B2 Ref 0.5 User manual

HIGH PERFORMANCE AMPLIFIERS
OWNER'S MANUAL

FEATURES
Circuit Configuration
Frequency Response
Signal to Noise Ratio
Input Sensitivity
Crossover
High Pass Filter
Low Pass Crossover Range
Subsonic Crossover Range
Bass Boost
Phase
Output Master / Input Slave
Remote Control
Damping Factor
Power Terminal gauge
Fuse Rating
B2 series output power
POWER @ 4OHM POWER @ 2 OHM POWER @ 1OHM
Ref 0.5 770W x 1 1400W x 1 2650W x 1
POWER @ 4OHM POWER @ 2 OHM POWER @ 1 OHM
Anno 150W x 2 + 270W x 2 260W x 2 + 440W x 2 360W x 2 + 610W x 2
Ref 0.5
Ultra Class D Mono
: 20Hz ~ 250Hz
: 100dB
: 6V ~ 0.2V
: 24dB / Oct
: no
: 20Hz ~ 200Hz
: 10Hz ~ 50Hz
: 0 ~ 9dB
: 0 ~ 180 Degree
: YES
: YES
: 250<
: 0 ga x 1
: 250A
( Linked : 500A )
All features are subject to change in the continuing effort to improve the products without notice
1. FEATURES
2. DESIGN FEATURES
1) Ref 0.5 will allow stable operation as a single unit @ 4/2/1 ohms impedance.
Ref 0.5 will allow daisy chain connections @ impedances down to 2 ohms.
2) Anno 4 channel 1 ohm stable class AB amplifier will allow stable operation @ 4/2/1 ohms stereo
or 4/2 ohms mono.
3) B2 amplifiers offer an advanced protection circuit for the benefit of the user.
Speaker short circuitry, DC offset, Voltage sensor & thermal protection.
4) The B2 pcb has been designed using a double sided board and features high current mosfet
switching devices.
Ref 0.5 has a 24 dB slope/Oct low pass & subsonic filter.
Anno has a 24 dB slope/Oct high pass and low pass filter
5) Ref 0.5 & Anno offer wired remote level control which allows easy gain adjustment from
the drivers seat.
6) Ref 0.5 can be used in a daisy chain connection. This will allow bridging of 2 mono amplifiers
@ 2 ohms to produce twice the power of one unit @ 1 ohm
Anno
4ch 1 ohm Stable class AB
: 20Hz ~ 30KHz
: 105dB
: 8V ~ 0.2V
: 24dB / Oct
: 15(150)Hz ~ 400(4K)Hz, x1, x10
: 40(400)Hz ~ 400(4K)Hz, x1, x10
: NO
: NO
: NO
: NO
: YES
: 500<
: 0 ga x 1
: 240A ( External Fuses )
B2 has through years of dedication introduced our line of Ref 0.5 & Anno amplifiers.
The B2 line up are made to fullfil our philosophy for amplifiers; A variety of applications, highest
possible efficiency and great appearance.
controller chipsets, efficient power devices, precise thermal management and the best engineering
are the cornerstones of the B2 amplifier series.
The B2 amplifiers are designed to produce high power levels even from stock electrical systems.
High efficiency is created from updating every stage through the amplifiers' circuit. High speed

INPUT
Connect preamp signal cables from
the headunit to RCA Input of Ref 0.5.
OUTPUT
Output RCA for signal routing to another amplifier.
POWER & PROTECTION INDICATOR
Power BLUE, Green-lit shows correct operation
Protect LED, RED-lit shows general malfunction,
faulty connection or thermal protection
GAIN ( 6V ~ 0.2V )
Matching the output voltage of the headunit's
RCA line-outs to Ref 0.5 input section.
SUBSONIC FILTER ( 10Hz ~ 50Hz @ 24dB/Oct )
Adjusts the subsonic cut off point to eliminate low
frequencies.
BASS BOOST
Variable bass boost from 0-9 dB @ 45 Hz
REMOTE LEVEL CONTROL PORT
Connection of external level control.
LOW PASS FILTER ( 35Hz ~ 250Hz @ 24dB/Oct )
Adjusts the cut off point for the low pass filter.
PHASE CONTROL
Variable phase adjustment from 0-180 degrees.
OUTPUT MASTER / INPUT SLAVE
For daisy chain connection of 2 Ref 0.5 amplifiers
down to 2 ohms.
3. CONTROL & CONNECTION
3-1. Ref 0.5 CONTROL & CONNECTION
3-2. Quattro CONTROL & CONNECTION
INPUT
Connect preamp signal cables from
the headunit to RCA Input of Anno.
GAIN ( 6V ~ 0.2V )
Matching the output voltage of the headunit's
RCA line-outs to Anno input section.
HIGH PASS FILTER ( 15Hz ~ 400Hz @ 24dB/Oct )
Adjusts the cut off point for the high pass filter.
The wide frequency range allows for "Active" speaker
operation.
X1, X10 ( HIGH PASS FILTER MULTIPLY )
It makes High pass filter frequency range 150Hz to
4KHz
HIGH PASS FILTER SELECTOR ( ON-OFF )
It selects ON - OFF for high pass filter activity
It sets ON, High pass filter is active
But It sets OFF, High pass filter is not avtive
LOW PASS FILTER ( 40Hz ~ 400Hz @ 24dB/Oct )
Adjusts the cut off point for the low pass filter.
X1, X10 ( LOW PASS FILTER MULTIPLY )
It makes High pass filter frequency range 400Hz to 4KHz
LOW PASS FILTER SELECTOR ( ON-OFF )
It selects ON - OFF for Low pass filter activity
It sets ON, Low pass filter is active
But It sets OFF, Low pass filter is not avtive

REM ( REMOTE )
Connect to switched +12V with trigger from head unit.
SPEAKER OUTPUTS
Amplifier connection to loudspeakers.
Minimum speaker cable is 12 gauge.
Ref 0.5 minimum impedance is 1 ohm if used as
a single unit.
Ref 0.5 in linked mode offers stable opearation to
a minimum of 2 ohms.
Anno minimum impedance is 1ohms stereo or
4/2 ohms mono
GND ( GROUND CONNECTION )
For connection to the chassis' ground.
For optimum performance 0 gauge cable is
recommended.
+12V ( POWER CONNECTION )
For connection to the positive terminal of the
battery (+12). For optimum performance
0 gauge cable is recommended.
3-3. Ref 0.5 & Anno CONTROL & CONNECTION
4. INSTALLATION
If you chose to install the B2 series by yourself, please read the owners' manual carefully.
Before you start your installation, please take all steps into consideration. Otherwise, please go to
www.b2-audio.com for authorized distributors or contact us directly for support.
4-1. MOUNTING PREPARATION
Disconnect the negative ( ) battery cable before mounting B2 series or making any connections.
Check the battery and alternator ground ( ) connections.
Make sure they are properly connected and free of corrosion. Before selecting a mounting location
for the amplifier, please take cooling and safety into consideration.
4-2. MOUNTING PREPARATION
B2 amplifiers have been designed with a good heat radiation heatsink to avoid excessive heat
from the amplifier circuitry. For optimum heat radiation performance, it is recommended to
find a mounting location that allows for vertical installation of the heat sink fins.
REMOTE LEVEL CONTROL PORT
Connection of external level control.
POWER & PROTECTION INDICATOR
Power BLUE, Green-lit shows correct operation
Protect LED, RED-lit shows general malfunction,
faulty connection or thermal protection

FUSE
250A
Ground
Remote turn on
Main Battery
12V
Headunit
+12V, GND, REM CONNECTION DIAGRAM
For safety purposes, install the amplifier in a dry and well ventilated location and
make sure no cables or other harness of the car is interfaced with the mounting location or
will present a hazard to the cars' cable, control cables, fuel lines/tanks, hydraulic lines or other
components of the vechicle.
4-3. +12V, GND, REM CONNECTION
12V ( POWER CONNECTION )
Before mounting B2 amplifiers, disconnect the negative ( ) wire from the battery to protect
any accidentIal damage to the amplifier or the audio system.
B2 series are designed to use 0 AWG power and Ground connection.
Connect the power cables to power terminal labeled as + 12V
Ref 0.5 & Anno are not equipped with Fuses. So you should use extral fuses.
connect one end of the fuse holder to the power cable and the other end of the fuse holder to
positive battery within 20 cm of the same cable.
This fuse location will protect the system and the vehicle against the possibility of a short circuit
in the power cable. Be sure to use fuses and a fuse holder adequate for the application
GND ( GROUND CONNECTION )
Locate a secure grounding connection as close to the amplifier as possible.
Make sure the location is clean and provides a direct electrical connection to the frame
of the vehicle. Connect one end of a short piece of the same size cable as the power cable
to the grounding point. Run one end of the cable to the grounding point.
Run the other end of the cable to the mounting location.
Connect the ground cable to the screw terminal labeled as GND.
REM ( REMOTE CONNECTION )
Run a remote turn on cable from the switched + 12V source.
This may be a toggle switch, a relay, or your source unit's remote trigger cables, or power antenna
trigger cable.
Connect the remote turn on cable to the power terminal labeled as REM.

CAUTION
Ref 0.5 minimum impedance is 1 ohm.
or
Ref 0.5 Linked minimum impedance is 2 ohm
Ref 0.5 SPEAKER CONNECTION DIAGRAM i
4-4. SPEAKER CONNECTION
B2 amplifier series recommends 12 AWG speaker connecting cables.
Run 12 AWG speaker connecting cables from your speakers to amplifiers' mounting location
Keep speaker cables away from power cables and B2 series amplifier's input cables.
Use grommets anywhere the cables have to pass through the holes in the metal frame or sheet
metal. Connect to the speakers according to terminals on each speaker.
Strip 3/8" of insulation from the end of each cable and twist the cables strands tightly.
Make sure there are no stray strands that might touch other cables or terminals and cause
a short circuit.
Crimp spade lugs over the cable ends or tin the ends with solder to provide a secure termination.
Connect the cable ends to B2 series amplifiers as show on the speaker system diagram.
Anno SPEAKER CONNECTION DIAGRAM ii
8 ohm ~
2ohms
8 ohm
~ 2ohms
8 ohm
~ 1ohms

Tweeter
Passive
MidRange
/Bass
Passive MidRange
/Bass
Tweeter
Tweeter
8 ohm
~ 2ohms
Passive MidRange
/Bass
8 ohm
~ 2ohms
Passive
Tweeter
MidRange
/Bass
Passive MidRange
/Bass
Tweeter
Anno SPEAKER CONNECTION DIAGRAM i
Anno SPEAKER CONNECTION DIAGRAM ii
Anno SPEAKER CONNECTION DIAGRAM iii

HeadUnit
Ref 0.5 MASTER AMPLIFIER
4-5. Ref 0.5 DAISY CHAIN CONNECTION
Daisy chain connection allows linking of 2 mono amplifiers to work as 1.
Please read the following connection diagram cautiosly to ensure the correct connection.
Step 1. Connect the master Ref 0.5 amplifier to the head-unit and set its output master
and input slave switch to output master position.
Step 2. Connect the master and slave Ref 0.5 amplifier in daisy chain Rca jack as shown
in the diagram.
Step 3. Set slave Ref 0.5 amplifier output master & input slave switch to slave input position.
Step 4. Connect speaker cable ( + ) on master Ref 0.5 amplifier to subwoofer ( + )
Step 5. Connect speaker cable ( + ) on slave Ref 0.5 amplifier to subwoofer ( )
Step 6. Connect speaker cable ( ) on master Ref 0.5 amplifier to speaker cable ( ) on slave amplifier
Ref 0.5 Minimum daisy chain connection impedance is 2 ohm
Do not use daisy chain connection in 1 ohm
Ref 0.5 SLAVE AMPLIFIER

Ref 0.5 Minimum daisy chain connection impedance is 2 ohm
Do not use daisy chain connection in 1 ohm
CAUTION
FUSE
500A
Main Battery
12V
Headunit
GROUND
8 ohm
~ 2ohms
Ref 0.5 working Voltage is 9V ~ 16V.

5. TROUBLE SHOOTING TIPS
NO SOUND ( NO OUTPUT )
@ Pls check all connections, cables' rounting, short, voltage at Ref 0.5 & Anno amplifiers
and headunit
@ Pls check fuses ,If it is blown, pls replace with new ones.
@ Pls check whether speakers are functional. You can connect a AA battery to the speaker
terminals to see if there is any movement of the speaker cone.
PROTECTION
@ Pls check overload, overheat ( thermal ), short and voltage. DC offset
@ Minimum working impedance is 1 ohm for single Ref 0.5 amplifiers or 2 ohm for linked operation.
Anno minimum working impedance is 1 ohm stereo or 2 ohm mono
@ If Ref 0.5 & Anno amplifiers are shut down due to overheat, they will start up again after
a short cooling period.
Please allow for better airflow and ensure there's no obstruction around the Ref 0.5 & Anno for
thermal protection
@ Ref 0.5 has Low and high voltage protection. Working Voltage is 9V~16V.
Voltage lower than 8.5V or higher than 16V will cause the amplifier to go into protect.
@ When over 4V DC comes into B2 series amplifiers, then, they will be DC protected.
Check whether B2 series amplifiers work after removing RCA-Input
If B2 series amplifiers are functional, then check DC by checking RCA-input L and R
When DC is over 4V at input, try by replacing headunit or source unit
DISTORTION
@ Adjust the input level and check the quality of the speakers. Replace low quality speakers
with upgraded ones.
POOR BASS RESPONSE
@ Pls check speaker cables and reverse the polarity of one channel
BUZZING SOUND
@ Check the amplifier and the head unit ground and ensure it has a good clean connection
@ Check the Rca jack and replace it if faulty or try rerouting it.
WHINING NOISE
@ Engine noise is caused by poor grounding of B2 series amplifiers, headunit, other
components, battery or alternator, so pls check all grounding connection.