Toa MX-106 Operating Instructions Manual

Operating Instruction Manual

TOA POWERED MIXER

Model MX-106

TOA ELECTRIC CO., LTD.

KOBE, JAPAN

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Contents

General

Description

.........................................

2

Features

...................................................

2

Front

Panel

[Names

of

components & their

usage]

..............

3

Rear

Panel

[Names

of

components & their

usage]

...............

4

Connection

Examples

........................................

5

Input

Connections

...........................................

6

How to get a

good

mix

......................................

7

Block

and

Level

Diagrams

...................................

8

Specifications

...............................................

9

Characteristics

Diagrams

....................................

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, minus), the pin 3 hot (high, plus).

2. Description of components and functions on the MX-106.

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 -

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General Description

The MX-106 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-106. The rugged construction and specialized packaging ensure optimum
performance and reliability under even the most demanding "on the road"
applications.

The MX-106 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"
effects/echo send, and program level control.

The master control section features a one-octave (9-band) graphic equalizer, an

analog delay, 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 electronic analog delay (echo)

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

4. Post effects send

5. Lo-Z balanced XLR input

6. Hi-Z unbalanced 1/4" input

7. Power amp protection circuitry w/indicator

8. Complete patch bay w/buss link

9. Aux input w/pan and level controls

10. Echo-effects return to PGM and FB

11. Independent foldback mix

- 2 -

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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.

Foldback Control (FB)

The Foldback control determines
the level of signal assigned to the
foldback mixing buss, thus set-
ting the level of that channel in

the on-stage monitor mix.

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 mid 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 determines the

level of signal assigned to the
echo effects buss. Rotating the

control clockwise increases the

amount of echo effect in that
channel.

Input Level Control

(INPUT LEVEL)

The level control provides con-

tinuously variable adjustment

of the channel output of the

program mixing buss, thus deter-

mining the level of that channel

in the main sound system mix.

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
nominal level of the input level

control is at the "10" position.

Input Trim Control (TRIM)

The input trim adjusts the gain

of the head-amp stage of the

associated channel, providing

39dB of g ain 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

just begins to light, or only

flashes occasionally. This will

ensure lowest distortion levels

and optimum signal to noise

ratio.

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 on-

stage monitor mix.

Echo/Effects to Foldback

Control (ECHO/EFF TO FB)

This control adjusts the amount
of echo/effects signal that is
returned to the foldback buss
and thus the level of echo/effects
contained in the on-stage moni-
tor

mix.

Low Impedance Connectors

(LOW

Z)

The XLR connectors are low
impedance, electronically bal-
anced inputs with an input
impedance of 1k ohms.

High Impedance Connectors
(HIGH Z)

These connectors are unba-

lanced, standard 1/4" phone

jacks with an input impedance

of 50k ohms, and an input level

of —35dB when the trim control
is set t o "10". Wh en a plug is
inserted into the high —Z input,
the corresponding XLR connec-
tor is automatically switched

out of the input circuitry.

Program Master Control

(PGM)

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.

Echo/Effects to Program

Control (ECHO/EFF TO PGM)

This control adjusts the amount

of echo/effects signal that is

returned to the program buss

and thus the level of echo/effects
contained in the main sound
system.

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 program or

the foldback mixing busses. At

the center position, the signal is

routed equally to both busses.

Panning from one side to the

other gradually assigns the sig-

nal to either independently.

Power Amp Compression

Indicator (COMP)

The Comp LED lights when the
internal compressor is acti-

vated. The compressor is

provided to protect speaker

systems by compressing the

input signal level of the power

amplifier when clipping occurs

in the o utput stage. Frequent

flashing of the LED is not reason

for alarm. However, a constant

or steady light indicates that the

MX-106 is being overdriven and
that the internal power amplifier
is possibily "under powered" for

that application. The output
level of the MX-106 should be
decreased until the LED only

flashes intermittently.

Echo/Effects Send Control

(ECHO/EFF SEND)

This control adjusts the overall

signal level of the effects mix
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 main and monitor sound

systems.

Delay Time Control

(T1 DELAY)

The Tl control permits continu-
ously variable adjustment of the

echo time, from 10m seconds
(SHORT) to 100m seconds
(LONG).

Regeneration Control

(T2 REGEN)

The T2 control determines the

number of "repeats" of the

delayed signal from 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 com-
parison between a flat response

(out) and the equalized response
(in). The "out" position com-
pletely removes the equalizer

from the MX-106 circuitry.

Fluorescent Bargraph Peak

Meters (PGM/FB)

The high intensity meters enable
visual monitoring of the pro-

gram and foldback output 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-106

should be checked. If the LED

remains 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 amplifier, (2)

give a visual indication, and (3)

automatically shut down until

the fault condition is alleviated.

This special circuitry ensures

maximum reliability and virtu-
ally eliminates equipment dam-
age due to unsafe or fault
conditions. Please refer to fault

pr ote cti on ta ble on page 7 for

full explanation of this impor-

tant feature.

- 3 -

Buss Link Jack

(BUSS LINK)

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