Deaf Bonce MLA-4080 Four Channel Amplifiers Owner’s Manual

: June 4, 2024
: Deaf Bonce

Deaf Bonce MLA-4080 Four Channel Amplifiers

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-product

INTRODUCTION

Thank you for purchasing of this Deaf Bonce product! Our company is committed to the creation of extremely loud sound systems with no loss of quality. To ensure proper use, please carefully read through this manual before using this product. It is especially important that you read and observe caution’s in this manual. Please keep the manual in a safe and accessible place for future reference.

SAFETY INSTRUCTIONS

Make sure that your vehicle has a 12V DC electrical system with negative grounding. Before installing the amplifier in cars, trucks or buses, check the battery voltage.
Check the state of onboard power supply of your vehicle, the battery and the alternator. When the engine is running, depending on the ambient temperature, the voltage to be outputted by the alternator must be within the range of 14 to 14.I V. Open circuit voltage (OCV) ofthe battery must be within the range of 12.5 to 13 V. Make sure that the rated current ofthe alternator and the battery capacity is enough to provide increased consumption.
For example, for the power of the amplifier 1000 W, the rated current of the alternator is required at the rate of 1000 W/13 V= 77 amperes. A more powerful amplifier requires a more powerful alternator as well as an additional battery.
Do not place the amplifier in the engine compartment and also in the places exposed to water, moisture, dust or dirt
Never stretch the cables outside of the car and near the moving parts of the car. I hIis can lead to the destruction of the insulating layer, short circuits,s and fire.
The amplifier should be installed in areas of the car where the temperature varies from 0°C (32 °F) to 55 °C (131F). The amplifier should be in a place with a good air circulation. The horizontal position of the amplifier is the best way to install it.
During the operation the amplifier may be heated up to 80°C (176°F). Before you touch it, make sure it is not overheated which may be dangerous.
To improve the cooling of the amplifier, it is recommended to clean periodically the heatsink from dust. When dealing the heatsink strong solvents should not be used as they may damage the amplifier. Do not use compressed air, because SOlids can penetrate inside the amplifier. Cleanings are best done with wet towels or cloth.
Make sure that the location of the amplifier does not violate the proper operation of the mechanical and electrical devices of the vehicle.
Make sure that during the installation and connection of the battery, the power cables are not shorted.
When performing plumbing, drilling or cutting works with the car, make sure that there is no wiring, brake lines, fuel pipe or other structural elements under the place of work. Follow the safety rules! Use protective glasses and gloves.
To protect the wires use rubber gaskets if the wire passes through a hole in the plate, or other similar materials if it lies close to the parts exposed to heat
Make sure that all the cables are fixed over the entire length. Also make sure that their outer protective shell is non-combustible. Use a clamping screw to secure the positive and negative cables next to the appropriate terminals of the amplifier.
Select the diameter of the power cable in accordance with the power of the amplifier and the recommendations provided here. Power cables are extremely important since they directly affect the system damping factor and sound quality. The cables to the battery must be in the copper crimp terminals pressed with the help ofa hydraulic press, and well fixed to the battery terminals.
lo avoId accidental damage, keep the amplifier in its original packaging prior tO installation.
Use high-quality copper speakers and power cables.

TYPICAL INSTALLATION SEQUENCE

Before installing the ampliﬁer disconnect the battery from the electrical system.
To connect the ampliﬁer it is necessary to stretch the power cable from the location of the battery to the place of installation of the ampliﬁer. Select the power cable with the appropriate regulations in AWG (see Table: Selection of the diameter of the pow
Ccables)onnect the power supply with the correct polarity. Connect all (+) terminals of the ampliﬁer to the cables stretching from the positive terminal of the battery and all (-) terminals of the ampliﬁer – to the cables stretching from the negative terminal of the bat r
Py.lace the fuse holder for each positive cable within 40 cm from the positive terminal of the battery and connect one end of the o nstall the fuse(s).
Rwer oute cable all to signal the cables holder next after to each connecting other the and other separately end to from the ampliﬁer. power Do cables.not i
Connect the wires of RCA input. The input signal power must be between 0.2 V and 6 V.
To connect the power wire supply is necessary to use special power cables.
Fasten the ampliﬁer properly when installing it in the vehicle. If the component is disconnected during driving, it may cause serious damage to the passengers of the vehicle or another vehicle. It is not recommended to screw the ampliﬁer directly to me l
After can lead installation to is distortions complete, at the check signal the outputs.wiring of the system and make sure that all connections have been made correctly. Before installing the fuses, disconnect the positive lead from the battery and then install the fuse in the fuse holder. Using the light bulb 12 V 21 W, connect the positive lead to one contact of the bulb and the other contact of the bulb to the positive terminal of the battery. When properly connected, the bulb must brieﬂy light up and go out. Now you may connect the positive lead to the (+) of the battery. If the light does not go out, then something is wrong. This will prevent damage to the ampliﬁer in case of reverse polarity and
To want activate sparks the when ampliﬁer, it connecting. is necessary nstall to the apply rest of the positive fuses. the potential of 12 volts to the control input of the ampliﬁer (REM IN) thr
LEough D an indicator switch or on a front of corresponding the ampliﬁer control turns output blue( to MOTindicate E OUTthat ) with the ampliﬁer head is unit (Returned U).on. If the indicator does not light up see

SELECTION OF THE DIAMETER OF POWER CABLES AND SPEAKER CABLES

Selection of the diameter of the power cables

Use the table below to select the desired diameter based on the length and the current consumption.

Use the table below to select the desired diameter based on the length and the power consumption.

WIRING DIAGRAMS

Connect the speaker cables from the positive and negative terminals of the speakers to the respective outputs of the ampliﬁer terminal marked with CH1 / CH2, CH3 / CH4 SPEAKERS OUTPUTS, as shown at the diagram. To connect the power wire supply it is necessary to use special power cables. The fuse is placed in the holder and ﬁxed in the cable cut. One end of the cable is connected to the positive terminal of the battery, the second one – to the ampliﬁer terminals marked with +12V. Be sure to use a fuse with the parameters suﬃcient for use in the system. The length and diameter of the grounding cable must conform to the length and diameter of the cable +12V. Connect one end to the negative terminal of the battery and the other end of the grounding cable to the terminals marked with GND. Connect the head unit (HU) to low-level inputs of the ampliﬁer using RCA cable.

Standard wiring diagram of the four-channel amplifier to two speakers, to one subwoofer and to battery

Step 1. Connect the speaker cable from (+) terminal of the ampliﬁer to (+) terminal of the speaker.
Step 2. Connect the speaker cable from the (-) terminal of the ampliﬁer to the (-) terminal of the speaker.
Step 3. Repeat the installation sequence for each speaker steps 1 and step 2
Step 4. Connect the speaker cable from (+) terminal of the ampliﬁer to (+) terminal of the subwoofer.
Step 5. Connect the speaker cable from the (-) terminal of the ampliﬁer to the (-) terminal of the subwoofer.
Step 6. Connect one end of the power cable from (+) terminal of the battery and the second end to the ampliﬁer terminal marked with + 12V. Do not forget to protect the positive power cable with an appropriate fuse.
Step 7. Connect one end of the power cable from the (-) terminal of the battery and the second end of the grounding cable to the terminals marked with GND.
Step 8. Connect one end of the cable to the Remote output terminal at the HU and the second end to the ampliﬁer terminal marked with REM IN.

Caution
The minimum permissible connection load impedance at a single channel is 2 ohm. For ampliﬁers MLA-4080, and MLA-4120 the operating voltage is 10-15 V.

Standard wiring diagram of the four-channel amplifier to four speakers

Step 1. Connect the speaker cable from (+) terminal of the amplifier to (+) terminal of the speaker.
Step 2. Connect the speaker cable from the (-) terminal of the amplifier to the (-) terminal of the speaker.
Step 3. Repeat the installation sequence for each speaker step 1 and step 2

Standard wiring diagram of the four-channel amplifier to head unit

Step 1. Connect one end of the RCA cable to the RCA output terminals at the HU and the second end to the amplifier RCA inputs terminals marked with CH1/CH2, CH3/CH4. Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-
fig-5

Application of connectors and controls

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-fig-6

CROSSOVER – HPF – high pass ﬁlter (10 Hz – 12 kHz at 12 dB/Oct)
CROSSOVER – selection of built-in ﬁlters operating mode (HPF, LPF / BP, FLAT)
CROSSOVER – LPF – low pass ﬁlter (10 Hz – 12 kHz at 12 dB/Oct)
BASS BOOST – bass level adjustment (0/6/12 dB)
GAIN – input signal level adjustment 0.2 V – 6 V
CH1/CH2, CH3/CH4 – signal input, RCA jacks
POWER – LED for operation (blue). PROTECT – LED for operation (red)
HI-LEVEL INPUT – high-level signal input (for model MLA-4080)

Remote control

GND – grounding supply terminal
REM IN – connector of remote activation of the ampliﬁer
+12V – power supply terminal +12 V
FUSE – fuse connection terminal
SPEAKERS OUTPUTS – speaker terminal connections
POWER – LED for operation (blue)
GAIN – input signal level adjustment

CONNECTION METHODS

The minimum permissible load impedance at the output of the ampliﬁer is 2 ohm.

SPEAKERS WIRING DIAGRAMS

In any case do not expose the amplifier to loads lower than specified by the manufacturer. Use these schematics to calculate load impedance of different connection types.

Serial connection of the speakers

Voice coil	Total impedance
4 Ohm	8 Ohm
8 Ohm	16 Ohm

Voice coil	Total impedance
4 Ohm	12 Ohm
8 Ohm	24 Ohm

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-fig-11

Voice coil	Total impedance
4 Ohm	16 Ohm
8 Ohm	32 Ohm

Parallel connection of the speakers

Voice coil	Total impedance
4 Ohm	2 Ohm
8 Ohm	4 Ohm

Voice coil	Total impedance
4 Ohm	1.33 Ohm
8 Ohm	2.66 Ohm

Voice coil	Total impedance
4 Ohm	1 Ohm
8 Ohm	2 Ohm

Mixed connection of the speakers

Voice coil

4 Ohm

| Total impedance

4 Ohm

---|---
8 Ohm| 8 Ohm

CAUTION
High sound pressure can damage your health! Please use common sense when controlling volume!

SUBWOOFERS WIRING DIAGRAMS

The minimum permissible load impedance at the single channel is 2 ohm, in bridged mode 4 ohm. Use these formulas to calculate the load impedance of various types of connections.

Serial connection

Total impedance = ΩSub 1 + ΩSub 2 + ΩSub 3.

Parallel connection

SCHEMES OF ENABLING THE LOAD OF THE SUBWOOFER

In any case do not expose the amplifier to loads lower than specified by the manufacturer. Use these schematics to calculate load impedance of different connection types.

Voice coils 1+1, 2+2, 4+4 Ohm
The subwoofer has voice coil D1, D2 or D4.

One subwoofer, coils in series

Voice coils

1+1 Ohm

| Total impedance

2 Ohm

---|---
2+2 Ohm| 4 Ohm
4+4 Ohm| 8 Ohm

One subwoofer, coils in parallel

Voice coils

1+1 Ohm

| Total impedance

0.5 Ohm

---|---
2+2 Ohm| 1 Ohm
4+4 Ohm| 2 Ohm

Subwoofers in series, coils in parallel

Voice coils

1+1 Ohm

| Total impedance

1 Ohm

---|---
2+2 Ohm| 2 Ohm
4+4 Ohm| 4 Ohm

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-fig-21

Voice coils	Total impedance
1+1 Ohm	1.5 Ohm
2+2 Ohm	3 Ohm
4+4 Ohm	6 Ohm

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-fig-22

Voice coils	Total impedance
1+1 Ohm	2 Ohm
2+2 Ohm	4 Ohm
4+4 Ohm	8 Ohm

Subwoofers in series, coils in series

Voice coils	Total impedance
1+1 Ohm	4 Ohm
2+2 Ohm	8 Ohm
4+4 Ohm	16 Ohm

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-fig-24

Voice coils	Total impedance
1+1 Ohm	6 Ohm
2+2 Ohm	12 Ohm
4+4 Ohm	24 Ohm

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-fig-25

Voice coils	Total impedance
1+1 Ohm	8 Ohm
2+2 Ohm	16 Ohm
4+4 Ohm	32 Ohm

Subwoofers in parallel, coils in series

Voice coils

1+1 Ohm

| Total impedance

1 Ohm

---|---
2+2 Ohm| 2 Ohm
4+4 Ohm| 4 Ohm

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-fig-27

Voice coils	Total impedance
1+1 Ohm	0.66 Ohm
2+2 Ohm	1.33 Ohm
4+4 Ohm	2.66 Ohm

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-fig-28

Voice coils	Total impedance
1+1 Ohm	0.5 Ohm
2+2 Ohm	1 Ohm
4+4 Ohm	2 Ohm

Subwoofers in parallel, coils in parallel

Voice coils

1+1 Ohm

| Total impedance

0.25 Ohm

---|---
2+2 Ohm| 0.5 Ohm
4+4 Ohm| 1 Ohm

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-fig-30

Voice coils

1+1 Ohm

| Total impedance

0.16 Ohm

---|---
2+2 Ohm| 0.33 Ohm
4+4 Ohm| 0.66 Ohm

Deaf-Bonce-MLA-4080-Four-Channel-Amplifiers-fig-31

Voice coils

1+1 Ohm

| Total impedance

0.125 Ohm

---|---
2+2 Ohm| 0.25 Ohm
4+4 Ohm| 0.5 Ohm

CAUTION
High sound pressure can damage your health! Please use common sense when controlling volume.

SPECIFICATIONS

7 . SPECIFICATIONS		EN
Model	MLA- 4080	MLA- 4120
*Power RMS 4 Ohm (W)**	80 x 4	120 x 4
*Power RMS 2 Ohm (W)**	120 x 4	150 x 4
*Power RMS 4 Ohm bridged mode (W)**	240 x 2	300 x 2
High pass ﬁlter (Hz)	10 -12 000	10 -12 000
Low pass ﬁlter (Hz)	10 -12 000	10 -12 000
Crossover (dB / Oct)	12	12
Bass level adjustment (dB at 45 Hz)	0 / 6 / 12	0 / 6 / 12
Frequency response (Hz)	10 – 20 000	10 – 20 000
Input sensitivity (V)	0.2 – 6	0.2 – 6
Signal-to-noise ratio (dB)	90	91
Integrated Fuse (Yes/No)	Yes	Yes
Input terminal connection (AWG / mm²)	4 / 21.2	4 / 21.2
Output terminal connection (AWG / mm²)	8 / 8.37	8 / 8.37
Working voltage (V)	10 – 15	10 – 15
Simultaneous operation of LPF and HPF	Yes	Yes
Minimum permissible load impedance on the single channel (Ohm)	2

2
Minimum permissible load impedance in bridged mode (Ohm)| 4| 4
Size (LхWхH mm)| 338 x 216 х 50| 435 x 216 х 50
Size (LхWхH inch)| 13.3 x 8.5 х 1.97| 17.13 x 8.5 х 1.97
*RMS Power at 14.4 V, THD 1%| |

POSSIBLE FAULTS AND THEIR SOLUTIONS

Deaf Bonce ampliﬁers are high-quality and technically perfect products. The problems often arise due to improper use, faulty connection of components or lack of power supply of the on-board network.

The ampliﬁer does not turn on.
Problem solution: Check all the contacts and the presence of 9-15 V at the ampliﬁer terminals. Check whether the control input of the ampliﬁer “REM IN” receives the positive potential of +12 V.
Power turns on, but goes into protection (protection indicator lights up)
Problem solution: Check if there is a short circuit (fault) on the ampliﬁer output which is connected to the speakers or subwoofers. Make sure that the commutation of the voice coils of the subwoofer is correct. The rated impedance of the voice coils should not be lower than the permissible rated load impedance of the ampliﬁer. Check the supply voltage of the ampliﬁer. It must be within the range of 9-15 V.
pliﬁer may lack power. Make sure that the ampliﬁer rated current turns on of the but at an alternator high and volume the it goes battery in to capacity protection. is enough Problem to power solution: this The ampliﬁer.am Check the ampliﬁer for overheating. Check the load impedance.
The ampliﬁer is turned on, but there is no sound from the speakers or subwoofer.
Problem solution: Check the connection of the ampliﬁer, the integrity of the interconnecting cable, HU, the speakers or the subwoofer.

BOX CONTENTS

Ampliﬁer – 1 pc.
Owner’s manual – 1 pc.
Warranty card – 1 pc.
Mounting Kit – 1 pc.
Window decals – 2 pcs.

WARRANTY AND MAINTENANCE INFO

Deaf Bonce products are warranted against defects concerning materials and their manufacturing under normal functioning conditions. While the product is under warranty, defective parts will be repaired or replaced at the manufacturer’s discretion. The defective product, along with notiﬁcation about it, must be returned to the dealer from which it was purchased together with the warranty certiﬁcate duly ﬁlled in, complete with the original packaging. If the product is no longer under warranty, it will be repaired at the current costs. Our company does not undertake any liability for damages due to transportation. Our company does not take any responsibility for: costs or loss of proﬁt due to the impossibility to use the product, other accidental or consequential costs, expenses or damages suﬀered by the customer. Warranty according to laws in force. For more information visit our website and carefully read the warranty card. The manufacturer reserves the right to change design and speciﬁcation without prior notice.

INFORMATION ON DISPOSAL OF THE ELECTRICAL AND ELECTRONIC EQUIPMENT (FOR THE EUROPEAN COUNTRIES WITH SEPARATE WASTE COLLECTION)

Items marked “crisscrossed wheeled bin” are not allowed to be disposed of together with usual household waste. These electrical and electronic products should be disposed of in special reception centers, equipped for recycling such products and components. For information about the location of the nearest disposal/recycling spot and the rules of delivery of waste please contact your local municipal oﬃce. Recycling and proper disposal help to protect the environment and prevent harmful eﬀects on health.