Toa MX-101 Instruction Manual

POWERED MIXER
Operating instruction Manual
Model MX-101
Toa Electric Co., Ltd.
KOBE, JA AN

Contents
Precautions ................................................. 1
General Description ......................................... 2
Features.................................................... 2
Front Panel (Names of components & their usage) ............... 3
Rear Panel (Names of components & their usage) ................ 4
onnection Examples ........................................ 5
Input onnections ........................................... 6
Block and Level Diagrams .................................... 7
Specifications............................................... 8
haracteristics 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.
— 1 —

eneral 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, R A 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 omp 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, R A 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
— 2 —

Front Panel
Reverb Control
(REV)
This control determines the
level of signal assigned to the
reverb mixing buss. Rotating
the control clockwise increase
the amount of reverb in that
channel.
High Equalizer Control
(HI H)
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 re-
sponse.
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.
Input Level Control
(LEVEL)
The level control provides con-
tinuously 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
reverb effect of that channel.
The nominal level of the input
level control is at the "10" posi-
tion.
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 four indepen-
dent channel level controls, and
thus the level of the main sound
system.
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.
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.
Tape Input Jacks
(TAPE)
These R A pin jacks are wired
in parallel, with an input level
of -10dB.
Power Indicator LED
(POWER)
The indicator LED lights when
the power switch is "on".
Power Amp Protection Indica-
tor
(PROTECT)
The indicator LED lights if the
power amplifier output is
shorted, if the temperature of
the unit rises above acceptable
levels, or if D 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 qual-
ified service personnel for re-
pair.
High Impedance Connectors
(HI H Z)
These connectors are unba-
lanced, standard 1/4" phone
jacks with an input impedance
of 100k ohms, and an input
level of -35dB. When a plug is
inserted into the high-Z input,
the coresponding XLR connec-
tor is automatically switched
out of the input circuitry.
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-
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 po-
wered" for that application. The
output level of the MX-101
should be decreased until the
LED only flashes intermittently.
Low Impedance Connectors
(LOW Z)
The XLR connectors are low
impedance, electronically ba-
lanced inputs with an input
impedance of 1k ohms.
Note:
The MX-101 protection circuit-
ry will (1) detect 'faulty condi-
tions' within the power ampli-
fier, (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 elimin-
ates equipment damage due to
unsafe or fault conditions.
Please refer to fault protection
table on page 4 for full explana-
tion of this important feature.
— 3 —

Rear Panel
Speaker Jacks
(SPEAKERS)
The speaker outputs are stan-
dard 1/4" phone jacks wired in
parallel. Speaker cables (recom-
mend at least #18 gauge wire)
should be connected between
the MX-101 and the speaker
systems prior to applying pow-
er to the unit.
System Output Jack
(SYSTEM OUT)
The System Out jack is pro-
vided for connection to external
equalizers and / or power amps.
Nominal output level is +4dB
with an impedance of 600
ohms.
Caution - The MX-101 should
never be operated into less than
a 4 ohms speaker load.
Foldback Output Jack
(FB OUT)
This jack is for connection to
external power amplifiers and /
or equalizers for the on-stage
monitoring system. Nominal
output level is +4dB with an
impedance of 600 ohm.
Caution:
To insure maximum cooling of
the MX-101, adequate clearance
should be maintained between
the rear panel and any other
surface (4 - 6 inches should do).
The vents on the bottom and
top of the MX-101 are also
provided for convection cool-
ing. These vents should be kept
clear and open. Failure to do so
may cause thermal shut-down
of the unit.
Power Switch
(POWER)
The power switch is a three-
position type with the middle
position being the "off" posi-
tion. The MX-101 should be
operated in the switch position
which produces the lowest
amount of system hum.
AC Power Cord
The power cord is the three-
wire type with proper ground-
ing facilities.
Earth Terminal ( ND)
AC Fuse
Caution - The ground pin
should not be removed under
any circumstances. If the MX-
101 must be used without prop-
er grounding facilities, a suit-
able grounding adapter should
be utilized.
Operation of the MX-101 with
proper grounding techniques
will result in less system noise
and greatly reduced shock
hazard.
Warning
To avoid possible equipment
damage and / or personnel in-
jury, the fuse should always be
replaced with same type and
rating. Using improper fuses
will also void the warranty. The
MX-101 should always be dis-
connected from A outlet prior
to changing fuses. If fuses repe-
atedly fails, the unit should be
referred to qualified service per-
sonnel for repair.
Fault Protection Table
Fault
Excessive current due to
overloads.
Short circuits
(less than 0.4-ohm)
Temperature rise of heat
sink
(more than 105° )
D drift
Protection
urrent limiter activates
at less than 2 ohm.
urrent limiter activates
input signal is lowered,
unit shuts down.
Input signal is lowered.
Unit shuts down
Input signal is lowered.
Unit shuts down
Indication
ompressor
LED illuminates
Amp protection
LED illuminates.
Amp protection
LED illuminates.
Amp protection
LED illuminates.
Action
Remove excessive loads
Minimum speaker loads
4 ohm.
heck speaker
lines/systems for shorts.
heck for adequate
ventilation.
Refer to qualified service
personnel
Restoration
Automatic restoration
after normal loads are
obtained.
Turn off power switch.
Turn on into operational
loads.
Automatic restoration
after temperature
lowers (to 75° - 95° )
Automatic restoration
after normal bias is
regained
— 4 —

Connection Examples
SPEAKER SYSTEM (Self powered speakers)
for foldback
MAIN SPEAKER SYSTEM
From FB OUT Jack
on Rear Panel
From Speaker Jack
on Real Panel
Low Z input should be connected
with low impedance (50 ohm ~ 600 ohm)
microphones
Line Out
KEYBOARD
CASSETTE TAPE DECK
for playback
Line Out
MUSICAL INSTRUMENT
— 5 —

Input Connections
Generally speaking, there are two rules to follow when connecting equipment
outputs to the inputs of other equipment.
1. Properly match the impedances of the outputs and inputs.
2. onnect 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 of the
MX-101 is provided with an Input Level ontrol that includes a negative feedback
(NF) circuitry, so the usable signal level range is wide. Input impedances and
levels are shown in the following table.
INPUT SPECIFICATIONS
CONNECTION
H1
H4
TAPE
INPUT
LOW Z
HIGH Z
ACTUAL
LOAD
IMPEDANCE
OPEN
FOR USE
WITH
NOMINAL
MI RO-
PHONES
OR
LOWER IMP
LINES
OR
LOWER IMP.
LINES
SENSITIVITY*
(P M OUTPUT
LEVEL +4dB)
-60dB(0.78mV)
-35dB(13.8mV)
-10dB(245mV)
CONNECTOR
XLR TYPE
N 3FPP
PHONE JA K
R A PIN JA K
* Sensitivity is the level required to produce a program 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 from one piece of equipment to another is long (more than 5m),
we recommend that balanced outputs be connected to balanced inputs.
As is described in the beginning of the Operating Instructions Manual, the
connectors of the MX-101 are wired as follows: Pin 1 is ground (shield). Pin 2 is
cold (low, minus). Pin 3 is hot (high, plus)
— 6 —

Block and Level Diagrams
BLOCK DIA RAMS
LEVEL DIA RAM
— 7 —

Specifications
MIXER SECTION
Frequency Response
+ 1, -3dB 30Hz~20kHz (input LEVEL at "5" position)
Total Harmonic Distortion
0.05% +4dB* at 1kHz.
Hum and Noise (Open)
Equivalent Input Noise
Equivalent Input Noise
All level ontrols Minimum
SYSTEM Master at MAX and all
input level controls minimum
SYSTEM Master at MAX and one
input level control at Max
-132dB* (20Hz~
20kHz)
-134dB* (IHFA)
-105dB* (IHFA)
-87dB* (IHFA)
-70dB* (IHFA)
Maximum Voltage ain
INPUT to SYSTEM out
INPUT to FB out
TAPE to SYSTEM out
Equalization
50Hz ±15dB Shelving
2kHz ±15dB Peaking
15kHz ±15dB Shelving
INPUT SPECIFICATIONS
CONNECTION
H1
H4
TAPE
INPUT
LOW Z
HIGH Z
ACTUAL
LOAD
IMPEDANCE
OPEN
FOR USE
WITH
NOMINAL
MI RO-
PHONES
OR
LOWER IMP
LINES
OR
LOWER IMP
LINES
SENSITIVITY*
(P M OUTPUT
LEVEL +4dB)
-60dB(0.78mV)
-35dB(13.8mV)
-10dB(245mV)
CONNECTOR
XLR TYPE
PHONE JA K
R A PIN JA K
OUTPUT SPECIFICATIONS
CONNECTION
SYSTEM
FB
ACTUAL
SOURCE
IMPEDANCE
FOR USE WITH
NOMINAL
OR HIGHER
IMP LINES
OR HIGHER
IMP LINES
OUTPUT LEVEL*
NOMINAL
+4dB(1.23V)
+4dB(1.23V)
MAX BEFORE
CLIP
+ 20dB(7.75V)
+ 20dB(7.75V)
CONNECTOR
PHONE JA K
PHONE JA K
POWER AMPLIFIER SECTION
Frequency Response
+ 0 -1dB 15Hz to 30kHz (75 W RMS )
Rated Power & Load
75W RMS 57W RMS
Power Output at Clipping
1% THD. 1kHz
80W RMS 60W RMS
Total Harmonic Distortion
Less than 0.1% (100mW~75W RMS. 20Hz~20kHz.
Typically below 0.05%
Compresser Dynamic Range
Greater than 26dB
Hum and Noise
At least 100dB S/N ratio. 20Hz~20kHz
At least 108dB S/N ratio IHF-A weighted
Damping Factor
200 (1kHz
Output Connector
Phone Jack × 2
Power Requirement
182 W
Dimensions
460(W) × 171(H) × 248(D) (18.11 × 6.73 × 8.91) ins.
Weight
7.5 Kg (16.5 Ibs)
*0dB is referenced to 0.775V RMS.
*Specifications are subject to change without notice.
64dB
64dB
14dB
— 8 —

Characteristics Diagrams
HI H Z IN. & INPUT EQ
3 BAND EQ
POWER AMP POWER BAND WIDTH
POWER AMP T.H.D. vs POWER OUTPUT
POWER AMP COMPRESSOR
REVERBERATION FREQUENCY RESPONSE
Appearance
— 9 —