Toa MX-106R Operating Instructions Manual
Operating Instruction Manual
TOA POWERED MIXER
Model MX-106R
TOA ELECTRIC CO., LTD.
KOBE, JAPAN
Contents
General Description
Features
Front Panel [Names of components & their usage]
Rear Panel [Names of components & their usage]
Connection Examples
Input Connections
How to get a good mix
Block and Level Diagrams
Specifications
Characteristics Diagrams
Appearance
2
2
3
4
5
6
7
8
9
10
10
Precautions
1. XLR Type Audio Connector
The connectors are wired as follows.
The pin 1 is ground (shield), the pin 2 cold (low, minus), the pin 3 hot (high, plus).
2. Description of components and functions on the MX-106R.
Various descriptions are applied, depending on each manufacturer. In our
Operating and Instruction Manual explanation of components and functions is
made according to our usage for them.
— 1 —
General Description
The MX-106R is a compact self-powered mixer with a wide array of sophisticated
features — many of them unavailable on any competitive models. An examination of
performance levels and specifications will reveal the truly professional nature of the
MX-106R. The rugged construction and specialized packaging ensure optimum
performance and reliability under even the most demanding "on the road"
applications.
The MX-106R features 6 input channels; 1 program, 1 foldback, and 1 effects output.
The internal power amplifier is rated at 120 watts into 8 ohms, 200 into 4, and 300 into
a 2 ohm load.
Each input channel features 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 of input source levels. A peak indicator LED detects
excessive input signal (either pre or post EQ), aiding in proper settings of the trim
control to avoid input clipping.
Each channel also features 3-band equalization, a "pre" foldback send, a "post"
reverb/effects send, and program level control.
The master control section features a one-octave (9-band) graphic equalizer, high and
low equalizer control of an internal reverberation unit, auxiliary input controls,
fluorescent high-intensity bargraph output meters, and a full patch bay with our
exclusive Bus-Link capability. All master level controls, and effects return to program
and foldback busses are also contained in this section.
Features
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 fluorescent bar graph metering
Each Channel
1. Input trim control w/ LED peak indicator
2. Pre EQ foldback send
3. 3-band EQ
7. Power amp protection circuitry w/indicator
8. Complete patch bay w/buss link
9. Aux input w/pan and level controls
10. Reverb-effects return to PGM and FB
11. Independent foldback mix
4. Post effects send
5. Lo-Z balanced XLR input
6. Hi-Z unbalanced 1/4" input
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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
optimum setting of the trim control.
The Foldback control deter-
mines the level of signal assign-
ed to the foldback mixing buss,
thus setting the level of that
channel in the on-stage monitor
mix.
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.
The mid EQ control provides
±15dB of continuously variable
active peaking equalization at
2kHz. and has a flat audio re-
sponse when set to the "0"
detented position.
The low EQ control provides
±13dB at 100Hz and ±15dB at
50Hz of c ontinuously variable
active shelving equalization.
The "0" detented position pro-
Foldback Control (FB)
High Equalizer Control
Middle Equalizer Control
Low Equalizer Control
(HIGH EQ)
(MID
EQ)
(LOW
EQ)
vides flat audio response.
Reverb/Effects Control
This control determines the
level of signal assigned to the re-
verb effects buss. Rotating the
control clockwise increases the
amount of reverb effect in that
channel.
The level control provides continuously variable a djustment
of the channel output to the
program mixing buss, thus deter-
mining the level of that channel
in the main sound system mix.
Since th e reverb/effects signal is
"post" this control, an increase
in the level of the channel's out-
put will also result in a cor-
responding increase in the reverb effect of that channel. The
nominal level of the input level
(REV/EFF)
Input Level Control
(INPUT LEVEL)
control is at the "10" position.
Low Impedance Connectors
(LOW
The XLR connectors are low im-
pedance, electronically balanced
inputs with an input impedance
of 1k ohms.
Z)
Input Trim Control (TRIM)
The input trim adjusts the gain
of the head-amp stage of the associated channel, providing
39dB of gain control. When the
trim control is set to the "10"
position, the nominal 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 trim of each channel should
be adjusted so that the peak LED
ju st begins to light , or only
flashes occasionally. This will
ensure lowest distortion levels
and optimum signal to noise
ratio.
Graphic Equalizer
(EQUALIZATION)
The graphic equalizer is 1/1
octave with 9 independent ac-
tive bands ( filters), providing
12dB of boost or c ut at each
center frequency. The "0" detented position provides flat
audio response.
High Impedance Connectors
(HIGH Z)
These connectors are unbalanced, standard 1/4" phone
jacks with an input impedance
of 50k ohms, and an input level
of –35dB when the trim control
is set to "10". Whe n a plug is inserted into the high –Z input, the
corresponding XLR connector is
automatically switched out of
the input circuitry.
Program Master Control
The PGM control adjusts the
overall combined signal level of
the six independent channel
level controls, and thus the level
of the main sound system.
Reverb/Effects to Program
This control adjusts the amount
of reverb/effects signal that is
returned to the program buss
and thus the level of reverb/
effects contained in the main
sound system.
This control sets the overall
level of the Aux input signal.
(REV/EFF TO PGM)
Aux Level Control (AUX)
(PGM)
Control
Foldback Master Control (FB)
The FB master control adjusts
the overall combined signal
level of the six independent
channel foldback sends, and
thus the level of the entire onstage monitor mix.
Reverb/Effects to Foldback
Control (REV/EFF TO FB)
This control adjusts the amount
of reverb/effects signal that is
returned to the foldback buss
and thus the level of reverb/
effects contained in the on-stage
monitor mix.
Buss Link Jack
(BUSS LINK)
Patching Jack
(PATCH BAY/IN)
Patching Jack
(PATCH BAY/OUT)
Aux Panpot (AUX PAN)
This control assigns the auxiliary input signal (a tapedeck,
etc., connected to the aux input
jacks) to either the program or
the foldback mixing busses. At
the center position, the signal is
routed equally to both busses.
Panning from one side to th e
other gradually assigns the
signal to either independently.
Power Amp Compression
The Comp LED lights when the
internal compressor is activated. The compressor is provided to protect speaker systems
by compressing the in pu t signal
level of the power amplifier
Indicator (COMP)
when clipping occurs in the out-
put stage. Frequent flashing of
the LED is not reason for alarm.
However, a constant or steady
light indicates that the MX-106R
is being overdriven and th at the
internal power amplifier is
possibily "under powered" for
that application. The outpu t
level of the MX-106R should be
decreased un til the LED only
flashes intermittently.
Reverb/Effects Send Control
(REV/EFF SEND)
This control adjusts the overall
signal level of the effect s mix
that is delivered to the internal
reverberation unit, or to an
external effects device through
the effects output. The send control works in conjunction with
the REV/EFF to PGM and the
REV/EFF to FB controls to set
the overall level of reverb/
effects in the main and monitor
sound systems.
Reverberation Low Equalizer
Control
(REV
LOW EQ)
The low EQ control alters the
low frequency response of the
reverberation signal. The "0" detented position provides flat
audio response.
Reverberation High Equalizer
Control
(REV HIGH EQ)
The high EQ control alters the
high frequency response of the
reverberation signal. The "0" detented position provides f lat
audio response.
Graphic Equalizer In/Out
Switch (IN/OUT)
The in/out switch enables comparison between a flat response
(out) and the equalized response
(in). The "out" position completely removes the equalizer
fr om the MX-106R circuitry.
Fluorescent Bargraph Peak
Meters (PGM/FB)
The high intensity meters enable
visual monitoring of the program and foldback ou tput signal
levels.
Power Amp Protection
Indicator (PROTECT)
The indicator LED lights if the
power amplifier output is short-
ed, if the temperature of the unit
rises above acceptable levels, or
if DC is drifted to the speaker
outputs. If the LED should light,
speaker wiring and ambient
temperature of the MX-106R
should be checked. If the LED
remains lighted, the unit should
be referred to qualified service
personnel for repair.
Note:
The MX-106R p ro te ct io n circuitry will (1) detect 'faulty conditions' within the power amplifier, (2) give a visual indication, and (3) automatically shut
down until the fa ult condition is
alleviated. This special circuitry
ensures maximum reliability
and virtually eliminates equip-
ment damage due to unsafe or
fault conditio ns . Please r efer t o
fault protection table on page 7
for fu ll explanation of this
important feature.
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3 —
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