Redback A4260B User manual

A 4260B
1X120W CLASS D 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.
MADE IN CHINA
A 4260B
1X 12 0W C LAS S D
MI XE R AM PL IF IE R
TF
USB
IR
PUBLIC ADDRESS SYSTEM

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......................................................................................................... 6R
4.3 Rear Panel............................................................................................................... 7
5. OPERATION ILLUSTRATION ................................................................................8
6. TROUBLESHOOTING............................................................................................10
7. APPLICATIONS ..................................................................................................... 11
8.BLOCK DIAGRAM .................................................................................................12
9.SPECIFICATIONS ................................................................................................. 13
10.DIMENSIONAL DIAGRAM ................................................................................. 14

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 ALTRONICS
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.ALTRONICS
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. ALTRONICS
If dust is allowed to accumulate in the unit over
a long period of time, a fire or damage to the unit
may result.
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 product is a mixer amplifier with Bluetooth radio, adopting by combination of high-performance
switching power supply and digital power amplifier, with 1U chassis design, high efficiency, light
weight & delicate appearance.
2. GENERAL DESCRIPTION
5
1. With 1U chassis design, internal combination of switching power supply and digital power amplifier,
higher efficiency, light weight and delicate appearance.
2. With function of MP3 module, can read MP3 files in USB flash disk, TF card. Configure MP3 remote
control; support power-off memory function, MIC recording function.
3. Support 1 channel EMC input, 2 channels AUX input, 4 channels MIC input.
4. Each input has independent volume adjustment with treble, bass, and volume control.
5. The equipment is equipped with level indication, overload and protection indicator, and has good
protection for short circuit, overload and overheat situation.
6. With mute function, microphone input, microphone is prior to line input; mute function, MIC1 is
prior to other audio inputs, EMC takes precedence over all audio inputs.
7. Channel priority function: EMC>MIC1>MIC2/MIC3/MIC4/AUX1/AUX2/MP3.
8. Adopt advanced and high-efficiency power amplify circuit, the speaker output is 100V or 4 ohms;
rated output power is 120W.
9. Input AC power, power supply 180W.
10. It is forced to air-cool from front to the rear, and it rotates at a constant speed when starting up.
It speeds up as the temperature rises and can work for a long time.
11. With 24V power supply interface, DC 24V standby power supply (battery) function is optional.
3. FEATURES

MADE IN CHINA
TF
USB
IR
A 4260B
1X 12 0W C LA SS D
MI XE R AM P LI FI ER
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. Recording function button
2. MP3 loop playback function button
3. Play/Pause
4. Next song/Volume reduce
5. USB interface
6. MIC1 volume control knob
7. MIC2 volume control knob
8. MIC3 volume control knob
9. MIC4 / AUX1 volume control knob
10. AUX2 volume control knob
11. BASS adjustment potentiometer
12. TREBLE adjustment potentiometer
13. Master volume control
14. PROT/100V/4-16 /CLIP/SIGΩ
status indicators
15. The power switch
16. The power indicator
17. TF card slot
18. Previous song/Volume up
19. LCD display
20. Mode function button
15 16
6 7 8 9 10 11 12 13 14
14
1819
5
23
20 17

IN
BATT SUPPLY
DC24V 8A 100V/4-16Ω
OUTPUT
7
4. NOMENCLATURE AND FUNCTIONS
4.3 REAR PANEL
1. AC power input socket
2. 100V/4-16Ω output interface
3. 100V / 4-16Ω speaker output switch
4. Cooling fan
5. Line output interface, used to connect the line input interface
6. 2 channel AUX input interface, used to connect AUX output interface
7. Line input /Mic input /Phantom power switch for MIC4
8. MIC4/AUX1 Balance input
9. Line input /Mic input /Phantom power switch for MIC3
10. MIC3 Balance input
11. Line input /Mic input /Phantom power switch for MIC2
12. MIC2 Balance input
13. MUTE control switch
14. Line input /Mic input /Phantom power switch for MIC1
15. EMC input interface
16. MUTE signal input port
17. FM radio antenna interface
18. MIC1 Balance input
19. 24V DC power interface
1 2 357
4156 8 9 1011 1213 14 16
17
1819

IN
BATT SUPPLY
DC24V 8A 100V/4-16Ω
OUTPUT IN
BATT SUPPLY
DC24V 8A 100V/4-16Ω
OUTPUT
8
5. OPERATION ILLUSTRATION
1.Connect the speakers:
Constant pressure speaker: According to the rated
power of the power amplifier, connect the constant
power speaker
①When the 100V and 4-16Ω selector switch
to 100V position, as shown below:
②When the 100V and 4-16Ω selector switch
to 4-16Ω position, as shown below:
Fixed resistance speaker: 4-16Ω
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 ensure that the equipment and all equipment will be connected are powered off.
②Using the corresponding cable to connect this equipment and other external equipment.
3.Connect the power line and turn it on:
①Please make sure that the power switch of equipment and its connected equipment are
turned off (in the OFF position).
②Turn the volume knob to the left
③Connect the supplied power line to the AC IN interface
④Plug the power line into the applicable socket
⑤Turn on the connected equipment (CD player, etc.), and then turn on the equipment.
Note:
1.Before powering on, please check and make sure there is no problem with the cable and connection.
2.When you turn off the system, turn off the equipment, and then turn off the connected equipment.
4-16Ω100V
SPK- SPK+
4-16Ω100V
SPK- SPK+

9
Note:
1.Turn off the power switch,Please wait about 5 seconds before turning on again.Continuous rapid
turning on and off the power switch,it will lead to equipment failure.
2.Even the switch is in the off status, there will be a little current in equipment. If it won’t use the
equipment in a long time, please unplug the power cord from the wall AC socket.
4.Microphone using:
1.Turning the volume knob to the left,Connect the microphone and microphone input interface.
2.Turning the volume knob in the right position.
3.Facing the microphone and Speak loudly, turn the volume knob to the right, until the output signal
no longer distortion.If input is high but output is low voice, and then increase the volume by using
the volume knob.If the speaker volume is very high, then reduce the volume by using the volume
knob.
5.Shutdown the system:
1.Turning the volume knob to the left until the minimum position.
2.Turning off the panel power switch of the professional power amplifier, at 0ff.In turn shutoff
processor equipment and audio source equipment.
6.Built-in MP3 player operation method:
/
/
/
TFUSB
IR
The buttons are explained as follows:
S.No Buttons Function
/Mode function button; FM / USB / BT / playing (Long press this button to
forcibly turn on / off the machine)
1
/
6
/
2Previous song (long press to increase volume)
3Mp3 loop playback function button; (with Repeat One / Repeat ALL /
Random / Repeat Folder mode.)
4Play / Pause (long press this button in FM mode to receive the station)
5Recording function button; (press this button in PLAYING mode to record)
(Long press the Record button to switch between recording and USB playback)
Next song (long press to decrease volume)
USB function
Press the MODE button to select the USB mode, copy the MP3 file in the U disk (below 32G), and
it supports MP3 / WAV / WMA / AEC / FLAC format.
TF card function
Insert a TF card (below 32G) to copy the MP3 file, and it supports MP3 / WAV / WMA / AEC /
FLAC format.
5. OPERATION ILLUSTRATION

10
5. OPERATION ILLUSTRATION
6. TROUBLESHOOTING
Failure phenomena Failure cause
1. Power switch is not opened
1. Power 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
FM (Radio reception) function
Press the MODE button to select the FM mode, and then long press the PLAY / PAUSE button to
automatically receive the radio station. The radio stations received (depending on the sound
received) depends on the venue.
Bluetooth function
Press the MODE button to select the Bluetooth mode, turn on the mobile phone Bluetooth for
connecting, it can play normally when the mobile phone is 10 meters barrier-free away.
Bluetooth default name is "BP10_BT".
MP3 song loop playback
In USB or TF card mode, play a song at will, press the mode button to switch between REPeat
One / REPeat ALL / Random / REpeat Floder.
Functional memory function
You can turn it off by the remote controller or long pressing the MODE button. After it is turned
on, it can remember the function mode selected before. If you unplug the power cable and turn
it on again, the default is Bluetooth function mode.
Volume +/-
Long press the Previous Song button to increase the volume quickly, and long press the Next
Song button to decrease the volume quickly.

7. APPLICATIONS
REAR PANEL CONNECTIONS
11
IN
BATT SUPPLY
DC24V 8A 100V/4-16Ω
OUTPUT
OPEN
CLOSE
PLAY STOP NEXTPREVIOUS
ON
OFF
POWER
Audio source equipment like CD/MP3 player
MIC
VOL
PLAY MSG
MIC
in
PLAY
SIREN
REC in
ON
OFF
STANDBY
PLAYALARM MODE RECORD
ST OPSTART
Alarm signal generator
Speaker
AC power input

12
8. BLOCK DIAGRAM
MIC1 MIC2 MIC3 MIC4
EMC IN
AUX2AUX1
2-STAGE EQ BA SS TREBLE
LEVEL
MP3/BT MODLE
Protection circuit
LED display
Fun control
Amplifier output
LEVEL LEVEL LEVEL LEVEL LEVEL
MUTE_MIC1
MUTE_ALL
Q2
GND
MUTE_ALL
Q1
GND
MUTE_MIC1
AUDIO OUT
Switchover between 4-16Ω and 100V
DC 24V inverter
power supply
switching
power supply
Amplifier
module

13
9. SPECIFICATIONS
484×295×44mm
180W
4.8Kg
Power Consumption
Dimension
Weight
~240V 50Hz
Voltage
+5℃~+40℃
-20℃~+70℃
<95%(No condensation)
Overheat protection, overcurrent protection, short circuit protection
Forced fan to cool after side entry, boot to start the fan,
and do the variable speed processing infinitely.
MIC1,2,3,4 input:2mV±1mV/600Ω, balanced European
terminal; AUX1,2 input:100mV±20mV/10KΩ, unbalanced
RCA connection terminal; EMC input:775mV±40mV/10KΩ,
balanced European terminal
4-16Ω/100V
A 4260B
120W
MIX OUT: 1000mV/470Ω
unbalanced RCA connection terminal
Bass:±10dB at 100Hz
Treble:±10dB at 10KHz
80Hz~16KHz(+1dB,-3dB)
Power indicator
≥50dB
MIC1、2、3:66dB；AUX1、2:85dB
≤0.05%(at 1KHz，1/3 rated power)
Protection Mode
Operation Temperature
Storage Temperature
Relative Humidity
Cooling Mode
Input Sensitivity
Model
Rated Power
Output Level
Output Sensitivity&
Impedance
Tones
Frequency Response
SNR
THD
Indicator
Cross talk attenuation
S/N Ratio

10. DIMENSIONAL DIAGRAM
14
44
436
Over 100
44
48
484
44
315
6
UNIT:mm
UNIT:mm
Over 100
Over 100
MADE IN CHINA
TF
USB
IR
A 4260B
1X 120 W CL ASS D
MI XER A MP LIF IE R
TF
USB
IR
A 4260B
1X12 0W CLAS S D
MIXE R AMPLI FIER
IN
BATT SUPPLY
DC24V 8A 100V/4-16Ω
OUTPUT

PUBLIC ADDRESS SYSTEM
Version 0.1