels; 1 progra , 1 foldback, and 1 effects output.
The internal power a plifier is rated at 120 watts into 8 oh s, 200 into 4, and 300 into
a 2 oh load.
Each input channel features an electronically balanced XLR connector, and a high
i pedance unbalanced 1/4" phone jack. An input tri control is provided to
acco odate a wide range of input source levels. A peak indicator LED detects
excessive input signal (either pre or post EQ), aiding in proper settings of the tri
control to avoid input clipping.
Each channel also features 3-band equalization, a "pre" foldback send, a "post"
effects/echo send, and progra level control.
The aster control section features a one-octave (9-band) graphic equalizer, an
analog delay, auxiliary input controls, fluorescent high-intensity bargraph output
eters, and a full patch bay with our exclusive Bus-Link capability. All aster level
controls, and effects return to progra and foldback busses are also contained in this
section.
Features
1. Six input channels
2. 300 watts RMS (@ 2 oh s)
3. 9-band graphic equalizer w/bypass switch
4. Auto Co p co pression circuitry w/indicator
5. Built-in electronic analog delay (echo)
6. High intensity fluorescent bar graph etering
Each Channel
1. Input tri control w/ LED peak indicator
2. Pre EQ foldback send
3. 3-band EQ
4. Post effects send
5. Lo-Z balanced XLR input
6. Hi-Z unbalanced 1/4" input
7. Power a p protection circuitry w/indicator
8. Co plete patch bay w/buss link
9. Aux input w/pan and level controls
10. Echo-effects return to PGM and FB
11. Independent foldback ix
- 2 -

Front Panel
Peak Indicator (PEAK)
The peak indicator lights when
the pre or post EQ signal level
reaches 3dB below clipping,
giving a visual reference for
opti u setting of the tri
control.
Foldback Control (FB)
The Foldback control deter ines
the level of signal assigned to the
foldback ixing buss, thus set-
ting the level of that channel in
the on-stage onitor ix.
High Equalizer Control
(HIGH EQ)
The high EQ control alters the
high frequency response of the
input channel, providing ±13dB
at 10kHz, and ±15dB at 20kHz of
continuously variable active
shelving equalization. The "0"
detented position provides flat
audio response.
Middle Equalizer Control
(MID EQ)
The id EQ control provides
±15dB of continuously variable
active peaking equalization at
2kHz. and has a flat audio
response when set to the "0"
detented position.
Low Equalizer Control
(LOW EQ)
The low EQ control provides
±13dB at 100Hz and ±15dB at
50Hz of continuously variable
active shelving equalization.
The "0" detented position pro-
vides flat audio response.
Echo/Effects Control
(ECHO/EFF)
This control deter ines the
level of signal assigned to the
echo effects buss. Rotating the
control clockwise increases the
a ount of echo effect in that
channel.
Input Level Control
(INPUT LEVEL)
The level control provides con-
tinuously variable adjust ent
of the channel output of the
progra ixing buss, thus deter-
ining the level of that channel
in the ain sound syste ix.
Since the echo/effects signal is
"post" this control, an increase
in the level of the channel's
output will also result in a cor-
responding increase in the echo
effect of that channel. The
no inal level of the input level
control is at the "10" position.
Input Tri Control (TRIM)
The input tri adjusts the gain
of the head-a p stage of the
associated channel, providing
39dB of gain control. When the
tri control is set to the "10"
position, the no inal input
levels of the low-Z and high-Z
inputs are —55dB and —35dB
respectively. At the "0" position
the levels are -16dB and +4dB.
The tri of each channel should
be adjusted so that the peak LED
just begins to light, or only
flashes occasionally. This will
ensure lowest distortion levels
and opti u signal to noise
ratio.
Foldback Master Control (FB)
The FB aster control adjusts
the overall co bined signal
level of the six independent
channel foldback sends, and
thus the level of the entire on-
stage onitor ix.
Echo/Effects to Foldback
Control (ECHO/EFF TO FB)
This control adjusts the a ount
of echo/effects signal that is
returned to the foldback buss
and thus the level of echo/effects
contained in the on-stage oni-
tor ix.
Low I pedance Connectors
(LOW Z)
The XLR connectors are low
i pedance, electronically bal-
anced inputs with an input
i pedance of 1k oh s.
High I pedance Connectors
(HIGH Z)
These connectors are unba-
lanced, standard 1/4" phone
jacks with an input i pedance
of 50k oh s, and an input level
of —35dB when the tri control
is set t o "10". When a plug is
inserted into the high —Z input,
the corresponding XLR connec-
tor is auto atically switched
out of the input circuitry.
Progra Master Control
(PGM)
The PGM control adjusts the
overall co bined signal level of
the six independent channel
level controls, and thus the level
of the ain sound syste .
Echo/Effects to Progra
Control (ECHO/EFF TO PGM)
This control adjusts the a ount
of echo/effects signal that is
returned to the progra buss
and thus the level of echo/effects
contained in the ain sound
syste .
Aux Level Control (AUX)
This control sets the overall
level of the Aux input signal.
Patching Jack
(PATCH BAY/IN)
Patching Jack
(PATCH BAY/OUT)
Aux Panpot (AUX PAN)
This control assigns the auxili-
ary input signal (a tapedeck,
etc., connected to the aux input
jacks) to either the progra or
the foldback ixing busses. At
the center position, the signal is
routed equally to both busses.
Panning fro one side to the
other gradually assigns the sig-
nal to either independently.
Power A p Co pression
Indicator (COMP)
The Co p LED lights when the
internal co pressor is acti-
vated. The co pressor is
provided to protect speaker
syste s by co pressing the
input signal level of the power
a plifier when clipping occurs
in the output stage. Frequent
flashing of the LED is not reason
for alar . However, a constant
or steady light indicates that the
MX-106 is being overdriven and
that the internal power a plifier
is possibily "under powered" for
that application. The output
level of the MX-106 should be
decreased until the LED only
flashes inter ittently.
Echo/Effects Send Control
(ECHO/EFF SEND)
This control adjusts the overall
signal level of the effects ix
that is delivered to the internal
echo unit, or to an external
effects device through the ef-
fects output. The send control
works in conjunction with the
Echo/EFF to PGM and the
Echo/EFF to FB controls to set
the overall level of echo/effects
in the ain and onitor sound
syste s.
Delay Ti e Control
(T1 DELAY)
The Tl control per its continu-
ously variable adjust ent of the
echo ti e, fro 10 seconds
(SHORT) to 100 seconds
(LONG).
Regeneration Control
(T2 REGEN)
The T2 control deter ines the
nu ber of "repeats" of the
delayed signal fro the internal
echo unit.
Graphic Equalizer
(EQUALIZATION)
The graphic equalizer is 1/1
octave with 9 independent ac-
tive bands (filters), providing
12dB of boost or cut at each
center frequency. The "0" de-
tented position provides flat
audio response.
Graphic Equalizer In/Out
Switch (IN/OUT)
The in/out switch enables co -
parison between a flat response
(out) and the equalized response
(in). The "out" position co -
pletely re oves the equalizer
fro the MX-106 circuitry.
Fluorescent Bargraph Peak
Meters (PGM/FB)
The high intensity eters enable
visual onitoring of the pro-
gra and foldback output signal
levels.
Power A p Protection
Indicator (PROTECT)
The indicator LED lights if the
power a plifier output is short-
ed, if the te perature of the unit
rises above acceptable levels, or
if DC is drifted to the speaker
outputs. If the LED should light,
speaker wiring and a bient
te perature of the MX-106
should be checked. If the LED
re ains lighted, the unit should
be referred to qualified service
personnel for repair.
Note:
The MX-106 protection circuitry
will (1) detect 'faulty conditions'
within the power a plifier, (2)
give a visual indication, and (3)
auto atically shut down until
the fault condition is alleviated.
This special circuitry ensures
axi u reliability and virtu-
ally eli inates equip ent da -
age due to unsafe or fault
conditions. Please refer to fault
protection table on page 7 for
full explanation of this i por-
tant feature.
- 3 -
Buss Link Jack
(BUSS LINK)

Front Panel, Patch Bay & Buss Link
Power A plifier Input Jack
(PWR AMP)
The PWR A p input jack allows
the internal power a plifier to
be used with external equip-
ent. When a plug is inserted,
the power a p is auto atically
disconnected fro the MX-106
ixer section. The no inal
input level is +4dB with an
input i pedance of 10k oh s.
Progra Output Jack
(PGM OUT)
The PGM Out jack is provided
for connection to external equal-
izers and/or power a ps, deriv-
ing its signal prior to the internal
GEQ and power a p. No inal
output level is +4dB with an
i pedance of 600 oh s.
Effects Output Jack (EFF OUT)
The EFF Out jack used in
conjunction with the EFF/RET
Jack allows use of an external
effects device in place of the
internal analog echo unit. The
effects out jack should be con-
nected to the input of the
external effect unit. No inal
output level is —10dB with an
i pedance of 600 oh s.
Effects Return Jack (EFF /RET)
The EFF/Ret jack is provided to
connect an external effects de-
vice to the MX-106. When a plug
is inserted the internal echo unit
is auto atically switched out of
the MX-106 circuitry, being
replaced by the external unit.
This jack should be connected to
the output of the external effects
unit. No inal input level is
—20dB with an i pedance of 50k
oh s.
Graphic Equalizer Input Jack
(GEQ)
The GEQ input jack allows the
graphic equalizer to be used
independently of the MX-106
with other external equip ent,
or the internal power a plifier
and the graphic equalizer with
external equip ent. When a
plug is inserted, the ain ix
fro the progra buss is dis-
connected fro the graphic
equalizer and the power a pli-
fier. The no inal input level is
+4dB with an input i pedance
of 50k oh s.
Graphic Equalizer Output Jack
(GEQ OUT)
This jack allows the MX-106
and the internal graphic equal-
izer to be used with an external
power a plifier, or in conjunc-
tion with the GEQ in jack, to be
used independently of all other
MX-106 circuitry. No inal out-
put level is +4dB with an
i pedance of 600 oh s
Foldback Output Jack
(FB OUT)
This jack is for connection to
external power a plifiers and/
or equalizers for the on-stage
onitoring syste . No inal
output level is +4dB with an
i pedance of 600 oh s. If the
internal power a p and equal-
izer are to be used for the on-
stage onitor syste , the FB
output should be connected to
the GEQ input jack.
AUX 1, AUX 2 Input Jack
(AUX 1, AUX 2)
-20dB 10k
Progra Buss Link Jack
(PGM) +4dB 22k
Fold Back Buss Link (FB)
+4dB 22k
Echo/Effects Buss Link Jack
(EFF) +4dB 22k
Buss Link Jacks
The buss link provides direct
access to the PGM, FB, and
effects ixing busses, and is
provided for easy input ex-
pansion with additional MX-
106 units or other auxiliary
equip ent. All jacks have an
input level of +4dB with an
i pedance of 22k oh s.
Recording Output Jack
(REC OUT)
The Rec Out jack obtains its
signal prior to the progra
aster output, and is intended
for connection to external re-
cording equip ent. No inal
output level is —10dB with an
i pedance of 1k oh s.
Rear Panel
Power Switch (POWER)
The power switch is a three-
position type with the iddle
position being the "off position.
The MX-106 should be operated
in the switch position which
produces the lowest a ount of
syste hu .
Speaker Jacks (SPEAKERS)
The speaker outputs are stan-
dard 1/4" phone jacks wired in
parallel. Speaker cables (reco -
end at least #18 gauge wire)
should be connected between
the MX-106 and the speaker
syste s prior to applying power
to the unit.
Caution - The MX-106 should
never be operated into less than
a 2 oh speaker load.
AC Power Cord
The power cord is the three-wire
type with proper grounding
facilities.
Caution - The ground pin should
not be re oved under any
circu stances. If the MX-106
ust be used without proper
grounding facilities, a suitable
grounding adapter should be
utilized. Operation of the Mx-
106 with proper grounding tech-
niques will result in less syste
noise and greatly reduced shock
hazard.
AC Fuse
The proper fuse rating for 110-
120V AC operation of the MX-
106 is 7 a ps.
Warning - To avoid possible
equip ent da age and/or per-
sonnel injury, the fuse should
always be replaced with sa e
type and rating. Using i proper
fuses will also void the war-
Cord Wrap
The cord wrap is provided for
convenient storage of the power
cord when the MX-106 is not in
use.
Caution - The power cord should
always be co pletely re oved
fro the cord wrap prior to
operation of the unit. This will
insure axi u cooling of the
MX-106. For the sa e reason,
adequate clearance should be
aintained between the rear
panel and any other surface (4-6
inches should do). The vents on
the botto and top of the MX-
106 are also provided for con-
vection cooling. These vents
should be kept clear and open.
Failure to do so ay cause
ther al shut-down of the unit.
ranty. The MX-106 should al-
ways be disconnected fro AC
outlet prior to changing fuses. If
fuse repeatedly fails, the unit
should be referred to qualified
service personnel for repair.
Earth Ter inal (GND)
- 4 -

Connection Exa ples
Low Z input should be connected
with low i pedance (50 oh ~ 600 oh )
icrophones
SUB MIXER (MX-106)
Built in Power
A plifier for
Foldback
MUSICAL INSTRUMENT
MAIN SPEAKER SYSTEM
SPEAKER SYSTEM
for foldback
Fro Speaker Jack
on Rear Panel
MAIN MIXER (MX-106)
WIRELESS TUNER
SUCH AS WT-02,
WT-06
KEYBOARD
Line Out
Fro Speaker Jack
on Rear Panel
CASSETTE TAPE DECK
for recording
Line Out
- 5 -

Input Connections
Generally speaking, there are two rules to follow when connecting equip ent outputs
to the inputs of other equip ent.
1. Properly atch the i pedances of the outputs and inputs.
2. Connect low i pedance outputs to high i pedance inputs.
It goes without saying that not only input and output i pedance atching but also
level atching should be taken into consideration. Each input channel of the MX-106
is provided with an input TRIM control, so the usable signal level range is very wide.
Input i pedances and levels are shown in the following table.
INPUT SPECIFICATIONS
CONNECTION
CH1
CH6
AUX (1~2)
EFF/RET
GEQ
PWR/AMP
INPUT
LOW Z
HIGH Z
ACTUAL
LOAD
IMPEDANCE
OPEN
50k
10k
50k
50k
10k
FOR USE
WITH
NOMINAL
50 TO 250
MICRO-
PHONES
50k OR
LOWER IMP
LINES
10k OR
LOWER IMP,
LINES
50k OR
LOWER IMP,
LINES
50k OR
LOWER IMP,
LINES
10k OR
LOWER IMP
TRIM
POSI-
TION
10
0
10
0
SENSITIVITY
(PGM OUTPUT
LEVEL +4dB )
-55dB (1.38 V)
-16dB (123 V)
-35dB (13.8 V)
+4dB (1.23V)
-20dB (77.5 V)
-20dB (77.5 V)
+4dB (1.23V)
+4dB (1.23V)
MAX BEFORE
CLIP INPUT
LEVEL
-34dB (15 V)
+1.7dB (0.94V)
-14dB (150 V)
+20dB (7.75V)
-2dB (0.61V)
-2dB (0.61V)
CONNECTOR
XLR TYPE NC3F
PHONE JACK
PHONE JACK
PHONE JACK
PHONE JACK
PHONE JACK
*Sensitivity is the level required to produce a progra out level of +4dB .
*0dB is referenced to 0.775V RMS.
All XLR Type connectors are electronic balanced. Phone jack is unbalanced.
If the line going fro one piece of equip ent to another is long ( ore than 5 ), we
reco end that balanced outputs be connected to balanced inputs.
As is described in the beginning of the Operating Instructions Manual, the connectors
of the MX-106 are wired as follows: Pin 1 is ground (shield). Pin 2 is cold (low, inus).
Pin 3 is hot (high, plus).
- 6 -

How to get a good ix
Before connecting other equip ent to the Powered ixer, check the i pedance and
level of both. If the i pedances and levels do not atch, ixing will be very difficult
and the S/N ratio will also be adversely affected.
Each input channel of the MX-106 is provided with a TRIM control. Thorough
understanding of the function of a TRIM control will ake ixing easier.
Tri Control
Input
The function of the TRIM control is to
control the negative feedback volu e of the
head-a p so that the gain of the head-a p
can also be changed. Bacause of this, enough
dyna ic range, even for high level signals is
ensured. Also, the S/N ratio will be better by
decreasing the gain of the head-a p.
For exa ple, a keyboard, a usical instru ent and a dyna ic icrophone with
output levels of –10dB , –20dB and –40dB respectively are connected to the MX-
106.
If the tri control is set as shown in the left
figure, the input level controls can be set to
the sa e position.
The input level controls are used in general
between 6 and 8.
The peak indicator LED illu inates if the
head a plifier or equalizer is clipping. The
gain of the head-a plifier ust be decreased
by turning the tri control counterclock-
wise.
Key Board in
-10dB level
Musical Instru ent in
20dB level
Dyna ic
Microphone in
-40dB level
Fault Protection Table
Fault
Excessive current due to
overloads.
Short circuits
(less than 0.4-oh )
Te perature rise of heat
sink
( ore than 105°C)
DC drift
Protection
Current li iter activates at
less than 1 oh .
Current li iter activates,
input signal is lowered,
unit shuts down,
Input signal is lowered.
Unit shuts down.
Input signal is lowered.
Unit shuts down.
Indication
Co pressor
LED illu inates.
A p protection
LED illu inates.
A p protection
LED illu inates.
A p protection
LED illu inates.
Action
Re ove excessive lords.
Mini u speaker loads 2-
oh .
Check speaker
lines/syste s for shorts.
Check for adequate
ventilation.
Refer to qualified service
personnel.
Restoration
Auto atic restoration
after nor al loads are
obtained.
Turn off power switch.
Turn on into operational
loads.
Auto atic restoration
after te perature
lowers (to 75° - 95° C)
Auto atic restoration
after nor al bias is
regained.
Output
– 7 –

Block and Level Diagra s
BLOCK DIAGRAMS
LEVEL DIAGRAM
- 8 -

Specifications
–130dB (20Hz ~ 20kHz)
–133dB (IHF A)
–102dB (IHF A)
–93dB (IHF A)
–72dB (IHF A)
Frequency Response
+0, -3dB 30Hz~20kHz (HIGH Zinput TRIM at "0" position.)
Equalization
63Hz ±12dB Peaking
125Hz ±12dB Peaking
250kHz +12dB Peaking
500Hz ±12dB Peaking
1kHz +12dB Peaking
2kHz ±12dB Peaking
4kHz ±12dB Peaking
8kHz ±12dB Peaking
16kHz ±12dB Peaking
Peak Indicators
Red LED on each input channel LED's turn on at 3dB below
clipping.
INPUT SPECIFICATIONS
CONNECTION
CH1
CH6
AUX (1~2)
EFF/RET
GEQ
PWR/AMP
INPUT
LOW Z
HIGH Z
——
——
——
——
ACTUAL
LOAD
IMPEDANCE
OPEN
50k
10k
50k
50k
10k
FOR USE
WITH
NOMINAL
50 TO 250
MICRO-
PHONES
50k OR
LOWER IMP
LINES
10k OR
LOWER IMP,
LINES
50k OR
LOWER IMP,
LINES
50k OR
LOWER IMP,
LINES
10k OR
LOWER IMP
TRIM
POSI-
TION
10
0
10
0
SENSITIVITY
(PGM OUTPUT
LEVEL +4dB )
-55dB (1.38 V)
-16dB (123 V)
-35dB (13.8 V)
+4dB (1.23V)
-20dB (77.5 V]
-20dB (77.5 V]
+4dB (1.23V)
+4dB (1.23V)
MAX BEFORE
CLIP INPUT
LEVEL
-34dB (15 V)
+1.7dB (0.94V)
-14dB (150 V)
+20dB (7.75V)
-2dB (0.61V)
-2dB (0.61V)
CONNECTOR
XLR TYPE NC3F
PHONE JACK
PHONE JACK
PHONE JACK
PHONE JACK
PHONE JACK
OUTPUT SPECIFICATIONS
CONNECTION
PGM
EFF
GEQ
FB
REC
ACTUAL LOAD
IMPEDANCE
600
600
600
600
1k
FOR USE WITH
NOMINAL
600 OR HIGHER
IMP. LINES
600 OR HIGHER
IMP. LINES
600 OR HIGHER
IMP. LINES
600 OR HIGHER
IMP. LINES
1k OR HIGHER
IMP. LINES
OUTPUT LEVEL
NOMINAL
+4dB (1.23V)
-10dB (245 V)
+4dB (1.23V)
+4dB (1.23V)
-10dB (245 V)
MAX. BEFORE
CLIP
+20dB (7.75V)
+8dB (1.9V)
+20dB (7.75V)
+20dB (7.75V)
+8dB (1.9V)
CONNECTOR
PHONE JACK
PHONE JACK
PHONE JACK
PHONE JACK
PHONE JACK
POWER AMPLIFIER SECTION
Frequency Response
+0, -1dB 5Hz to 40kHz (200W RMS 4 )
Rated Power & Load
300W RMS (2 ) 200W RMS (4 ) 120W RMS (8 )
Power Output at Clipping
1% THD, 1kHz
348W RMS (2 ) 238W RMS (4 ) 140W RMS (8 )
Total Har onic Distortion
Less than 0.1% (200 W~200W RMS, 20Hz~20kHz)
Typically below 0.05%
Co presser Dyna ic Range
Greater than 26dB
Hu and Noise
At least 110dB S/N ratio, 20Hz~20kHz
At least 113dB S/N ratio IHF-A weighted
Da ping Factor
Greater than 200 (1kHz 4 )
Input Sensitivity
+4dB (1.23V)
Input I pedance
10k
Output Connector
Phone Jack×2
Power Require ent
600 W 120V AC 50/60Hz
Di ensions
585(W)×333(H)×302(D) (23.03×13.11×11.89) inch
Weight
20.3 kg (44.75 lbs)
*0dBrn is referenced to 0.775V RMS.
*Specifications are subject to change without notice.
MIXER SECTION
Total Har onic Distortion
0.05% +4dB at 1kHz.
Hu and Noise (Open)
Equivalent Input Noise
Equivalent Input Noise
All level Controls Mini u
PGM Master at MAX and all
input level controls ini u
PGM Master at MAX and one
input level control at MAX
Maxi u Voltage Gain
INPUT to PGM out
INPUT to EFF out
INPUT to FB out
INPUT to REC out
INPUT to GEQ out
AUX to PGM out
EFF/RET to PGM out
59dB
45dB
59dB
45dB
59dB
24dB
24dB
- 9 -

Characteristics Diagra s
HIGH Z IN. TRIM/MIN. & INPUT EQ
GEQ
POWER AMP POWER BAND WIDTH
POWER AMP TOTAL HARMONIC DISTORTION
POWER AMP COMPRESSOR
Appearance
- 10 -

Printed in Japan
133-02-575-80
TOA ELECTRIC CO., LTD.
KOBE, JAPAN