Show MA-4075 User manual

MULTIZONE PA. MIX POWER AMPLIFIER
NF02651-1.2
MA-4075MA-4075
RR
www.show-pa.com
User's Manual
cc
SEIKAKU TECHNICAL GROUP LIMITED
No.1, Lane 17, Sec. 2, Han Shi West Road, Taichung, 401 TAIWAN
Tel:[phone] Fax:[phone]
http://www.show-pa.com e-mail: [email protected]
All rights reserved to SEIKAKU. All features and content might be changed
without prior notice. Any photocopy, translation, or reproduction of part of this
manual without written permission is forbidden. Copyright 2006 SEIKAKU Group
MULTIZONE PA. MIX POWER AMPLIFIER

IMPORTANT!
Please read this manual carefully before operating
this unit for the first time.
All rights reserved to SHOW. All features and content might be changed
without prior notice. Any photocopy, translation, or reproduction of part of
this manual without written permission is forbidden.

SAFETY RELATED SYMBOLS
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol, wherever used, alerts
you to the presence of un-insulated
and dangerous voltages within the
product enclosure. These are voltages
that may be sufficient to constitute the
risk of electric shock or death.
WARNING
Describes precautions that should be
observed to prevent the possibility of
death or injury to the user.
Describes precautions that should be
observed to prevent damage to the
product.
CAUTION
Operating Conditions
Always install in accordance with the
manufacturer's instructions.
This symbol, wherever used, alerts
you to important operating and ma-
intenance instructions. Please read.
Protective Ground Terminal
AC mains (Alternating Current)
Hazardous Live Terminal
ON:
OFF:
Denotes the product is turned on.
Denotes the product is turned off.
WARNING
Power Supply
Ensure that the mains source voltage (AC
outlet) matches the voltage rating of the
product. Failure to do so could result in
damage to the product and possibly the user.
External Connection
Do not Remove any Covers
Fuse
To prevent fire and damage to the
product, use only the recommended
fuse type as indicated in this manual.
Do not short-circuit the fuse holder.
Before replacing the fuse, make sure
that the product is OFF and disconnected
from the AC outlet.
Always use proper ready-made insulated
mains cabling (power cord). Failure to do
so could result in shock/death or fire. If
in doubt, seek advice, from a registered
electrician.
Within the product are areas where high
voltages may present. To reduce the risk
of electric shock do not remove any
covers unless the AC mains power cord
is removed.
Covers should be removed by qualified
service personnel only.
No user serviceable parts inside.
Unplug the product before electrical storms
occur and when unused for long periods of
time to reduce the risk of electric shock or
fire.
Protective Ground
Before turning the product ON, make sure
that it is connected to Ground. This is to
prevent the risk of electric shock.
Never cut internal or external Ground wires.
Likewise, never remove Ground wiring
from the Protective Ground Terminal.
Disposing of this product should
not be placed in municipal waste
and should be separate collection.
1

Do not install this product near any direct
heat source.
Do not block areas of ventilation. Failure
to do so could result in fire.
Keep product away from naked flames.
IMPORTANT SAFETY INSTRUCTIONS
Read these instructions
Follow all instructions
Keep these instructions. Do not discard.
Heed all warnings.
Only use attachments/accessories
specified by the manufacturer.
Power Cord and Plug
Do not tamper with the power cord or plug.
These are designed for your safety.
Do not remove Ground connections!
If the plug does not fit your AC outlet seek
advice from a qualified electrician.
Protect the power cord and plug from any
physical stress to avoid risk of electric shock.
Do not place heavy objects on the power
cord. This could cause electric shock or fire.
Cleaning
When required, either blow off dust from
the product or use a dry cloth.
Do not use any solvents such as Benzol
or Alcohol.
For safety, keep product clean and free
from dust.
Servicing
Refer all servicing to qualified service
personnel only.
Do not perform any servicing other than
those instructions contained within the
User's Manual.
To avoid the risk of electric shock and
damage, do not subject this product to
any liquid/rain or moisture. Do not use this
product when in close proximity to water.
2

1. Gain knob
this knob controls input gain. Turn the knob clockwise, then the
input increases. Turn the knob counter-clockwise, then theinput
decreases.
2. High knob
This is the treble control. You can use itto get ridof high frequency
noises or toboost the soundof cymbals orthe high harmonics of
the human voice.The gain range goes from -10dB to 10dBwith the
central frequency 10kHz.
3.Low knob
This is theBass control. Boostmale voice orkickdrum and bass guitar. Your
system will soundmuch bigger than what it is. The gain range goes from -10dB
to +10dB andthe center frequency is 100 Hz.
6.VOL knob
This knob controls volume. Turn the knob clockwise, and the volume increases.
Turnthe knob counter clockwise, andthe volume decreases.
7.Zone selector
Z1, Z2,Z3,Z4 can be considered as signal assignment switches. Press the button
Z1 down and signal will be assigned to ZONE 1.Release the button and it stops
Assigning signal to ZONE1. Z2, Z3,Z4 can be operated in the same way.
8. Phone Volume
This knob controls the volume of Phone (refer to 7).Turn the knob clockwise,
and it increases the volume, and vice versa.
9.Phone
The signals of amplifier can be sent to a pair of headphones
through this socket.
10. Monitor Volume
This knob controls the output signal level to monitor output.
The Front panel
1
2
3
Phone
Volume
Monitor
Volume
Phone
8910
3
4. Mute
It mutes the signals from the corresponding channel.
5. Mute LED
When the mute key is pressed down, mute LED lights up, and vice versa.
MON
Phone
Volume
Monitor
Volume
Phone
POWER
VOLUME PL
MA-4075 Multizone PA. Mix Power Amplifier
MON
MON MON
VOLUME
VOLUME VOLUME
MUTE
CH 1 CH 2 CH 3 CH 4 CH 5
MUTE MUTE MUTE MUTE
ZONE 1 ZONE 2
ZONE 3 ZONE 4
Z3
Z1 Z2
Z4 Z3
Z1 Z2
Z4 Z3
Z1 Z2
Z4 Z3
Z1 Z2
Z4 Z3
Z1 Z2
Z4
Zone
Selector Zone Selector Zone Selector Zone Selector Zone Selector
VOL
BASS
TREBLE
GAIN
VOL
BASS
TREBLE
GAIN
VOL
BASS
TREBLE
GAIN
VOL
BASS
TREBLE
GAIN
VOL
BASS
TREBLE
GAIN
ON
OFF
MUTE
CH 1
Z3
Z1 Z2
Z4
Zone
Selector
VOL
BASS
TREBLE
GAIN
5
4
6
7
10
Note: Specification, design andappearance are subject to change without prior notice!
Model: MA-4075
Output power capacity:
Frequency response: 50-17000Hz (-3dB)
Totalharmonic distortion: Less than 0.5%(1KHz-nominal power capacity)
Microphone: Better than 55dB rated output
Line:b etter than 60dB rated output
Inputs / sensitivity-impedance: CH1-3/XLRand 6.3mm combination socket: bal/unbal
Mic: -42dB /-38dB-600ohm,bal/un bal.
Line: -26B/-20dB-15Kohm, bal/unbal.
LINE IN/ stereo RCA jack/ unbalanced
CH4: -10dB 50Kohm
CH5: 0dB 50Kohm
Tonecontrols: Bass 10dB-100Hz
Treble 10dB-10KHz
Outputs for speakers / Ohms: 4 ohm, 8 ohm
Outputs for speakers / Volts: 25V-70V-100V
Monitor output: 1Wrms
Phone output: 0.5W into 47ohm
Line out: 1.2V
Controls: 5 Gain controls for Ch1-5,
7 Volume contr ols forCh1 -5, tel.pagina, monitor, phone
4 Master volume control
5 Treble controls
5 Bass controls
5 Mute controls
4 Zone select switch for each channel
4 Zone monitor select switch.
Indicator: Power indicator
4 Zone output-level meter
1 Monitor output-level meter
5 Mute indicators
Power supply/ Consumption: 115/230 Vac( 5%) -60/50Hz /400VA
Dimensions: 483mm(W) x 132mm(H) x 310mm(D)
SPECIFICATION
Signal/noise ratio:
1 ACselect switch
RMS:40W 4; Peak output: 90W 4

11. Zone1 VOLUME
VOLUME controls the output signal level of ZONE1.
12.LED VU-meter
This stereo 6 segment LED-meter indicates the level of the
overall output signal.
13.MONITOR selector
Push MONITOR button down, then it connects the signal from
amplifier 1 to monitor volume. Release the button, then it cuts off the signal
connection to monitor volume. The other three buttons are operated in the
same way.
14. PL
This LED is the power indicator. When the amplifier ispowered on, this LED
lights up. Whenthe amplifier is powered off, this LED lightsoff.
15. Power switch
When the switch is set in the position ON, the unit is powered
on. When the switch is set in the position OFF, the unit is
powered off.
POWER
ON
OFF
PL 14
15
The Rear Panel
16. Intelligent fan
This is an intelligent fan. When the temperature is below 50 ,
the fan stops running. When the temperature is abov e 50 , it
starts to run and the fan increases running speed as the
temperature is rising.
17. AC Input
This inletconnects the unit with the main power.
18. AC fuse
The fuse protects the alternating current circuit of the unit,
and the fuse can only be replaced in the event of fuse
damage.
16
17 18
4
MON
VOLUME
ZONE 1
1112 13
G+ - +TRG
Monitor
Line Out 1W8
Monitor Priority Tel.Paging
VolumeZone
Main Power
115/230V~50/60Hz
Ch.5
Line
Ch.4
Line
Ch.4
Ch.3 Ch.2
Ch.1
TEL
Phantom
Line Mic
Phantom
Line Mic
Phantom
Line Mic
Zone 1G+ - Com 4825V 70V 100V
Zone 2G+ - Com 4825V 70V 100V
Zone 3G+ - Com 4825V 70V 100V
Zone 4G+ - Com 4825V 70V 100V
AC Fuse:
110-120V:T6.3AL 250V
220-240V:T3.15AL 250V
Caution:
Replace fuse only with same and rated type!
Attention:
Afin de reduire le risque d'incendie remplacer seul par un
fusible de meme type!
Caution:
Toreduce the risk of fire or electric shock. Do not expose
this appliance to rain or moisture. Do not remove cover.
There are no user serviceable parts inside. Refer servicing
to qualified service personnel.
Attention:
Pour reduir les risques d' incendie ou de choc electrique
ne pas exposer a la pluie ou l' humidite. Ne pas enlever
le couvercle.Aucun reglage al' interieur. Pour reparation
consulter une personne qualifiee.
RISKOF ELECTRIC SHOCK
DONOT OPEN
CAUTION : SHOCK HAZARD - DO NOT OPEN
RISK OF FIRE-REPLACE FUSE AS MARKED.
Line Out Bal./Unbal. Power Amp. Output
Line Out Bal./Unbal. Power Amp. Output
Line Out Bal./Unbal. Power Amp. Output
Line Out Bal./Unbal. Power Amp. Output
CAUTION
INSTALLATION NOTES
At alltimes ,the amplifier has tobe operated under appropriate conditions. This
includes that the operation location provided sufficient ventilation and thedevice
can not be exposed to direct sunlight or the direct radiation or reflection from any heat
source. Installing the loudspeaker systems choose a location that gets not affected
by extreme and /or constant vibration or other mechanical oscillation . Also make
sure that the speakers are installed at locations that are free from dust and /or
moisture.
CAUTION
We strongly recommend that you leave the connection of the appliance to the qualifie d
and experienced service technicianwho isspecialized inconnecting electrical
and electronic equipment. Do not take the risk of Electro-shock hazard. To reduce
the risk of Electro-shock, all connections have to be accomplished before it is
permissible to connect the amplifier with the main supply. Before connecting the appliance
to the mains supply, once again make sure that all connections are carried out correctly
and that no short-circuit exist. The overall sound reinforcement installation has to
be in accordance to the laws, regulations, standards, and guidelines that are relevant
and applicable in that country where the equipment is going to be operated.
AC POWER SUPPLY
CAUTION
Before using the amplifier for the first time, make sure that the appliance voltage
is corret. Connect the amplifier only to grounded mains outlets. Connecting the amplifier
to the mains supply (115/230Vac) has to be accomplished by inserting the supplied mains
cord into the corresponding socket .
Speaker
Horn speaker
Microphone
Desk Top Microphone
Sound column
Contact
"VOICE PRIORITY"
Speaker
Aux.signal
Mains
AM/FM tuner
CD player
Cassette recorder
Amplifier
Recorder
9

19. AC Voltage Selector
When the AC Voltage Selector is set to the left 115V, it selects the
power at 100V to 127V. When the AC Voltage Selector is set to the
right 230V, it selects the power at 220V to 240V.
20.Monitor Line Out
Monitor Line Out can be connected with other appliance, such as amplifier, recorder,
etc.
21.Monitor 1W8
The terminal ismeant for theconnection of a small external loudspeaker that
gets driven by an internal auxiliary power amplifier, providing a nominal output
1Watt. Only the mixed audio signal coming from "AUX IN" are included in the
outputted signal. In addition, the output signal is
controlled only bythe volume control of the "CH4",
"CH5", music signal level control.
22."Priority" Terminal.
When these terminals are short-circuit (i.e. By means
of using anelectrical switch), the audio signals coming from "CH2","CH3",
"CH4", "CH5", are attenuated; when the short-circuit are removed all the
signals appear again.
23.Input "AUX Paging"
The terminals input lets you connect to an auxiliary signal . The input features
"Voice Priority" function, which overrides all other input signals once, an auxiliary
message is sent. If you want to have this function disabled forever, please contact
a distributor.
24. a. Zone
There are four dip switches here. Push the dip switch up, it switches off and
vice versa.
b.Volume
It controls the volume of soundsource that is connected to
the "Tel Paging".Turning the knob clockwise
increases the volume of the corresponding source. It is recommend to leave
the control ofmomentarily not used input at their minimal setting "0".
25.''LINE IN" inputs
an audio source with a high level output signal , such as anAM/FM tuner , a
cassette deck, a CD player, etc. Use input sensitivity switch suitable for difference
appliances. They are able to take RCA-type coaxial connectors, and unbalanced
signals.
19
20 21 22 23
24
25
5
Connecting the speakers with 70V output
0 0 0
+ 100V70V25V
COM 4
-
G 8
70V 70V 70V
Connecting the speakers with 100V output
0 0 0
+ 100V70V25V
COM 4
-
G 8
100V 100V 100V
8

26
26.The mono MIC/LINEchannels
These are the channels from Channel1 to Channel4. You
can connect balanced, low impedance microphones to the
XLR socket. On the 1/4" phone jack you can connect either
a microphone ora line level instrument. You shall never
connect an unbalanced microphone lt the XLR socket
if you do not want to damage both the Microphone and
the Mixer.
27. Ch1, CH2, CH3 and inputs sensitivity and XLR phantom switch
By turning the switch onto the "LINE" position the
CH1, Ch2, Ch3 input can be connected to an audio
source with highlevel signal output.By turning these
switches onto the MIC position, CH1, CH2, Ch3 input
can be connected to a dynamic microphone with low
impedance. By turning the switch onto the "Phantom"
position it connects phantom supply for XLR pin2 and pin3
of CH1, CH2, Ch3, which is necessary to operate condenser microphone
which requires this type of external supply. It is recommended to use
this switch with the general volume set on minimum.
28.Line Out Bal/Unbal
These terminals can be connected with other appliance, such as amplifier,
recorder, etc.
29.Power Amp Output
These terminals allow connecting speakers.
27
28 29
6
Total impedance: 4 ohms
+ 100V70V25V
COM 4
-
G 8
+ 100V70V25V
COM 4
-
G 8
Connecting the speakers with 25V output
0 0 0
+ 100V70V25V
COM 4
-
G 8
25V 25V 25V
7
Total impedance: 8 ohms