MYERS MI-120S User manual

Please follow the instructions in this manual to obtain the optimum results from this unit.
We also recommend that you keep this manual handy for future reference.
MIXER ZONE AMPLIFIER
MI-350S
OPERATION MANUAL
PUBLIC ADDRESS SYSTEM
MI-240S
MI-120S
MIN MAX
MASTER VOLUME
MIC4 LINE2
LINE1
MIC LEVEL
TREBLE TREBLE
BASS BASS
TREBLE TREBLE TREBLE
BASS BASS
MIXER ZONE AMPLIFIER
VOLUME
CHIME SIREN
CHIME
SIREN
DC
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
ALL CALL
2 480 CLIPPROT
ON
OFF
AC
MI-120S
TREBLE
BASS BASS
-10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10
MIC1 MIC2 MIC3
MIN MAX MIN MAX
MIN MAX
MIN MAX
MIN MAX
MIN MAX
MIN MAX
LINE LEVEL
1
2
34
5
61
2
34
5
6
1
2
34
5
6
1
2
34
5
6
1
2
34
5
6
0
-10 +10
0 0 000000000
CHIME
ACTIVE

TABLE OF CONTENTS
2
1. SAFETY PRECAUTIONS .......................................................................................3
2. GENERAL DESCRIPTION ....................................................................................5
3. FEATURES ...............................................................................................................5
4. NOMENCLATURE AND FUNCTIONS
4.1 Front Panel ............................................................................................................ 6
4.2 Rear Panel..............................................................................................................7
5. OPERATING .............................................................................................................9
6. APPLICATIONS ......................................................................................................10
7.SPECIFICATIONS ..................................................................................................11
8.BLOCK DIAGRAM .................................................................................................12
9.DIMENSIONAL DIAGRAM ................................................................................... 13

Be sure to read the instructions in this section carefully before use.
Make sure to observe the instructions in this manual as the conventions of safety symbols and messages
regarded as very important precautions are included.
We also recommend you keep this instruction manual handy for future reference.
Safety Symbol and Message Conventions
Safety symbols and messages described below are used in this manual to prevent bodily injury and property
damage which could result from mishandling. Before operating your product, read this manual first and
understand the safety symbols and messages so you are thoroughly aware of the potential safety
Indicates a potentially hazardous situation which, if mishandled, could
result in death or serious personal injury.
Indicates a potentially hazardous situation which, if mishandled, could
result in moderate or minor personal injury, and/or property damage.
When Installing the Unit
Do not expose the unit to rain or an environment
where it may be splashed by water or other liquids,
as doing so may result in fire or electric shock.
Use the unit only with the voltage specified on the
unit. Using a voltage higher than that which is
specified may result in fire or electric shock.
Do not cut, kink, otherwise damage nor modify the
power supply cord. In addition, avoid using the
power cord in close proximity to heaters, and never
place heavy objects -- including the unit itself -- on
the power cord, as doing so may result in fire or
electric shock.
Be sure to replace the unit's terminal cover after
connection completion. Because high voltage is
applied to the speaker terminals, never touch these
terminals to avoid electric shock.
Be sure to ground to the safety ground (earth)
terminal to avoid electric shock. Never ground to a
gas pipe as a catastrophic disaster may result.
Avoid installing or mounting the unit in unstable
locations, such as on a rickety table or a slanted
surface. Doing so may result in the unit falling
down, causing personal injury and/or property
damage.
When the Unit is in Use
Should the following irregularity be found during
use, immediately switch off the power, disconnect
the power supply plug from the AC outlet and
contact your nearest dealer. Make no further
attempt to operate the unit in this condition as this
may cause fire or electric shock.
If you detect smoke or a strange smell coming
from the unit.
If water or any metallic object gets into the unit
If the unit falls, or the unit case breaks
If the power supply cord is damaged (exposure of
the core, disconnection, etc.)
If it is malfunctioning (no tone sounds.)
To prevent a fire or electric shock, never open nor
remove the unit case as there are high voltage
components inside the unit. Refer all servicing to
your nearest dealer.
Myers
Myers
Do not place cups, bowls, or other containers of
liquid or metallic objects on top of the unit. If they
accidentally spill into the unit, this may cause a fire
or electric shock.
Do not insert nor drop metallic objects or
flammable materials in the ventilation slots of the
unit's cover, as this may result in fire or electric
shock.
3
1. SAFETY PRECAUTIONS

An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in
the electrical installation of the building.
When Installing the Unit
Never plug in nor remove the power supply plug
with wet hands, as doing so may cause electric
shock.
When unplugging the power supply cord, be sure
to grasp the power supply plug; never pull on the
cord itself. Operating the unit with a damaged
power supply cord may cause a fire or electric
shock.
When moving the unit, be sure to remove its power
supply cord from the wall outlet. Moving the unit
with the power cord connected to the outlet may
cause damage to the power cord, resulting in fire or
electric shock. When removing the power cord, be
sure to hold its plug to pull.
Do not block the ventilation slots in the unit's cover.
Doing so may cause heat to build up inside the unit
and result in fire.
Avoid installing the unit in humid or dusty locations,
in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke or
steam as doing otherwise may result in fire or
electric shock.
When the Unit is in Use
Do not place heavy objects on the unit as this may
cause it to fall or break which may result in
personal injury and/or property damage. In
addition, the object itself may fall off and cause
injury and/or damage.
Make sure that the volume control is set to
minimum position before power is switched on.
Loud noise produced at high volume when power is
switched on can impair hearing.
Do not operate the unit for an extended period of
time with the sound distorting. This is an indication
of a malfunction, which in turn can cause heat to
generate and result in a fire.
Contact your dealer as to the cleaning. If dust
is allowed to accumulate in the unit over a long
period of time, a fire or damage to the unit may
result.
Myers
If dust accumulates on the power supply plug or in
the wall AC outlet, a fire may result. Clean it
periodically. In addition, insert the plug in the wall
outlet securely.
Switch off the power, and unplug the power supply
plug from the AC outlet for safety purposes when
cleaning or leaving the unit unused for 10 days or
more. Doing otherwise may cause a fire or electric
shock.
SAFETY PRECAUTIONS
4

1. .
2.
3. .
4. .
5. .
6. .
7.
5 zone output and 5 zone separate volume control
Built-in
Built-in 24V interface
Each channel with separate treble and bass control
Built-in 24V phantom power and separate power switch
Capacity of controlling by remote paging MIC
Selectable priority muting.
Switchable audio signal priority for MIC channels 1.
1 EMC input signal over other input soures, all 100V-open the area.
2 Remote MIC and Telephone input over SIREN, CHIME, MIC 1~4,LINE 1~2, input sources.
3 MIC 1 SIREN CHIME over MIC 2~3, LINE 1~2 input sources.
siren.
The Mixer Zone Amplifier series is equiped with priority function. They are designed to suit all PA system
application in schools home offices and stores.
5
3. FEATURES
2. GENERAL DESCRIPTION

4.1 FRONT PANEL
1.
I
2.
3.
4.
=
=
.
TONE CONTROL
ndividual Bass and Treble controls are used
to cut(decrease) or boost(increase) the lower
and Higher frequencies +12dB.
CHANNEL VOLUME
Controls the individual volume levels of Cha-
nnels.
CHIME INDICATOR AND SIREN/NDICATOR
SELECT KEY
CHIME
When the key out, select chime state, chime
indicator LED on, activate chime signal and
selection zone output.
SIREN
When key in, the siren is acticated, all the
zone will be open and siren signal output.
5CHIME AND SIREN VOLUME
6. INTERNAL CHIME ACTIVE
7. MASTER VOLUME
This rotary switch controls the overall output
volume of the amplifiers output signal.
8. CHIME ACTIVE INDICATOR
9. DC INDICATOR
24V DC supply power the indicator on
10.POWER SWITCH
Pressing this switch turns the unit on, as ind-
icated by the Power LED above the switch.
Pressing it again turns the unit off.
2
12
5
MIN MAX
MASTER VOLUME
MIC4 LINE2
LINE1
MIC LEVEL
TREBLE TREBLE
BASS BASS
TREBLE TREBLE TREBLE
BASS BASS
VOLUME
CHIME SIREN
CHIME
SIREN
DC
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
ALL CALL
2 480 CLIPPROT
ON
OFF
AC
TREBLE
BASS BASS
-10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10
MIC1 MIC2 MIC3
MIN MAX MIN MAX
MIN MAX
MIN MAX
MIN MAX
MIN MAXMIN MAX
LINE LEVEL
1
2
34
5
61
2
34
5
6
1
2
34
5
6
1
2
34
5
6
1
2
34
5
6
0
-10 +10
0 0 000000000
CHIME
ACTIVE
13467891110
13141516171819
12.
11.AC INDICATOR
~220-240V AC supply power the indicator on
SPEAKER SELECTOR
These switches are used to select output to
any combination of up to five individual
speakers.
MIN 2
12.5V6V
OUTPUT
VOLTAGE
120W
240W
350W
6V
6V
12.5V
12.5V
3 4 5
70V50V
22V
32V
38V
50V
50V
70V
70V
MAX
100V
100V
100V
13.(
ZONE1~ZONE5)ZONE SELECTION BUTTON
14.(ZONE1~ZONE5)ZONE SELECTION INDICATOR
15.ALL CALL INDICATOR
16.ALL CALL CONTROL
17.CLUP INDICATOR LED
18.OUTPUT LEVEL INDICATOR LED
19.PROTECT INDICATOR LED
6
4. NOMENCLATURE AND FUNCTIONS

COM100V COM100VCOM100VCOM100VCOM100V
CHIME ACTIVE
REMOTE MIC
VOLUME
DC24V
+24V PHANTOM
ON OFF
+24V PHANTOM
ON OFF
+24V PHANTOM
ON OFF
+24V PHANTOM
ON OFF
TEL
VOLUME
INPUT
LINE 1
OUTPUT
LINE 2 LINE
TEL
EMC
BATT SUPPLY
PRIORITY
COM
4
8
OUTPUT
INPUT
MIC 1 MIC 2 MIC 3 MIC 4
REMOTE
1
2
3
XLR BAL
1-GND
2-HOT+
3-COLD-
GAIN GAIN GAIN GAIN
CHIME
2 TONE 4 TONE
70V100V
ZONE 1ZONE 2
ZONE 3
ZONE 4ZONE 5
32
4.2 REAR PANEL
2920 21 22 23 24 25 26 27 28
3538 37 313336 34
20.
21.
DC INPUT TERMINALS
These terminals are provided for the conne-
ction of backup battery.Connect a 24VDC 50A
battery source to these terminals.Make certain
the red terminal is connected to the battery's
positive (+) side,and the black terminal to the
battery's negative (-) side.
INPUT GAIN CONTROLS(TRIM VR)
These knobs provide continuous control of the
input levels for each of the six input channels.
When adjusting the input gain, make certain
that the levels are not set too high, or distortion
will result.
NOTE: It is safe to connect most modern dynamic
microphones or line level devices to the
channel Inputs when phantom power is
activated. However, some older ribbon
microphones may be damaged by phan-
tom power, and certain unbalanced line
level devices maymalfunction or produce
an Audible hum when phantom power is
active.
22.MIC INPUT CHANNEL 1~4
This is a special connector which will accept
either a 3-conductor XLR or a 3-conductor 1/3
jack.These inputs are suitable to receive signal
from microphones level devices.
+24V
+24V
(3)COLD
(2)HOT
(1)GNO
0V
23.
24.
25.
26.
LINE INPUT CHANNEL 1~2
This line-level input is an extra stereo input for a
stereo source such as a tape deck or CD player.
LINE OUTPUT
(Connection for power amplifier or recording equi-
pment)
EMC INPUT
When EM switch is connected and pressed in fire
or other emergencies, EM broadcasting stored in
voice ic is outputted. When selected, these switc-
hes will give priority to over all other signals inputs.
TEL AUDIO INPUT
Remote telephone paging and announcement
27.TEL AUDIO VOLUME
28.CHIME
2 Tone/4 Tone chime switch
29.FANNER
30.CHIME ACTIVE
Automatic or manual activate chime when paging
31.REMOTE MIC VOLUME
32.REMOTE CONTROL INPUT
By connecting a 15-pin D-SUB connector, it is po-
ssible to control speaker zone selection and activ-
ate the chime via wired remote. connection term-
inals for the remote are shown below.
MIC JACK (XLRJACK)
Pin 1:GROUND
Pin 2:HOT(+)
Pin 3:COLD(-)
LINE JACK (TRSPHONE JACK)
Sleeve:GROUND
Tip:HOT(+)
Ring:COLD(-)
GROUND
2.HOT
3.COLD
1.
1
3
2
HOT
COLD
30
GROUND
NOMENCLATURE AND FUNCTIONS
7
REMOTE MIC
GAIN

33.REMOTE MIC VOLUME
34.MIC 1 PRIORITY SWITCH
When selected, these switches will give prio-
rity to channels 1 over all other channels in-
puts.
35.4 hms\8 hms 70V\100V SPEAKER OUT-
PUT TERMINAL
This terminal is for speaker wire connection.
connect speakers whose combined impeda-
nce is equal to or higher than the rated output
impedance, as shown below.
36.(CH1~CH5)ZONE SPEAKER OUTPUT
37.POWER SWITCH
This switch turns the phantom power supply
on or off for all channels. When the switch is
turned on,+24V DC power is supplied to pins
2 and 3 of each channel's input connector.
Use phantom power when connecting cond-
enser microphones, which require an external
power supply.
38.~220-240V 50/60HZ POWER INPUT
Pin 1: Remote amplifier input signal hot(+)
Pin 2: Remote amplifier input signal cold(-)
Pin 3: Signal ground
Pin 4: Remote control 1(Speaker 1)
Pin 5: Remote control 2(Speaker 2)
Pin 6: Remote control 3(Speaker 3)
Pin 7: Remote control 4(Speaker 4)
Pin 8: Remote control 5(Speaker 5)
Pin 9: Remote control ground
Pin 10: DC +24V
Pin 11: Input Chime
Pin 12: NC
Pin 13: NC
Pin 14, 15: NC
8
NOMENCLATURE AND FUNCTIONS

CONNECTING SPEAKERS
5. OPERATING
Before connecting speakers, disconnect the AC
power cable. Note the proper connecting terminals
as shown Below. Make certain that the total impe-
dance is not less than the rated impedance indicated.
CONNECTING HIGH-VOLTAGE DISTRIBUTED
SPEAKER SYSTEMS
When connecting speaker system in parallel,
you can connect speakers with a total rated input
of up to 100W.
NOTE: Be sure that total impedance is not less than
rated impedance. (See upper chart.)
WARNING: Extreme care must be exercised when
connecting high-impedance systems, as
Potentially Hazardous voltages may be
present at these terminals.
Do not install this equipment in a confined space with
less-than-adequate ventilation.
=
COM 100V
CH 1 CH 2 CH 3 CH 4 CH 5
COM 100V COM 100VCOM 100V COM 100V
COM100W100W100W100W100W
9

DC24V
+24V PHANTOM
ON OFF
+24V PHANTOM
ON OFF
+24V PHANTOM
ON OFF
+24V PHANTOM
ON OFF
TEL
VOLUME
INPUT
LINE 1
OUTPUT
LINE 2 LINE
TEL
EMC
BATTSUPPLY
PRIORITY
COM
4
8
OUTPUT
INPUT
MIC 1 MIC 2 MIC 3 MIC 4
REMOTE REMOTE MIC
VOLUME
1
2
3
XLR BAL
1-GND
2-HOT+
3-COLD-
CHIME ACTIVE
GAIN GAIN GAIN GAIN
CHIME
2 TONE 4 TONE
REMOTE MIC
GAIN
70V100V
COM100V COM100VCOM100VCOM100VCOM100V
ZONE 1ZONE 2
ZONE 3
ZONE 4ZONE 5
MICROPHONE WITH ZONE CONTROL
1
2
3
010
010
010
CHIME VOL. MASTER VOL.
MIC VOL.
ON
OFF
POWER
24VDC
1
2
3
1 GND
2 GND
3 +24DC
CHIME
2 TONE 4 TONE
TEL
OUTPUT
MIC
ACTIVE OUT
BATTERY
24DC
MIC 2MIC 1 MIC 4MIC 3
+ ALARM IN -
ALARM OUT
EMERGENCY PANEL
AUDIO
OUT
R L
AUDIO SOURCES
MIC LINE
COM
ADRESS TAG
TELEPHONE INTERFACE
SPEAKERS SPEAKERS
6. APPLICATIONS
OTHER AMPLIFIER
10

7. SPECIFICATIONS
AMPLIFIER SECTION
(4OHMS LOAD OUTPUT)
RATED OUTPUT POWER (THD 1%)
SPEAKER ZONE 1~5 OUTPUT 25W
INPUT SENSITIVITY/IMPEDANCE
S/N
MIC INPUT SECTION
(MIC 1~4 IN@1KHZ)
LINE INPUT SECTION
(LINE1~2 IN@1KHZ)
INPUT SENSITIVITY/IMPEDANCE
INPUT SENSITIVITY/IMPEDANCE
S/N
S/N
FREQUENCY RESPONSE ( 3DB)
FREQUENCY RESPONSE ( 3DB)
PHANTOM POWER
TONE CONTROL (BASS:100HZ,
TREBLE:10KHZ)
TONE CONTROL (BASS:100HZ,
TREBLE:10KHZ)
FREQUENCY RESPONSE ( 3DB)
PRE AMP OUT(MIC 1~4, LINE 1~2, TEL IN, REMOTE IN)
T.H.D
REMOTE MIC
POWER SOURCE
POWER CONSUMPTION
WEIGHT
DIMENSIONS(mm)
TEL AUDIO INPUT
350W(RMS) 240W(RMS) 120W(RMS)
70W MAX 50W MAX 20W MAX
MI 350S MI-240S MI-120S
2.45MV/5K BAL/245MV/5KohmBAL
250mV/47Kohm
Better than 55dB
Better than 65dB
100Hz~15KHz
80Hz~15KHz
+12dB
12dB
+24VDC
0.3V/10K
Better than 65dB
100Hz~15KHz
0dBV/600
Less than 0.5%
30mV/600
~220-240V;
50/60Hz, 24VDC
500W 350W 200W
484*450*132 484*450*132 484*450*132
24.5Kg 20.4Kg 17.1Kg
11

8. BLOCK DIAGRAM
8ohm
8ohm
12

Over
100
Over
UNIT :mm
Over
100
128
25
450
425
128
436
132
138
9.DIMENSIONAL DIAGRAM
484
UNIT :mm
100
6
DC24V
+24V PHANTOM
ON OFF
+24V PHANTOM
ON OFF
+24V PHANTOM
ON OFF
+24V PHANTOM
ON OFF
TEL
VOLUME
INPUT
LINE 1
OUTPUT
LINE 2 LINE
TEL
EMC
BATT SUPPLY
PRIORITY
COM4
8
OUTPUT
INPUT
MIC 1 MIC 2 MIC3 MIC 4
REMOTE REMOTE MIC
VOLUME
1
2
3
XLR BAL
1-GND
2-HOT+
3-COLD-
CHIME ACTIVE
GAIN GAIN GAIN GAIN
CHIME
2 TONE 4 TONE
REMOTE MIC
GAIN
70V100V
COM100V COM100VCOM100VCOM100VCOM100V
ZONE 1ZONE 2
ZONE 3
ZONE 4ZONE 5
13
MIN MAX
MASTER VOLUME
MIC4 LINE2
LINE1
MIC LEVEL
TREBLE TREBLE
BASS BASS
TREBLE TREBLE TREBLE
BASS BASS
VOLUME
CHIME SIREN
CHIME
SIREN
DC
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
ALL CALL
2 480 CLIPPROT
ON
OFF
AC
TREBLE
BASS BASS
-10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10
MIC1 MIC2 MIC3
MIN MAX MIN MAX
MIN MAX
MIN MAX
MIN MAX
MIN MAX
MIN MAX
LINE LEVEL
1
2
34
5
61
2
34
5
6
1
2
34
5
6
1
2
34
5
6
1
2
34
5
6
0
-10 +10
0 0 000000000
CHIME
ACTIVE
MIN MAX
MASTER VOLUME
MIC4 LINE2
LINE1
MIC LEVEL
TREBLE TREBLE
BASS BASS
TREBLE TREBLE TREBLE
BASS BASS
VOLUME
CHIME SIREN
CHIME
SIREN
DC
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
ALL CALL
2 480 CLIPPROT
ON
OFF
AC
TREBLE
BASS BASS
-10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10 -10 +10
MIC1 MIC2 MIC3
MIN MAX MIN MAX
MIN MAX
MIN MAX
MIN MAX
MIN MAXMIN MAX
LINE LEVEL
1
2
34
5
61
2
34
5
6
1
2
34
5
6
1
2
34
5
6
1
2
34
5
6
0
-10 +10
0 0 000000000
CHIME
ACTIVE

PUBLIC ADDRESS SYSTEM
VersionV0.1