B2 Audio Zero.5 Owner's Manual

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B2 Audio Zero.5 Owner's Manual | Manualzz

MODEL: Zero.3 Product id:ZERO3D13




We congratulate you with your decision to purchase our reveered niche amplifiers.

Every product developed by implements the keystones of our company philosophy;

Optimum sound reproduction within its range, etter ass & high performance.

These elements will enable you to reproduce music the way you prefer.

Our amplifiers features a unique design, a variety of applications & highest possible effiency combined with a clean analytical sound.

To obtain the full potential of the amplifier, it is strongly recommended & necessary to upgrade the stock electrical system in order to operate correctly & minimize failure.

It is therefore essential to read through the whole manual to ensure optimum operation.

Installation can preferably be carried out by an authorized dealer.

Visit us at: www.b2audio.com & www.facebook.com/b2audio for further info & updates.

Interested in competing? As a proud industry member of dB Drag Racing & IASCA you can easily get started. Visit www.termpro.com & www.iasca.com for information.

Better Bass

Better Bass is our philosophy of adding something extra.

Keep in mind that continious exposure to SPL above 100 dB can seriously damage your hearing. Today’s high power auto sound systems can easily produce SPL over 140 dB. Enjoy your music with sense.

Table of contents

1. Design features ....................... 3

2. Panel layout ............................ 4 - 5

3. Installation ............................. 6 - 8

3.1 Installation considerations ...... 6

3.2 Power connectors .................. 6

3.3 Wiring layout ........................ 7

3.31 Speaker wiring diagram ....... 8

4. Troubleshooting ...................... 9


1. Design features


Circuit Configuration

Frequency Response

Signal to Noise Ratio

Input Sensitivity

Input Level Selector


Low Pass Crossover Range

Subsonic Crossover Range

Bass Boost

HI-EF Class D Mono

: 15Hz ~ 250Hz

: 100dB

: 6V ~ 0.2V

: -

: 24dB / Oct

: 35Hz ~ 250Hz

: 10Hz ~ 50Hz

Bass Boost frequency

: 0 ~ 9dB

: 30 ~ 80Hz

Phase : 0 ~ 180

Remote Control w/clip indicator

Damping Factor

Power Terminal gauge

Fuse Rating


: 300>

: 0 ga x 1

: 180A

All features are subject to change in the continuing effort to improve the products without notice.


Continious output power rating (RMS)


Power @ 4 Power @ 1

(12V < 1% THD)

Power @ 4 Power @ 2 Power @ 1

(14,4V >= 1% THD)

500 W x 1 1000 W x 1 2000 W x 1

Specifications (detailed)

1) The


operates stable @ impedances of minimum 1 mono.

- Running the amplifer at that impedance sets requirements to both ventilation & the battery system.

Operation below minium impedance will void the warranty.

2) The amplifier has a 4 stage advanced protection circuit;

-Thermal protection, Voltage sensors, DC offset & short circuitry via speaker outputs.

3) The


utilizes a double sided SMD pcb & high current mosfet switching devices in both the in- and output stage.

4) wired remote level control with clip indicator is included with the amplifier.

- This unit will enable remote gain adjustment.

- For more advanced features like selectable bass frequency, boost level & gain,


Better Bass Remote

(optional) can be used.

5) The crossovers of the


are variable 24 dB/octave filters for both low pass & subsonic.


2. Panel layout






0dB 9dB 30Hz 80Hz






Signal input from the head unit. A minimum level input of 0.2V is essential for correct operation.


Power LED, Blue-lit shows correct operation.

Protect LED, Red-lit shows general malfunction, faulty connection or thermal protection.

GAIN (6V ~ 0.2V)

Matching of the output voltage from the head unit’s

RCA line-outs to the input section.

SUBSONIC FILTER (10Hz ~ 50Hz @ 24dB/Oct)

Adjusts the subsonic cut off point to eliminate frequencies within the filter’s range.


Amplifier connection to the loudspeakers.

Minimum speaker cable is 12 gauge.

Minimum impedance for the


is 1 if used as a single unit.

In a daisy chain configuration the minimum

impedance is 2 .


Variable bass boost with 0-9dB.


Variable bass boost frequency from 30Hz ~ 80Hz

LOW PASS FILTER (35Hz ~ 250Hz @ 24dB/Oct)

Adjusts the cut off point for the low pass filter within the filter’s range.


Variable phase adjustment from 0-180 degrees.


Connection of external level control.

(The Better Bass Remote can be connected for additional features).


For daisy chain connection of 2 Zero.3 amplifiers.

Minimum impedance is 2 .

Output signal can be routed from 1 master amplifier to 2 slave amplifiers, by setting the switch to SLAVE1

& SLAVE2 on the amplifiers in question.



2. Panel layout



For connection to the chassis’ ground.

For optimum performance 0 gauge cable is


For optimum performance 0 gauge cable connected with cable of equal length.


Connect to switched +12V from the head unit.


in the folling steps:

1. Ensure that the ground is appropriate, then connect it to the amplifier.

2. Next step is to connect the +12V wire. Ensure all power terminals are used.

This cable has to be fused at the battery & the amplifier for safety precautions.

3. The final step is connecting the switched remote.

4. Operation over 15V will cause the amplifier to go into protect mode.


3. Installation

3.1 Installation considerations

If you choose to install the amplifier by yourself, please read the owner’s manual carefully.

Before you start your installation, please take all steps into consideration.

If in doubt, please go to www.b2audio.com for authorized distributors / dealers that will be able to

configure your set up & ensure warranty of your amplifier.


Disconnect the negative (-) battery cable before mounting or making any connection.

Check the battery & alternator ground (-) connection. Make sure they are properly connected/dimensioned

& free of corrosion. Before selecting a mounting location for the amplifier, please take cooling & safety

into consideration. Avoid areas with excessive vibration & up side down installation!

Our amplifiers have been designed with a good heat dissipation heatsink.

In order to avoid excessive heat from the amplifier, it is recommended to find a mounting location

that allows for vertical positioning of the heatsink fins.

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 car’s

cable, control cables, fuel lines/tanks, hydraulic lines or other components of the vechicle.

3.2 Power connectors

12V (Power connection)

Before mounting the amplifier, disconnect the negative (-) wire from the battery to protect any accidental damage to the amplifier or the audio system. The amplifier is equipped with 0 AWG power & ground terminals. It is crucial that all terminals are used with the adequate cable to ensure correct operation.

Connect the power cables to the power terminal labeled as +12V.



is not equipped with fuses, so external fuses are required.

Connect one end of the fuse holder to the power cable and the other end of the fuse holder to the positive battery terminal 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.

Make sure that the fuses and the fuse holder is adequate for the desired application.

GND (Ground connection)

Locate a secure grounding connection as close as possible to the amplifier.

Make sure the location is clean and provides a direct electrical connection to the chassis of the vehicle.

Connect one end of an equal sized cable as the positive cable to the location of ground.

It is important that the ground cable is as short as possible, but no longer than 75 cm at maximum.

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 terminals labeled as GND.


Run a remote turn on cable from the switched +12V source.

This may be a toggle switch, a relay, the source unit's remote ouput cable or power antenna trigger cable.

Connect the remote turn on cable to the power terminal labeled as REM.


3.3 Wiring layout

+12V, GND, REM connection chart

Head unit


Remote turn on

180A (External fuses)

We recommend using 12 AWG speaker cables to obtain increased performance.

Run 12 AWG speaker cables from your speakers to the amplifier’s mounting location

Keep the speaker cables seperate from the power cables and and the amplifier’s input cables.

Use grommets where the cables have to penetrate the vehichle’s chassis.

Connect the speaker wires according to the terminals on each speaker.

Strip 3/8" of insulation of the end of each cable and twist the cables strands together tightly.

Make sure there are no stray strands that might touch other cables or terminals and cause a short circuit.

Crimp spade plugs over the cable ends or tin the ends with solder to provide a solid terminal.

Connect the cable ends to the amplifer as shown in the speaker wiring diagram.


3.31 Speaker Wiring Diagram



The minimum impedance as 1 unit is 1 .

In a daisy chain configuration the minimum

impedance is 2 .

Speaker Impedance 1~8 ohms

Daisy chain connection allows linking of 2 Zero.3

amplifiers to work as 1 single amplifier.

Please read the following connection diagram cautiosly to ensure the correct connection.

Step 1. Connect the master 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 amplifier in daisy chain Rca jack as shown

in the diagram.

Step 3 . Set slave amplifier output master & input slave switch to slave input position.

Step 4 . Connect speaker cable (+) on master amplifier to subwoofer (+)

Step 5. Connect speaker cable (+) on slave amplifier to subwoofer (-)

Step 6 . Connect speaker cable (-) on master amplifier to speaker cable (-) on slave amplifier.

Speaker Impedance 1~8 ohms


4. Troubleshooting

The protection circuits of the amplifier prevents severe damages from faulty conditions & improper use.

The protection indicatior will switch on due to short circuit connection & speaker overload, thus the amplifier will be turned off.

Prior to inspecting the occurred problem, turn all levels down & all power off, then carefully check the installation for wiring mistakes, shorts or faulty ground (GND). If the amplifier shuts down due to excessive heat, the protection indicator will light up; please allow time for the unit to be cooled off. Before removing your amplifier, refer to the list below and follow the suggested procedures step by step. If not at ease, contact an authorized installer which can assist you.


Measure voltage on the +12V terminal.

Ensure that the remote terminal has min. 13.8V DC remote connection.

Recheck the ground (GND) connection. Inspect the in-line fuses.

Check the protection LED is not on.

Check shorts on speaker wires & the connected load / impedance. Check power cables & GND.

Disconnect the speaker cables and reset the amplifier.

High / Low voltage, operation voltages is 9v ~ 15v. Voltages beyond this will cause the amplifier to go into protect.


Measure the speaker impedance & that it is in accordance with the configuration.

Inspect the power cable for shorts along with vehicle chassis.


Measure the speaker impedance & that it is in accordance with the configuration.

Check speaker shorts.

Ensure airflow around the amplifier is sufficient & that the amplifier is not installed in areas of excessive vibration.


Ensure that the gain settings on the amplifier is matched with the output level of the head unit.

Adjust the head unit volume.

Check speaker shorts.

Adjust the crossover frequencies in accordance with the setup.

If no output at all, check the RCA connections & the cable itself.


Disconnect the signal input to the amplifier, then turn it on and off.

a) If the noise is cancelled, then connect a delay turn on module on the REM wire running from

the source unit to the amplifier.

b) Use another 12V source for REM lead to the amplifier. If the noise is cancelled, use a relay

to isolate the amplifier from the turn on thump.


Ensure that all signal transferring wires (RCA, speaker cables etc) are kept seperately / away from

the power and the ground wires.

Bypass all electrical components between the Head unit and the amplifier.

Connect the Head unit directly to the amplifier’s input. If the noise is eliminated, the unit bypassed

is the one causing the noise.

Remove the existing ground wires for all electrical components installed. Ensure that the point of

ground is 100% metal which has been grinded free of rust, paint etc.

Replace the ground cable from the OEM battery / alternator and ensure it is grounded accordingly.

Test the battery and alternator load (can be carried out by a professional).

Ensure that the vehichle’s electrical system is in a good condition, this includes distributor, alternator,

spark plugs / wires, voltage regulators etc.

Feel free to visit us at: www.b2audio.com & at facebook; www.facebook.com/b2audio



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