Full Text Searchable PDF 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.
PRE AMPLIFIER
1 1+2 2
OUTPUT
OUTPUT
OUTPUT
1 1+2 2
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
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6
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0
1
9
0 0
0 0
0 0
HIGH
LOW
HIGH
+3
0
-3
-8
-13
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
P.T.T 1
CHIME
MASTER
MASTER
1
LOW
MASTER
MASTER
2
PRIORITY2
PRIORITY3
PRIORITY4
LINE
MIC
POWER
MASTER VOLUME
1
2
MASTER VOLUME
MIC/LINE 2
MIC/LINE 3
MIC/LINE 4
MIC/LINE 5
MIC/LINE 6
MIC/LINE 7
MIC/LINE 8
MIC/LINE 9
MIC/LINE 10
ON
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
ON
1 2 3
P
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PUBLIC ADDRESS SYSTEM
www.mcmelectronics.com
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MODEL 555-26105
TABLE OF CONTENTS
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. APPLICATIONS
...................................................................................................... 8
6.SPECIFICATIONS
................................................................................................. 9
7.BLOCK DIAGRAM
................................................................................................ 10
8.DIMENSIONAL DIAGRAM
................................................................................... 11
2
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.
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.
1. SAFETY PRECAUTIONS
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.
3
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.
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
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.
4
3. FEATURES
The pre-amplifier series
is equipped with pre-amplifier. They are designed to suit all PA system application in
schools, Home, offices and stores.
2. GENERAL DESCRIPTION
=
CHIME SIGNAL
1 Selective two tone/four tone chime(Internal setting)
2 Automatic priority
3 Permissible external chime remote and p.t.t remote
=
Master 1,2 output
=
Two band eq per output
=
Signal indicator per input
=
Independent din jack for p.t.t remote
=
Prioriyt switch and phantom of mic 2,3,4
=
Selective mic input of h.p.f
=
Selective output per input signal(output 1,output1+2,output 2)
=
Independent line input with rca pin jack (line 7~10)
=
Recording output
=
Led indicator for master-output
=
AC/DC 24V
5
4. NOMENCLATURE AND FUNCTIONS
2
4.1 FRONT PANEL
1 1+2 2
OUTPUT
OUTPUT
OUTPUT
1 1+2 2
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
0
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
0
0
0
HIGH
LOW
HIGH
+3
0
-3
-8
-13
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
P.T.T 1
CHIME
MASTER
1
LOW
MASTER
2
PRIORITY2
PRIORITY3
PRIORITY4
LINE
MIC
POWER
MASTER VOLUME
1
2
MASTER VOLUME
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
MIC/LINE 2
MIC/LINE 3
MIC/LINE 4
MIC/LINE 5
MIC/LINE 6
MIC/LINE 7
MIC/LINE 8
MIC/LINE 9
MIC/LINE 10
ON
1
4
5
6
7
1. CHIME
Pressing chime switch, chime signal
will be activated as a pre signal. You
can adjust level.
=
OUTPUT SWITCH
This is for selector that send chime
signal to master output.Chime signal
has a priority .when chime signal is
activated, signal output of input 5~10
will be closed.
IMPORTANT NOTICE:
Priority will be
given only for selected output.
2. INPUT1 CONTROLS
Adjust level volume so as not to turn
on +3CLIP LED under two~three o
clock of master volume this is control
For mic input level.
=
OUTPUT SWITCH
This is selector that send signal of
input 1 to the master output.when
input 1 are activated , signal of input
5~10 will be closed.
3. INPUT 2,3,4 CONTROLS
Adjust level volume so as not to
turn on +3LED under two~three o
clock of master volume this is
control for MIC/LINE input closed.
=
OUTPUT SWITCH
This is selector that send signal of
input 2,3,4 to the master output.
when input 2~4 are activated , signal
of input 5~10 will be closed.
=
MODE SWITCH
MIC : It is input mic switch of 300Hz
H.P.F that makes sound
clearance.when you select
Switch , windy sound.
MIC : This is MIC input switch
Without filter line.
LINE : Line input for CD CASSETTE,
TUNER.
IMPORTANT NOTICE:Serecting
mode switch
HPF
flat
power will be supplied to
input XLR connector for condensor
mic only.If you connect unbalanced
dynamic microphone with them,it
May be defaulted and should be
moving to mode switch for noise
Down.
=
PRIORITY 2~4
When you switch
on
, priority is
activated and will closed input 5~10.
4.
INPUT 5~10 CONTROLS
These make adjustment of MIC/LINE
For input 5~10.
Adjust output level so as not to tune
on
CLIP LED under two o
clock.
=
OUTPUT SWITCH
This is selector that send signal of
input 5~10 to the master-output.
When input 1~4 signal and chime
signal are supplied, priority will be
activated and close output of input
5~10.
This is selector that send signal of
input 2,3,4 to the master output
when input 2~4 are activated , signal
of input 5~10 will be close.
=
MODE SWITCH
MIC : It is input mic switch of 300Hz
H.P.F that makes sound
clearance.when you select
Switch , windy sound.
MIC : This is MIC input switch
Without filter line.
LINE : Line input for CD CASSETTE,
TUNER.
IMPORTANT NOTICE:Serecting
mode switch
HPF
flat
power will be supplied to
input XLR connector for condensor
mic only.If you connect unbalanced
dynamic microphone with them,it
May be defaulted and should be
Minimized level volume before
moving to mode switch for noise
Down.
5. EQUALIZER
Adjust low, high if EQ volume
According to condition.
6. MAST 1,2
This is master volume for all input
levels you and better use toward two
o
clock adjust level before clipping
for proper operation.
7. POWER SWITCH
Press to turn ON the power.
Press again to turn the power OFF.
3
6
NOMENCLATURE AND FUNCTIONS
4.2 REAR PANEL
13.MIC/LINE INPUT 2~6
MIC/LINE balanced input can be
selected by mode switch in the front
panel.
IMPORTAN NOTICE:
When you select MIC input,
operating voltage is only for
condensor microphone if you
connect dynamic microphone
balance by mistake, microphone
will be out of work also, be sure not
be insert mic input connector under
level volume-up, speaker systems
may get damage due to big noise.
14.P.T.T. 1
Connect this terminal with microphone
priority and chime controls are
activated from microphone(P.T.T remote)
and Microphone cable with shield
can be extended at the max 30m.
IMPORTAN NOTICE:
Be sure not to make a shorten to the
ground because microphone signal
+, -is for operating power of
condensor microphone.
15.CHIME REMOTE TERMINAL
This is a terminal for chime signal.
8
9
10
11
12
13
14
2
1
3
7
4
52
4
2
GND
PRIORITY
CHIME
LED PWR
MIC INPUT
1
3
5
6
7
1
3
6
REC
LINE 10
LINE 9
LINE 8
LINE 7
L
E
F
T
R
IG
H
T
MIC INPUTS
MIC/LINE INPUTS
P.T.T 1
2
3
4
5
6
7
8
9
10
CHIME
REMOTE
2--OUTPUTS--1
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
15
8. AC POWER
Be sure to check AC voltage. Use
fuse approved.
IMPORTANT NOTICE:Be sure not
to make a shorten for battery and
polarity of battery.
9. DC POWER
DC 24V power input
10.OUTPUTS 1,2
This is master outputs which can be
selected by switch.
11.RECORDING
Recording outputs two L, R
unbalanced RCA jacks are
converted into stereo signals in the
internal circuit from mono signal.
Recording output volume can not be
controlled by master volume
controller because circuit of
recording output controls is just in
the before master volume controls.
12.LINE 7~10
LINE 7~10 unbalanced two L, R
RCA jack are converted into mono
in the internal circuit all line input -
10dB(245mV) input level are for
cassette deck, CD, dat deck, tuner.
7
POWER
24V
2A
5. APPLICATIONS
REAR PANEL CONNECTIONS
2
1
3
7
4
5
2
4
2
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1
3
5
6
7
1
3
6
R
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1
0
L
IN
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9
L
IN
E
8
L
IN
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7
LE
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P
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M
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IN
P
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P
.T
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1
2
3
4
5
6
7
8
9
1
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M
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1
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
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6
M
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2
M
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1
0
M
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7
1
2
3
X
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IN
P
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1
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2
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3
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6. SPECIFICATIONS
MODEL
PRE-AMPLIFIER
PRE-AMPLIFIER
OUTPUT LEVEL/IMPEDANCE
INPUT SENSITIVITY/IMPEDANCE
FREQUENCY RESPONSE
Less Than -0.5dB(20Hz~20KHz)
DIMENSION(mm)
NET WEIGHT
GROSS WEIGHT
484X378X45
6.65Kg
5.52Kg
MIC/LINE: -5dBu(2.45mV)/5Kohms BAL
-10dBu(245mV)/5Kohms BAL
LINE RCA IN: -10dBu(245mV)/10Kohms UNBAL
MASTER 1,2: NOR +4dBu(21.23V)/200ohms BAL
REC: NOR 0dBu(0.775mV)/10K
UNBAL
OUTPUT LEVEL/IMPEDANCE
MASTER 1,2: NOR +4dBu(21.23V)/200ohms BAL
REC: NOR 0dBu(0.775mV)/10K
UNBAL
SIGNAL TO NOISE RATIO
MIC: MORE THAN 60dB
LINE: MORE THAN 0.03%
CROSS-TALK
MIC: MORE THAN 60dB
LINE: MORE THAN 75dB
POWER CONSUMPTION
POWER CONSUMPTION
13W
~120
V 60Hz
9
555-26105
7. BLOCK DIAGRAM
10
~
1
2
0
V
6
0
H
z
1 1+2 2
OUTPUT
OUTPUT
OUTPUT
1 1+2 2
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
0
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
0
0
0
HIGH
LOW
HIGH
+3
0
-3
-8
-13
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
P.T.T 1
CHIME
MASTER
1
LOW
MASTER
2
PRIORITY2
PRIORITY3
PRIORITY4
LINE
MIC
POWER
MASTER VOLUME
1
2
MASTER VOLUME
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
MIC/LINE 2
MIC/LINE 3
MIC/LINE 4
MIC/LINE 5
MIC/LINE 6
MIC/LINE 7
MIC/LINE 8
MIC/LINE 9
MIC/LINE 10
ON
8. DIMENSIONAL DIAGRAM
UNIT:mm
3
378
4
1
400
4
1
REC
LINE 10
LINE 9
LINE 8
LINE 7
L
E
F
T
R
IG
H
T
MIC INPUTS
MIC/LINE INPUTS
P.T.T 1
2
3
4
5
6
7
8
9
10
2
1
3
7
4
52
4
2
GND
PRIORITY
CHIME
LED PWR
MIC INPUT
1
3
5
6
7
1
3
6
CHIME
REMOTE
2--OUTPUTS--1
484
4
5
6
0
100
Over
100
Over
O
v
e
r
1
0
0
UNIT:mm
1 1+2 2
OUTPUT
OUTPUT
OUTPUT
1 1+2 2
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
0
2
3
4
5
6
7
8
10
0
1
9
2
3
4
5
6
7
8
10
0
1
9
0
0
0
HIGH
LOW
HIGH
+3
0
-3
-8
-13
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
P.T.T 1
CHIME
MASTER
1
LOW
MASTER
2
PRIORITY2
PRIORITY3
PRIORITY4
LINE
MIC
POWER
MASTER VOLUME
1
2
MASTER VOLUME
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
MIC/LINE 2
MIC/LINE 3
MIC/LINE 4
MIC/LINE 5
MIC/LINE 6
MIC/LINE 7
MIC/LINE 8
MIC/LINE 9
MIC/LINE 10
ON
11
POWER
24V
2A
Version V0.1
www.mcmelectronics.com
PUBLIC ADDRESS SYSTEM
MCM Custom Audio and Stellar Labs products are warranted, by MCM Electronics,
against manufacturer defects for a period of one year from the original date of
purchase. This warranty is limited to manufacturer defects, in either materials or
workmanship. MCM Electronics, or any other worldwide divisions of
Premier Farnell PLC, are not responsible for any consequential or inconsequential
damage to any other component, structure or the cost of installation or removal
of said items.
For questions or specific information regarding warranty replacement or repair,
please contact: