Epcom PROAUDIO SFB120 User manual

SFB240
MIXER AMPLIFIER
OPERATION 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.
PUBLIC ADDRESS SYSTEM
SFB120
MIXER AMPLIFIER
SFB120
USB
SD
SD/ M E D I A
MODE
MIC1 INPUT
MASTER
10 0
MIC 1
10 0
AUX 1
10 0
AUX 2
10 0
POWER
PROT
100V
70V SIG
CLIP
OL
ON
OFF
BASS
+10-10
TREBLE
+10 -10

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 emote control......................................................................................................... 6
4.3 Rear Panel............................................................................................................... 7
5. OPERATION ILLUSTRATION ................................................................................8
6. ............................................................................................11
7. APPLICATIONS ..................................................................................................... 12
8.BLOCK DIAGRAM .................................................................................................13
9.SPECIFICATIONS ................................................................................................. 14
R
TROUBLESHOOTING

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.
EPCOM
EPCOM
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
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.
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.
EPCOM
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
Due to product upgrades, while some of the features and specification in the user manual does not
match the actual functions, sorry for any inconvenience and thanks for your kind understanding!

This is a mini desktop constant pressure amplifier, with beautiful appearance, light weight, easy
to carry, and it can be used for background music and radio in family, leisure cafes, classrooms,
and other small indoor venues.
2. GENERAL DESCRIPTION
1. With desktop design, beautiful appearance, light weight, and easy to carry.
2. It can be used for different sound effect places. This series including 120W and 240W.
3. Super sound quality and high definition, switching options can be connected to 70V or 100V output,
and to provide beautiful sound for long distance broadcast.
4. The output terminal uses standard 6.3 audio microphone jack and line input use RCA jack, to provide
users with different audio input interface options.
5. 1 channel microphone input with independent volume control.
6. 2 channel line inputs with independent volume control. And also with EMC input.
7. With function of auto play MP3 and power off memory.
8. With priority function, when MIC 1 input, the other audio signal can be disconnected.
9. With power indicator, the machine has a signal indicator, overload, protection indicator, and 70V,
100V output switch indicator.
10. With function of short circuit, overload and over temperature protection.
11. With function of MP3 module, can read MP3 files in USB flash disk, SD card, support for Bluetooth
of mobile phones and FM radio.
5
3. FEATURES

4. NOMENCLATURE AND FUNCTIONS
6
4.1 FRONT PANEL
1. Power switch
2. Mode
3. Previous/next
4. Volume increase/decrease
5. 0~9 number button
6. Play/pause
7. Sound effect control
8. Mute
9. Cycle play button
10. Pause
Remote control usage attention:
1. When install battery, please mind electrode.
2. Please let remote control aim right with window of host machine.
3. When found remote distance get short and insensitive, please change battery.
4. Please take out battery when don't use it for a long time.
5. Take it easy in case of falling.
Normal usage distance of remote control:
Remote control distance: 8 meter, angle: level ±35, vertical 15.±
4.2 Remote control
MODE E Q
STOP
1
2
3
4
5
6
7
8
910
1. MIC1 input
2. SD/MMC card port
3. Previous track/volume down
4. Play/Pause
5. Next one/volume up
6. Mode selection
7. BASS adjustment potentiometer
8. TREBLE adjustment potentiometer
9. Master volume control
10. The Power switch
11. Power indicator light
12. PROT/100V/70V/OL/CLIP/SIG
status indicators
13. AUX2 volume control knob
14. AUX1 volume control knob
15. MIC1 volume control knob
16. LED display
17. USB interface
USB
SD
SD / M E D I A
MODE
MIC1 INPUT
MASTER
10 0
MIC 1
10 0
AUX 1
10 0
AUX 2
10 0
POWER
PROT
100V
70V SIG
CLIP
OL
ON
OFF
BASS
+10 -10
TREBLE
+10 -10
137
456 8 9 10
11
13
14
1516
17 12
2

EMC IN
AUDIO AUX2 AUX1
OUTPUT INPUT
70V/
100V
OUTPUT
COM COM COM
MUTE FM ANT
G
+
70V100V
7
4. NOMENCLATURE AND FUNCTIONS
4.3 REAR PANEL
18 19 21 2220
2324252627
18.
19. Cooling fan
20. 100V / 70V speaker output switch
21. MUTE mute control
22. FM radio antenna interface
23. AUX1 input interface, used to connect AUX output interface
24. AUX2 input interface
25. Line output interface, used to connect the line input interface
26. EMC input interface
27. 100V/70V output interface
AC power input socket

8
5. OPERATION ILLUSTRATION
1.Connect the speakers:
①When the 100V and 70V selector switch to
70V position, as shown below:
②When the 100V and 70V selector switch to
100V position, as shown below:
70V/
100V
OUTPUT
COM COM COM
Maximum output voltage: 70V
SPK- SPK+
70V100V
70V/
100V
OUTPUT
COM COM COM
Maximum output voltage: 100V
SPK- SPK+
70V100V
Note:
1. Before connecting the speakers, please make sure that the equipment is powered off. In the
case of power on, may have the risk of electric shock.
2. Please make sure there are no applied load to the speaker cables.
3. During the installation of speakers, please make sure that the sum of the rated input power
of the speakers to be connected is less than rated power of equipment.
2.Connect external devices
①Please make sure this amplifier and other equipment to be connected are turn off.
②Please use the correct cable to connect with external equipment.
:
3.Connect the power cord and turn on:
① Please make sure the power switch is off when connect the equipment.
② Turn the volume knob to the counterclockwise.
③ Connect the power cord with AC IN interface, turn on the power switch.
④ Turn on the other equipment firstly (CD player, etc), then turn on this amplifier.
Note:
1. Please check carefully to make sure the correct connection before turning on power.
2. Please turn off this amplifier firstly, and then turn off other equipment.

9
5. OPERATION ILLUSTRATION
6.
USB and SD Card interface will automatically give playback priority to inserted media. When
media is inserted, LCD displays "USB" or "SD" on screen for a few seconds, and then shows the
track ID and playback time.
②"MODE" button: press the "MODE": choose radio, Bluetooth or audio playback
③" " If press quickly,it is last song;Long press is the volume decrease.
④" " When playing music,press one time quickly is pause,press again is play.
⑤" " If press quickly,it is next song;Long press is the volume increase.
Built-in MP3 player operation method:
.
①
button:
button:
button:
Note:
1.When using the built-in MP3 player,please avoid pressing the control buttons too
firmly.Pressing buttons with excessive force might damage them.
2.When inserting an SD card or USB memory stick,please insert them with minimal
force and oriented the right way.This will prevent damage to the interface sockets.
USB
SD
SD/M E D I A
MODE
4.Connecting Microphones:
①Turning the volume knob to the left for minimum volume. Plug the microphone into the micro-
phone connector of the pre-amplifier, and then connect the OUTPUT of the pre-amplifier into
the INPUT connector on the rear panel of the amplifier .
②Turning the volume knob in the right position.
③Speak loudly into the microphone and turn the volume knob counterclockwise (to the left), until the
output signal no longer distorting. If input is high but output is low, then increase the volume by turning
the volume knob on the amplifier counterclockwise (to the right). If the speaker volume is very high, then
reduce the volume by turning the knob to the left.
Note:
1. After turning off the power switch, please wait about 5 seconds before turning it on again.
Repeated and frequent turning the power switch on and off may result in equipment failure.
2. When the power switch is off, a little current will remain in the equipment.
3. If the amplifier is not going to be used for an extended period, please unplug the power cord
from the wall AC mains socket.
5.Shut down the system:
①Turn the amplifier volume knob counterclockwise until in the minimum position.
②Press the amplifier panel power switch to the off position. Then switch off the connected
processor equipment and audio source equipment.

10
5. OPERATION ILLUSTRATION
7.Mobile phone Bluetooth connection method:
Press the MODE button on the MP3 player to set the module to Bluetooth mode. The LCD will
display "bt" on screen, and while in Bluetooth mode, this mark will always be present. As soon
as you enter "bt" mode the device is ready to pair and sync with another Bluetooth device in the
vicinity.
Activate Bluetooth on your mobile device (phone or tablet or laptop). Check the mobile device
for any newly scanned devices. The Bluetooth label for the SFB120/SFB240 is "PA-02086".
If that device shows up on your mobile devices list, then select it and begin the pairing process.
Once the new "bt" playback device is connected, you can commence playing songs and audio
podcasts from your phone through the amplifier module.
⑤Transport controls on the MP3 player are in sync with the phone. Press "Play/Pause" on the
module and the mobile device will play or pause. Press "Next" or "Previous" and the current
track will restart. You can also change the audio playlist from the phone, as well as pause,
skip etc.
8. MP3 module recording function description:
Insert SD card or USB device into the corresponding interface of MP3 module.
Press the "Play/Pause" ( ) button on the MP3 module for 3 seconds to enter the recording
mode, as shown by "REC" on the LCD screen. The recording onto whichever media is available
begins immediately the timer starts to count up. Only the connected audio sources (Mic 1- 4,
Aux 1-2) that have volume up will be recorded in the Master mix recording.
After recording ends, press "MODE" button to save and start to play the recording file.
User can press the last song and the next song button to play the required recording file.
9. FM Playback mode
Connect the FM antenna wires to the "FM ANT" sockets on the rear of the unit. Place the
antenna wire close to a nearby window to optimise signal reception.
FM mode is the default mode when the amplifier is first switched on, unless a USB or SD card
is inserted. If either of these media is inserted during FM playback, the mode will switch to
that media and commence playback automatically. Press the mode button repeatedly to return
to FM Tuner mode, which is indicated by the appearance of an FM frequency on the LCD screen.
Press "Play/Pause" ( ) on the MP3 player to start the automatic search for FM Frequencies.
The search will stop on any strong signal that it can pick up and commence playback. Press
“Play/Pause” again to restart the search, which proceeds in one direction from lower to higher
FM frequencies.
To tune to an FM station manually in 1MHz steps, use the "NEXT" or "PREVIOUS" arrow button
on the MP3 player until you find the desired frequency.
①
②
③
①
②
③
①
②
③
" "
:
④
④
④

11
6. TROUBLESHOOTING
Failure phenomena Failure cause
1. Power switch is not opened
1Power line is cut off
2. The protection function of the equipment is
not activated
.
2. All lines are connected, but there is
no sound.
1. The power switch is not opened or the power
plug is bad contacted.
2. The fuse is burnt
3. The volume knob is not opened or turned down
to a extra low level
4. There is no audio signal input
5. There is short-circuit in the speaker line.
3. The sound suddenly disappears in
normal status.
1. The equipment is in very high temperature to
make it into protection status.
2. The connection wire is bad contact.
4. Low sound
The equipment is set to be low impedance
connection, but the speakers connected is
with high impedance.
5. Sound is distorted The input level of Mic or external equipment
is too high

EMC IN
AUDIO AUX2 AUX1
OUTPUT INPUT
70V/
100V
OUTPUT
COM COM COM
MUTE FM ANT
G
+
70V100V
7. APPLICATIONS
REAR PANEL CONNECTIONS
12
AC Power Input
70V/100V Speakers
MIC1 Input
CD PLAYER
CD PLAYER
MIXER AMPLIFIER
External FM antenna
VOL
PLAY
MSG
MIC
in
PLAY
SIREN
REC in
ON
OFF
STANDBY
PLAYALARM MODE RECORD
STOPSTART
ALARMING SIGNAL GENERATOR

13
8. BLOCK DIAGRAM
Amplifier output
MIC1
ENC IN
AUX2AUX1
2-STAGE EQ BASS TREBLE
LEVEL
MP3/BT MODLE
120W/240W
LEVEL LEVEL LEVEL
MUTE_MIC1
MUTE_ALL
Q2
GND
MUTE_ALL
Q1
GND
MUTE_MIC1
AUDIO OUT
LEVEL LEVEL
D isplay
Protection circuit
LED display
Fun control
Amplifier
module
Switchover between 70V and 100V
DC 24V inverter
power supply
switching
power supply
Remote control Button

9. SPECIFICATIONS
14
Dimension
Weight
Power Consumption 400W
300×88×280mm
4.1Kg
200W
3.9Kg
MIC input: + 5mV, unbalanced 6.3 connector
AUX input: 350mV, unbalanced RCA connector
70V/100V
Speaker Output
Input Sensitivity&
Source Impedance
Rated Power Output
Model SFB240
240W
Frequency Response
≥75dB
Rated power output, distortion ≤ 1%
MIC 1 has the priority than other input
S/N Ratio
T.H.D
Priority function
Bass: 100Hz±10dB，Treble: 10KHz±10dB
Tone
80Hz~16KHz(-3dB)
SFB120
120W
Short circuit, overload and overheating protection.
Protection
~110V 60Hz
Input power

PUBLIC ADDRESS SYSTEM
VersionV0.1