Toa MX-106R Instruction Manual

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

General Description
Features
Front Panel [Names o components & their usage]
Rear Panel [Names o components & their usage]
Connection Examples
Input Connections
How to get a good mix
Block and Level Diagrams
Speci ications
Characteristics Diagrams
Appearance
2
2
3
4
5
6
7
8
9
10
10
1. XLR Type Audio Connector
The connectors are wired as ollows.
The pin 1 is ground (shield), the pin 2 cold (low, minus), the pin 3 hot (high, plus).
2. Description of components nd functions on the MX-106R.
Various descriptions are applied, depending on each manu acturer. In our
Operating and Instruction Manual explanation o components and unctions is
made according to our usage or them.
— 1 —
Contents
Prec utions

The MX-106R is a compact sel -powered mixer with a wide array o sophisticated
eatures — many o them unavailable on any competitive models. An examination o
per ormance levels and speci ications will reveal the truly pro essional nature o the
MX-106R. The rugged construction and specialized packaging ensure optimum
per ormance and reliability under even the most demanding "on the road"
applications.
The MX-106R eatures 6 input channels; 1 program, 1 oldback, and 1 e ects output.
The internal power ampli ier is rated at 120 watts into 8 ohms, 200 into 4, and 300 into
a 2 ohm load.
Each input channel eatures an electronically balanced XLR connector, and a high
impedance unbalanced 1/4" phone jack. An input trim control is provided to
accommodate a wide range o input source levels. A peak indicator LED detects
excessive input signal (either pre or post EQ), aiding in proper settings o the trim
control to avoid input clipping.
Each channel also eatures 3-band equalization, a "pre" oldback send, a "post"
reverb/e ects send, and program level control.
The master control section eatures a one-octave (9-band) graphic equalizer, high and
low equalizer control o an internal reverberation unit, auxiliary input controls,
luorescent high-intensity bargraph output meters, and a ull patch bay with our
exclusive Bus-Link capability. All master level controls, and e ects return to program
and oldback busses are also contained in this section.
1. Six input channels
2. 300 watts RMS (@ 2 ohms)
3. 9-band graphic equalizer w/bypass switch
4. Auto Comp compression circuitry w/indicator
5. Built-in spring reverberation unit
6. High intensity luorescent bar graph metering
7. Power amp protection circuitry w/indicator
8. Complete patch bay w/buss link
9. Aux input w/pan and level controls
10. Reverb-e ects return to PGM and FB
11. Independent oldback mix
E ch Ch nnel
1. Input trim control w/ LED peak indicator
2. Pre EQ oldback send
3. 3-band EQ
4. Post e ects send
5. Lo-Z balanced XLR input
6. Hi-Z unbalanced 1/4" input
— 2 —
Gener l Description
Fe tures

Pe k Indic tor (PEAK)
The peak indicator lights when
the pre or post EQ signal level
reaches 3dB below clipping,
giving a visual re erence or
optimum setting o the trim con-
trol.
Foldb ck Control (FB)
The Foldback control deter-
mines the level o signal assign-
ed to the oldback mixing buss,
thus setting the level o that
channel in the on-stage monitor
mix.
High Equ lizer Control
(HIGH EQ)
The high EQ control alters the
high requency response o the
input channel, providing ±13dB
at 10kHz, and ±15dB at 20kHz o
continuously variable active
shelving equalization. The "0"
detented position provides lat
audio response.
Middle Equ lizer Control
(MID EQ)
The mid EQ control provides
±15dB o continuously variable
active peaking equalization at
2kHz. and has a lat audio re-
sponse when set to the "0"
detented position.
Low Equ lizer Control
(LOW EQ)
The low EQ control provides
±13dB at 100Hz and ±15dB at
50Hz o continuously variable
active shelving equalization.
The "0" detented position pro-
vides lat audio response.
Reverb/Effects Control
(REV/EFF)
This control determines the
level o signal assigned to the re-
verb e ects buss. Rotating the
control clockwise increases the
amount o reverb e ect in that
channel.
Input Level Control
(INPUT LEVEL)
The level control provides con-
tinuously variable adjustment
o the channel output to the
program mixing buss, thus deter-
mining the level o that channel
in the main sound system mix.
Since the reverb/e ects signal is
"post" this control, an increase
in the level o the channel's out-
put will also result in a cor-
responding increase in the re-
verb e ect o that channel. The
nominal level o the input level
control is at the "10" position.
Low Imped nce Connectors
(LOW Z)
The XLR connectors are low im-
pedance, electronically balanced
inputs with an input impedance
o 1k ohms.
Input Trim Control (TRIM)
The input trim adjusts the gain
o the head-amp stage o the as-
sociated channel, providing
39dB o gain control. When the
trim control is set to the "10"
position, the nominal input
levels o the low-Z and high-Z
inputs are –55dB and –35dB re-
spectively. At the "0" position
the levels are –16dB and +4dB.
The trim o each channel should
be adjusted so that the peak LED
just begins to light, or only
lashes occasionally. This will
ensure lowest distortion levels
and optimum signal to noise
ratio.
Foldb ck M ster Control (FB)
The FB master control adjusts
the overall combined signal
level o the six independent
channel oldback sends, and
thus the level o the entire on-
stage monitor mix.
Reverb/Effects to Foldb ck
Control (REV/EFF TO FB)
This control adjusts the amount
o reverb/e ects signal that is
returned to the oldback buss
and thus the level o reverb/
e ects contained in the on-stage
monitor mix.
Gr phic Equ lizer
(EQUALIZATION)
The graphic equalizer is 1/1
octave with 9 independent ac-
tive bands ( ilters), providing
12dB o boost or cut at each
center requency. The "0" de-
tented position provides lat
audio response.
High Imped nce Connectors
(HIGH Z)
These connectors are unbal-
anced, standard 1/4" phone
jacks with an input impedance
o 50k ohms, and an input level
o –35dB when the trim control
is set t o "10". Whe n a plug is in-
serted into the high –Z input, the
corresponding XLR connector is
automatically switched out o
the input circuitry.
Progr m M ster Control
(PGM)
The PGM control adjusts the
overall combined signal level o
the six independent channel
level controls, and thus the level
o the main sound system.
Reverb/Effects to Progr m
Control
(REV/EFF TO PGM)
This control adjusts the amount
o reverb/e ects signal that is
returned to the program buss
and thus the level o reverb/
e ects contained in the main
sound system.
Aux Level Control (AUX)
This control sets the overall
level o the Aux input signal.
Buss Link J ck
(BUSS LINK)
P tching J ck
(PATCH BAY/IN)
P tching J ck
(PATCH BAY/OUT)
Aux P npot (AUX PAN)
This control assigns the aux-
iliary input signal (a tapedeck,
etc., connected to the aux input
jacks) to either the program or
the oldback mixing busses. At
the center position, the signal is
routed equally to both busses.
Panning rom one side to the
other gradually assigns the
signal to either independently.
Power Amp Compression
Indic tor (COMP)
The Comp LED lights when the
internal compressor is acti-
vated. The compressor is pro-
vided to protect speaker systems
by compressing the input signal
level o the power ampli ier
when clipping occurs in the out-
put stage. Frequent lashing o
the LED is not reason or alarm.
However, a constant or steady
light indicates that the MX-106R
is being overdriven and that the
internal power ampli ier is
possibily "under powered" or
that application. The output
level o the MX-106R should be
decreased until the LED only
lashes intermittently.
Reverb/Effects Send Control
(REV/EFF SEND)
This control adjusts the overall
signal level o the e ects mix
that is delivered to the internal
reverberation unit, or to an
external e ects device through
the e ects output. The send con-
trol works in conjunction with
the REV/EFF to PGM and the
REV/EFF to FB controls to set
the overall level o reverb/
e ects in the main and monitor
sound systems.
Reverber tion Low Equ lizer
Control
(REV LOW EQ)
The low EQ control alters the
low requency response o the
reverberation signal. The "0" de-
tented position provides lat
audio response.
Reverber tion High Equ lizer
Control
(REV HIGH EQ)
The high EQ control alters the
high requency response o the
reverberation signal. The "0" de-
tented position provides lat
audio response.
Gr phic Equ lizer In/Out
Switch (IN/OUT)
The in/out switch enables com-
parison between a lat response
(out) and the equalized response
(in). The "out" position com-
pletely removes the equalizer
rom the MX-106R circuitry.
Fluorescent B rgr ph Pe k
Meters (PGM/FB)
The high intensity meters enable
visual monitoring o the pro-
gram and oldback output signal
levels.
Power Amp Protection
Indic tor (PROTECT)
The indicator LED lights i the
power ampli ier output is short-
ed, i the temperature o the unit
rises above acceptable levels, or
i DC is dri ted to the speaker
outputs. I the LED should light,
speaker wiring and ambient
temperature o the MX-106R
should be checked. I the LED
remains lighted, the unit should
be re erred to quali ied service
personnel or repair.
Note:
The MX-106R protection cir-
cuitry will (1) detect ' aulty con-
ditions' within the power amp-
li ier, (2) give a visual indica-
tion, and (3) automatically shut
down until the ault condition is
alleviated. This special circuitry
ensures maximum reliability
and virtually eliminates equip-
ment damage due to unsa e or
ault conditions. Please re er to
ault protection table on page 7
or ull explanation o this
important eature.
— 3 —
Front P nel

Power Amplifier Input J ck
(PWR AMP)
The PWR Amp input jack allows
the internal power ampli ier to
be used with external equip-
ment. When a plug is inserted,
the power amp is automatically
disconnected rom the MX-106R
mixer section. The nominal in-
put level is +4dB with an input
impedance o 10k ohms.
Progr m Output J ck
(PGM OUT)
The PGM Out jack is provided
or connection to external equal-
izers and/or power amps, deriv-
ing its signal prior to the internal
GEQ and power amp. Nominal
output level is +4dB with an
impedance o 600 ohms.
Effects Output J ck (EFF OUT)
The EFF Out jack used in con-
junction with the EFF/RET Jack
allows use o an external e ects
device in place o the internal
reverberation unit. The e ects
out jack should be connected to
the input o the external e ect
unit. Nominal output level is
–10dB with an impedance o 600
ohms.
Effects Return J ck (EFF/RET)
The EFF/RET jack is provided to
connect an external e ects
device to the MX-106R. When a
plug is inserted the internal
reverberation unit is automati-
cally switched out o the MX-
106R circuitry, being replaced
by the external unit. This jack
should be connected to the out-
put o the external e ects unit.
Nominal input level is –20dB
with an impedance o 50k ohms.
Gr phic Equ lizer Input J ck
(GEQ)
The GEQ input jack allows the
graphic equalizer to be used in-
dependently o the MX-106R
with other external equipment,
or the internal power ampli ier
and the graphic equalizer with
external equipment. When a
plug is inserted, the main mix
rom the program buss is discon-
nected rom the graphic equal-
izer and the power ampli ier.
The nominal input level is +4dB
with an input impedance o 50k
ohms.
Gr phic Equ lizer Output J ck
(GEQ OUT)
This jack allows the MX-106R
and the internal graphic equal-
izer to be used with an external
power ampli ier, or in conjunc-
tion with the GEQ in jack, to be
used independently o all other
MX-106R circuitry. Nominal
output level is +4dB with an
impedance o 600 ohms
Foldb ck Output J ck
(FB OUT)
This jack is or connection to
external power ampli iers and/
or equalizers or the on-stage
monitoring system. Nominal
output level is +4dB with an
impedance o 600 ohms. I the
internal power amp and equal-
izer are to be used or the on-
stage monitor system, the FB
output should be connected to
the GEQ input jack.
AUX 1, AUX 2 Input J ck
(AUX 1, AUX 2)
–20dB 10k
Progr m Buss Link J ck
(PGM) (+4dB 22k
Fold B ck Buss Link (FB)
(+4dB 22k
Reverb/Effects Buss Link J ck
(EFF) +4dB 22k
Buss Link J cks
The buss link provides direct
access to the PGM, FB, and e -
ects mixing busses, and is pro-
vided or easy input expansion
with additional MX-106R units
or other auxiliary equipment.
All jacks have an input level o
+4dB with an impedance o 22k
ohms.
Recording Output J ck
(REC OUT)
The Rec Out jack obtains its
signal prior to the program
master output, and is intended
or connection to external
recording equipment. Nominal
output level is –10dB with an
impedance o 1k ohms.
Power Switch (POWER)
The power switch is a three-
position type with the middle
position being the "o " position.
The MX-106R should be operat-
ed in the switch position which
produces the lowest amount o
system hum.
Spe ker J cks (SPEAKERS)
The speaker outputs are stand-
ard 1/4" phone jacks wired in
parallel. Speaker cables (recom-
mend at least #18 gauge wire)
should be connected between
the MX-106R and the speaker
systems prior to applying power
to the unit.
C ution - The MX-106R should
never be operated into less than
a 2 ohm speaker load.
AC Power Cord
The power cord is the three-wire
type with proper grounding aci-
lities.
C ution - The ground pin should
not be removed under any cir-
cumstances. I the MX-106R
must be used without proper
grounding acilities, a suitable
grounding adapter should be
utilized. Operation o the MX-
106R with proper grounding
techniques will result in less
system noise and greatly reduc-
ed shock hazard.
Cord Wr p
The cord wrap is provided or
convenient storage o the power
cord when the MX-106R is not in
use.
C ution - The power cord should
always be completely removed
rom the cord wrap prior to
operation o the unit. This will
insure maximum cooling o the
MX-106R. For the same reason,
adequate clearance should be
maintained between the rear
panel and any other sur ace (4-6
inches should do). The vents on
the b ottom and top o the MX-
106R are also provided or con-
vection cooling. These vents
should be kept clear and open.
Failure to do so may cause
thermal shut-down o the unit.
E rth Termin l (GND)
AC Fuse
W rning - To avoid possible
equipment damage and/or per-
sonnel injury, the use should
always be replaced with same
type and rating. Using improper
uses will also void the warran-
ty. The MX-106R should always
be disconnected rom AC outlet
prior to changing uses. I use
repeatedly ails, the unit should
be re erred to quali ied service
personnel or repair.
— 4 —
)
Front P nel, P tch B y & Buss Link
Re r P nel

Low Z input should be connected
with low impedance (50 ohm ~ 600 ohm)
microphones
SUB MIXER (MX-106R)
Built in Power
Ampli ier or
Foldback
From Speaker Jack
on Rear Panel
MAIN MIXER (MX-106R)
WIRELESS TUNER
SUCH AS WT-02,
WT-06
KEYBOARD
Line Out
Line Out
MUSICAL INSTRUMENT
From Speaker Jack
on Rear Panel
CASSETTE TAPE DECK
or recording
MAIN SPEAKER SYSTEM SPEAKER SYSTEM
or oldback
- 5 -
Connection Ex mples

Generally speaking, there are two rules to ollow when connecting equipment outputs
to the inputs o other equipment.
1. Properly match the impedances o the outputs and inputs.
2. Connect low impedance outputs to high impedance inputs.
It goes without saying that not only input and output impedance matching but also
level matching should be taken into consideration. Each input channel o the MX-
106R is provided with an input TRIM control, so the usable signal level range is very
wide. Input impedances and levels are shown in the ollowing table.
INPUT SPECIFICATIONS
CONNECTION
CH1
CH6
AUX (1~2)
EFF/RET
GEQ
PWR/AMP
INPUT
LOW Z
HIGH Z
ACTUAL
LOAD
IMPEDANCE
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)
-55dBm (1.38mV)
-16dBm (123mV)
-35dBm (13.8mV)
-4dBm (1.23mV)
-20dBm (77.5mV)
+20dBm (77.5mV)
+4dBm (1.23V)
+4dBm (1.23V)
MAX BEFORE
CLIP INPUT
LEVEL
-34dBm (15mV)
+1.7dB (0.94V)
-14dBm (150mV)
+20dB (7.75V)
-2dBm (0.61V)
-2dBm (0.61V)
CONNECTOR
XLR TYPE NC3F
PHONE JACK
PHONE JACK
PHONE JACK
PHONE JACK
PHONE JACK
*Sensitivity is the level required to produce a program out level o +4dBm.
*0dBm is re erenced to 0.775V RMS.
All XLR Type connectors are electronic balanced. Phone jack is unbalanced.
I the line going rom one piece o equipment to another is long (more than 5m), we
recommend that balanced outputs be connected to balanced inputs.
As is described in the beginning o the Operating Instructions Manual, the connectors
o the MX-106R are wired as ollows: Pin 1 is ground (shield). Pin 2 is cold (low,
minus). Pin 3 is hot (high, plus).
— 6 —
Input Connections

Be ore connecting other equipment to the Powered mixer, check the impedance and
level o both. I the impedances and levels do not match, mixing will be very di icult
and the S/N ratio will also be adversely a ected.
Each input channel o the MX-106R is provided with a TRIM control. Thorough
understanding o the unction o a TRIM control will make mixing easier.
The unction o the TRIM control is to
control the negative eedback volume o the
head-amp so that the gain o the head-amp
can also be changed. Because o this, enough
dynamic range, even or high level signals is
ensured. Also, the S/N ratio will be better by
decreasing the gain o the head-amp.
For example, a keyboard, a musical instrument and a dynamic microphone with
output levels o –10dBm, –20dBm and –40dBm respectively are connected to the MX-
106R.
I the trim control is set as shown in the le t
igure, the input level controls can be set to
the same position.
The input level controls are used in general
between 6 and 8.
The peak indicator LED illuminates i the
head ampli ier or equalizer is clipping. The
gain o the head-ampli ier must be
decreased by turning the trim control
counterclockwise.
F ult Protection T ble
Trim Control
Input
HEAD AMP
Output
Key Bo rd in
–10dBm level
Music l Instrument in
–20dBm level
Dyn mic
Microphone in
–40dBm level
Fault
Excessive current due to
overloads.
Short circuits
(less than 0.4-ohm)
Temperature rise o heat
sink
(more than 105° C)
DC dri t
Protection
Current limiter activates at
less than 1 ohm.
Current limiter activates,
input signal is lowered,
unit shuts down.
Input signal is lowered.
Unit shuts down.
Input signal is lowered.
Unit shuts down.
Indication
Compressor
LED illuminates.
Amp protection
LED illuminates.
Amp protection
LED illuminates.
Amp protection
LED illuminates.
Action
Remove excessive lords.
Minimum speaker loads 2-
ohm.
Check speaker
lines/systems or shorts.
Check or adequate
ventilation.
Re er to quali ied service
personnel.
Restoration
Automatic restoration
a ter normal loads are
obtained.
Turn o power switch.
Turn on into operational
loads.
Automatic restoration
a ter temperature
lowers (to 75° - 95° C)
Automatic restoration
a ter normal bias is
regained.
— 7 —
How to get good mix

BLOCK DIAGRAMS
LEVEL DIAGRAM
— 8 —
Block nd Level Di gr ms

MIXER SECTION
Frequency Response
+0, -3dB 30Hz~20kHz (HIGH Z input TRIM at "0" position.)
Tot l H rmonic Distortion
0.05% +4dBm at 1kHz.
Hum nd Noise (Open)
Equivalent Input Noise –130dBm (20Hz ~ 20kHz)
Equivalent Input Noise –133dBm (IHF A)
All level Controls Minimum –102dBm (IHF A)
PGM Master at MAX and all
input level controls minimum –93dBm (IHF A)
PGM Master at MAX and one
input level control at MAX –72dBm (IHF A)
M ximum Volt ge G in
INPUT to PGM out 59dB
INPUT to EFF out 45dB
INPUT to FB out 59dB
INPUT to REG out 45dB
INPUT to GEQ out 59dB
AUX to PGM out 24dB
EFF/RET to PGM out 24dB
Equ liz tion
63Hz ±12dB Peaking 2kHz ±12dB Peaking
125Hz ±12dB Peaking 4kHz ±12dB Peaking
250kHz ±12dB Peaking 8kHz ±12dB Peaking
500Hz ±12dB Peaking 16kHz ±12dB Peaking
1kHz ±12dB Peaking
Pe k Indic tors
Red LED on each input channel LED's t urn 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)
+20dBm (77.5mV)
+4dBm (1.23V)
+4dBm (1.23V)
MAX BEFORE
CLIP INPUT
LEVEL
+1.7dB (0.94V)
+20dB (7.75V)
———
———
CONNECTOR
XLR TYPE NC3F
PHONE JACK
PHONE JACK
PHONE JACK
PHONE JACK
PHONE JACK
OUTPUT SPECIFICATIONS
CONNECTION
PGM
EFF
GEQ
FB
REG
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 (775V)
+4dB (1.23V)
+4dB (1.23V)
–10dB (7.75V)
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
R ted Power & Lo d
300W RMS (2
) 120W RMS (8
)
)
Power Output t Clipping
1% THD, 1kHz
348W RMS (2
) 238W RMS (4
) 140W RMS (8
)
Tot l H rmonic Distortion
Less than 0.1% (200mW ~200W RMS, 20Hz~20kHz)
Typically below 0.05%
Compresser Dyn mic R nge
Greater than 26dB
Hum nd Noise
At least 110dB S/N ratio, 20Hz~20kHz
At least 113dB S/N ratio IHF-A weighted
D mping F ctor
Greater than 200 (1kHz 4
Input Sensitivity
+4dBm (1.23V)
Input Imped nce
10k
Output Connector
Phone Jack X2
Power Requirement
600 W 120V AC 50/60Hz
Dimensions
585(W)×333(H)×302(D) (23.03×13.11×11.89) inch
Weight
21 kg (46.3 lbs)
*0dBm is re erenced to 0.775V RMS.
*Specific tions re subject to ch nge without notice.
) 200W RMS (4
Specific tions
— 9 —

HIGH Z IN. TRIM/MIN. & INPUT EQ
POWER AMP POWER BAND WIDTH
POWER AMP COMPRESSOR
GEQ
POWER AMP TOTAL HARMONIC DISTORTION
REVERBERATION FREQUENCY RESPONSE
302 11.89"
585 23.03"
333
13.11"
— 10 —
Ch r cteristics Di gr ms
Appe r nce

TOA ELECTRIC CO., LTD.
KOBE, JAPAN
Printed in Japan
133-02-690-80