Toa MX-101 Operating Instructions Manual

POWERED MIXER

Model MX-101

Operating instruction Manual

Toa Electric Co., Ltd.

KOBE, JAPAN

Contents

Precautions ................................................. 1

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

Block and Level Diagrams .................................... 7

Specifications............................................... 8

Characteristics Diagrams ..................................... 9

Appearance................................................. 9

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-101.

Various descriptions are applied, depending on each manufacturer. In our
Operating and Instruction Manual explanation of components and func-

tions is made according to our usage for them.

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General Description

The TOA MX-101 is a very compact, four channel self-powered mixer. It was

designed to deliver maximum features and performance in a cost-effective

portable PA package.

The MX-101 features four input channels, one main system output, and one

personal monitoring (foldback) output. The internal amplifier is rated at 57 watts

RMS into an 8 ohm load, and 75 watts into 4 ohms.

Each input channel has an electronically balanced XLR connector, and a
high-impedance unbalanced 1/4" phone jack. In addition, each channel features
an EQ control and a post-EQ reverb level control (send).

The master control section features a 3-band equalizer, a high-quality 2 spring

reverb, RCA tape inputs, and master volume controls for System level, Foldback,
and Reverb return to both.

The power amp features protection circuitry and autocomp compressor, both with

indicator LED's.

Features

1. Four input channels

2. 57 watts into 8 ohms, 75 watts into 4 ohms

3. 3-band EQ

4. Auto Comp compression unit w/LED

5. Built-in spring reverb

6. Power amp protection circuitry w/LED

7. System output jack

8. Tape input w/level control, RCA jacks

9. Reverb level to System

10. Foldback level control

Each Channel

1. Input level control

2. EQ control

3. Post-EQ Reverb send

4. Low-Z electronically balanced XLR input

5. Hi-Z unbalanced 1/4" input

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Front Panel

Reverb Control

This control determines the
level of signal assigned to the
reverb mixing buss. Rotating
the control clockwise increase
the amount of reverb in that

(REV)

channel.

Input Level Control

The level control provides con­tinuously variable adjustment

of the channel output to the

program mixing buss, thus de-

termining the level of that chan-

nel in the main sound system
mix. Since the reverb signal is

"post" this control, an increase

in the level of the channel's

output will also result in a

corresponding increase in the

(LEVEL)

reverb effect of that channel.
The nominal level of the input
level control is at the "10" posi­tion.

High Equalizer Control
(HIGH)

The high EQ control alters the

high frequency response, pro-

viding ±13dB at 5kHz, and

±15dB at 15kHz of continuous-

ly variable active shelving

equalization. The "0" detented

position provides flat audio re­sponse.

Middle Equalizer Control
(MID)

The mid EQ control provided

±15dB of continuously variable
active peaking equalization at
2kHz, and has a flat audio re-

sponse when set to the "0"
detented position.

Low Equalizer Control

(LOW)

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.

Tape Level Control
(TAPE)

This control sets the overall
level of the Tape input signal.

Reverb Control

(REV)

This control adjusts the amount
of reverb signal that is returned
to the program buss and thus
the level of reverb contained in

the main sound system.

Foldback Master Control (FB)

The FB master control adjusts
the overall combined signal
level of the four independent
channel level controls, and thus
the level of the entire on-stage
monitor mix.

System Level Control

(SYSTEM LEVEL)

The System level (PGM) control
adjusts the overall combined
signal level of the fou r indepen­dent channel level controls, and
thus the level of the main sound
system.

EQ Control

(EQ)

Rotating the control clockwise

decreases the low frequency

signal, and rotating the control
counter clockwise decreases
the high frequency signal. The
center position provides flat au-

dio response.

High Impedance Connectors
(HIGH Z)

These connectors are unba­lanced, standard 1/4" phone

jacks with an input impedance

of 100k o hms, and an input
level of -35dB. When a plug is
inserted into the high-Z input,

the coresponding XLR connec­tor is automatically switched
out of the input circuitry.

Low Impedance Connectors

(LOW

The XLR connectors are low
impedance, electronically ba-

lanced inputs with an input

Z)

impedance of 1k ohms.

Tape Input Jacks

These RCA pin jacks are wired

in parallel, with an input level
of -10dB.

Power Amp Compression In-

dicator
(COMP)

The comp LED lights when the
internal compressor is acti-

vated. The compressor is pro-

vided to protect speaker sys-

tems by compressing the input

signal level of the power ampli-

(TAPE)

fier when clipping occurs in the
output stage. Frequent flashing
of the LED is not reason for
alarm. However a constant or

steady light indicates that the
MX-101 is being over-driven
and that the internal power
amplifier is possibly "under po­wered" for that application. The
output level of the MX-101
should be decreased until the
LED only flashes intermittently.

Power Indicator LED

(POWER)

The indicator LED lights when

the power switch is "on".

Power Amp Protection Indica­tor

(PROTECT)

The indicator LED lights if the

power amplifier output is

shorted, if the temperature of

the unit rises above acceptable

levels, or if DC is drifted to the
speaker output. If the LED

should light, speaker wiring

and ambient temperature of the

MX-101 should be checked. If

the LED remains lighted, the

unit should be referred to qual­ified service personnel for re­pair.

Note:

The MX-101 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 cir-

cuitry ensures maximum re-

liability and virtually elimin­ates equipment damage due to
unsafe or fault conditions.
Please refer to fault protection
table on page 4 for fu ll explana­tion of this important feature.

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