DBZ DMi 4 Professional Power Amplifier User Manual

: June 14, 2024
: DBZ

Table of Contents

DBZ DMi 4 Professional Power Amplifier
Product Information
Product Usage Instructions
Safety Instruction
- Installation
Operation
Foreword
- Main Features:
Front Panel Introduction
Rear Panel Introduction
Connectors Introduction
Speakon Connection Socket
Installation
Technical Specifications
Troubleshooting
Warranty
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DBZ DMi 4 Professional Power Amplifier

Product Information

Specifications

Dimensions: 102 x 3 x 3 inches
Weight: 2.56 lbs
Power: 110-240V AC, 50-60Hz

Product Usage Instructions

Step 1: Unboxing
Start by removing the product from its packaging. Make sure to keep all the accessories and user manual for future reference.

Step 2: Setup and Installation
Place the product on a stable surface and connect it to a power source using the provided power cable. Ensure that the voltage matches the specifications mentioned above. Once connected, turn on the product using the power button.

Step 3: Product Configuration
Follow the on-screen prompts or consult the user manual to configure the product settings according to your preferences. This may include language selection, Wi-Fi setup, and other personalized options.

Step 4: Product Operation
Once the product is set up, you can start using it. Refer to the user manual for specific instructions on how to operate different features and functionalities of the product.

Step 5: Maintenance and Cleaning
To ensure optimal performance and longevity of the product, it is important to regularly clean and maintain it. Use a soft, lint-free cloth to wipe the exterior surfaces and avoid using harsh chemicals or abrasive materials that may damage the product.

Frequently Asked Questions (FAQ)

Q: What is the voltage requirement for this product?
A: This product operates on a voltage range of 110-240V AC, 50-60Hz.

Q: Can I connect this product to my Wi-Fi network?
A: Yes, this product supports Wi-Fi connectivity. Please refer to the user manual for instructions on how to connect it to your network.

Q: How do I clean the product?
A: Use a soft, lint-free cloth to gently wipe the exterior surfaces of the product. Avoid using harsh chemicals or abrasive materials that may damage the product.

Professional Power Amplifier

Safety Instruction

Warning

Installation

Only connect the unit to an AC outlet of the type shown in this manual or on the adapter. Otherwise it might cause a fire or electric shock.
Do not allow water to enter the unit or get it wet. Otherwise it might cause a fire or electric shock
Do not place containers containing liquid or fine metal objects on the unit. Doing so may cause a fire or electric shock if the liquid or small metal objects fall into the unit.
Do not place heavy objects (including this unit) on the power cord. Otherwise it may damage the power cord, resulting in a fire or electric shock. In particular attention, do not place heavy objects on the power cord covered by the carpet.
Be sure to connect to a suitable electrical outlet with a protective earth connection. Improper grounding may cause electric shock.

Operation

Do not scratch, bend, twist, stretch, or heat the power cord. Otherwise it may damage the power cord, resulting in a fire or electric shock.
Do not open the unit cover. Otherwise it may cause electric shock. If it is deemed necessary to repair, service or repair the product, contact the factory.
Do not modify this unit. Otherwise it may cause a fire or electric shock.
If a lightning strike occurs, switch off the power switch of the unit as soon as possible and unplug the power cord from the power outlet.
If lightning may occur, do not touch the plug of the power cable in the plugged state, as this may cause electric shock.

Errors during operation

If the power cord is damaged (eg, cut or exposed), obtain replacement from the factory. Continued use of the device with a damaged power cord may result in a fire or electric shock.
If the unit falls from a height or the case is damaged, immediately switch off the power switch, unplug the power cord from the AC outlet, and contact the factory. Failure to observe this precaution may result in a fire or electric shock.
When any anomalies are found, such as smoke, odor, noise or there are foreign objects or liquid entering the device. Please switch off the power switch and unplug the power cord from the AC outlet. If you continue to use, it may cause a fire or electric shock.

Attention

Installation

Please avoid using the power amplifiers in the following cases
- Exposed to splashes of oil, steam, such as near kitchen stoves, humidifiers and other places.
- Unstable surfaces, such as shaking tables or bevels.
- Exposure to excessive heat, such as in a window-closed car or in direct sunlight.
- Exposure to high humidity or dust accumulation environment.
Do not place the power cable near the heater, otherwise it may melt, causing a fire or electric shock.
When unplugging the power plug from the AC socket, please grasp the plug and do not pull the cable directly. otherwise it will damage the power cord, resulting in a fire or electric shock.
Please do not touch the power plug with wet hands. otherwise it’ll cause electric shock.
The power amplifier has ventilation holes on the front and back that can prevent the internal temperature from becoming too high. Do not block these vents. Otherwise it may cause a fire.
In particular attention, please don’t
- Turn the power amplifier upside down or put it sideways.
- Place the power amplifier in a poorly ventilated place, such as a bookcase or closet (not on a special stand provided)
- Cover the power amplifier with a tablecloth or place it on the carpet and the bed.
Please reserve enough space around the unit to facilitate proper ventilation. The size of the space should be: at least 5CM from both sides, at least 10CM from the front and at least 10CM from above.
If there is no sufficient air flow, the internal temperature of the power amplifier may rise and may cause a fire.
To mount several of the power amplifier on a standard ElA stand, please refer to the installation instructions
When removing the power amplifier, firstly, unplug the AC power cord from the AC socket. And unplug all connecting cables. Otherwise it may damage the cable, resulting in a fire or electric shock.
When setting up this power amplifier, make sure that the AC power socket to be used is within reach.
If any problem occurs, please immediately turn off the power switch and unplug the power cord from the power socket. Even if the power switch is turned off, there is minimal current flow to the product.
When you don’t use the product for a long time, be sure to unplug the power cord from the AC socket.
Do not expose the power amplifier to a location where it may come in contact with corrosive gases or salt foa. Otherwise it may cause a malfunction.

Operation

When connecting the speakers to the amplifier output, use the speaker-specific cables, other cables may cause a fire.
When connecting the power amplifier, please turn off all instruments, audio equipment and speakers.
Choose the correct cables and connect them as specified.
Be sure to turn the volume control knob to minimum before turning on the power of this amplifier.
Otherwise a sudden outbreak of sound may damage your hearing
Do not use this amplifier for purposes other than driving the loudspeaker.
lf you are not going to use the unit for a long time, such as going on vacation. Unplug the power cord from the AC socket. Otherwise it may cause a fire.

Foreword

Introduction
Thank you for purchasing our power amplifier products, DMi series power amplifier has a high reliability,stability and excellent acoustic properties. All of these are designed in a compact 2U size chassis.

Main Features:

Amplifier Module
DMi series professional power amplifier adopts three circuit topologies of Class 2H and Class D+AB according to the power level. The amp module boards choose copper pin plug-in resistors, which have a good performance on the audio bandwidth.
The fully enclosed tunnel heat dissipation design is matched with the high- efficiency dense tooth radiator, which can remove more than 90% of the heat by the fan, and will not stay in the chassis for a long time to form heat accumulation. Compared with the traditional semi-closed heat sink, this design has improved heat dissipation greatly.

Toroidal Transformer
High quality toroidal transformer. High-quality iron core makes the electromagnetic loss and temperature rise are very low. Power supply noise, the third harmonic signal and interference were effectively inhibited. Very low physical noise and current noise. Using special silicon steel shield, greatly reduce the noise from the circuit affected by the electromagnetic of transformer.

Protection System
It has multiple protection features such as output short circuit protection, overload protection, DC protection,
VHF protection, output voltage automatic limiter, High Temperature Auto Power Limit, on progressive volume etc.
Well protect your system devices.

Sound Characteristic

MF: warm, mellow, full of human voice; LF: powerful, moderate experience; HF: clear and slender voice.

Applications requirements.

With the XLR input jack and Speakon output jack, so DMi series is widely applicable to a variety of installation system
The device has three operating modes: STEREO (DMi 2|: CH1 – CH2 operate independently in this mode) STEREO(DMi 4): CH1 – CH4 operate independently in this mode),.
PARALLEL (in which the device outputs a single-channel source via a dual- channel amplifier system) and BRIDGE (in this mode, the device operates as a simple high-power amplifier).
Each channel has its own SIGNAL and CLIP indicators
Whenever the protection circuit of the unit is activated, the PROTECTION indicator lights and the sound output is automatically stopped.
The variable speed fan control system ensures low noise levels.
In order to maximize the power of the power amplifier and extend the normal life, before using this power amplifier, please you must read this user manual carefully. After reading, keep this manual in a safe place.

Front Panel Introduction

Mounting Hole
Used for fixing amplifiers on cabinets, easy to transport.
Handle
Used for handling product.
Air slot
The fan draws air from the front and exits it from the back. Do not block the intake and exhaust ports.
Remarks: When the power is initially turned on, the fan will have an accelerated start-up sequence, and the fan speed will automatically adjust to the normal low speed state.
CH1 Volume Knob
Input signal attenuator, in stereo and parallel mode, they control the volume of the corresponding channel; when bridged, CH1 will control the volume of the two channels CH1 and CH2.
CH2 Volume Knob
(hansel; wal an eridated, in volume kad ls me de, hot control the volume of the corresponding
Function LED lights
CLIP Level LED light
A red indicator will light when the amplitude of the output signal of the corresponding channel (above the nominal power) has shaved off and is more than 1% distorted.
Signal Level LED light
SIG Signal and -5, -10 level LED indicators.
ON Power LED light
Indicates that the amplifier is turned on and is in the working state.
LCD Screen Introduction
Voltage Display, from 150V to 270V.
Temperature Display, from 0°C to 100°C.
Power Switch
Press the switch up to “ON “and down to “OFF”. When the switch is turned on, the amplifier is powered on.
Mounting Hole
Used for fixing amplifiers on cabinets, easy to transport.
Handle
Used for handling product.
Air slot
The fan draws air from the front and exits it from the back. Do not block the intake and exhaust ports.
Remarks: When the power is initially turned on, the fan will have an accelerated start-up sequence, and the fan speed will automatically adjust to the normal low speed state.
Volume Knob
CH1 Volume Knob
Input signal attenuator, in stereo and parallel mode, they control the volume of the corresponding channel; when bridged, CH1 will control the volume of the two channels CH1 and CH2.
CH2 Volume Knob
Input signal attenuator, in stereo and parallel mode, they control the volume of the corresponding channel; when bridged, CH2 volume knob is idle and not controlled.
CH3 Volume Knob
Input signal attenuator, in stereo and parallel mode, they control the volume of the corresponding channel; when bridged, CH3 will control the volume of the two channels, CH3 and CH4.
CH4 Volume Knob cats: wateriod He roame not let moan they control the volume of the corresponding
Function LED lights
CLIP Level LED light
A red indicator will light when the amplitude of the output signal of the corresponding channel (above the nominal power) has shaved off and is more than 1% distorted.
Signal Level LED light
SIG Signal Output Power Level LED indicator.
ON Power LED light
Indicates that the amplifier is turned on and is in the working state.
LCD Screen Introduction
Voltage Display, from 150V to 270V.
Temperature Display, from 0°C to 100°C.
Power Switch
Press the switch up to “ON “and down to “OFF”. When the switch is turned on, the amplifier is powered on.

Rear Panel Introduction

Thermal Breaker
The power amplifier will disconnect the AC power supply in the event of an overload condition.
Pressing the reset lever after the fault is released, it will restore the operation (reusable).
Power Cable
Plug into AC power socket.
Signal In LINK
LINK Input Connector(Pin 1=Ground/Pin 2=+/Pin 3=-).
Signal In
XLR Input Connector:
Balance input: Pin 1=Ground/Pin 2=+/Pin 3=- (according to standard IEC 268)
un-balance input: Pin 1/3=Ground/Pin 2=+
Speakon Output Connector
Stereo/Parallel Mode:
Speakon1 1 + / 1 – Respectively Connect the positive (+) / negative (-) terminals of speaker 1.
Speakon12 + / 2 – Respectively Connect the positive (+) / negative (-) terminals of speaker 2.
Speakon2 1 + / 1 – Respectively Connect the positive (+) / negative (-) terminals of speaker 2.
Speakon2 2 + / 2 – Idle.
Bridge Mode:
Speakon 1 1 + / 2- Respectively Connect the positive (+) / negative (-) terminals of speaker 2.
Binding Post Connector
Stereo/Parallel Mode:
Channel 1 red (+) / black (-) Binding posts are connected respectively to the positive (+) /negative (-) terminals of speaker 1.
Channel 2 red (+) / black (-) Binding posts are connected respectively to the positive (+) /negative (-) terminals of speaker 1.
Bridged Mode:
Channel 1 red (+) Binding post connected to the positive (+) terminals of speaker and
Channel 2 black(-) Binding post connected to the negative(-) terminals of spaker.
Fan Outlet
The fan draws air from the chassis.
Input Sensitivity Switch
0. 775V (OdBu) / 1V (OdBv) / 32dB Threes input gain choices.
Working Mode Switch
Stereo: CH1-2 Function Independent work and control.
Parallel: 1)Input signal to CH1, CH1 is paralleled with CH2, CH1 and CH2 are controlled independently, now CH2 input is invalid.
Bridged: 1) Input signal to CH1, signal through CH1 will access CH2 in reverse phase,The volume of CH1 can control CH2 at the same time. CH1 Output and CH2
Output connect with Speaker in series.
Earthina Switch

When the switch is turned ON (AC ground), the ground switch is on (AC-DC ground), signal ground selection — The audio system noise can be suppressed by grounding switch.

Note: The output of all amplifiers will produce high voltage. Live installation is not allowed. There shouldn’t be any excess bare copper exposed between the speaker cable and the amplifier binding posts. In addition, please do not ground the amplifier output, or access to any other amplifier input or output. Please use high-quality speaker connector and speakers dedicated cable, and minimize the power amplifier and speaker connection cable.

Thermal Breaker
The power amplifier will disconnect the AC power supply in the event of an overload condition.
Pressing the reset lever after the fault is released, it will restore the operation (reusable).
Power Cable
Plug into AC power socket.
Signal In LINK
LINK Input Connector(Pin 1=Ground/Pin 2=+/Pin 3=-).
Signal In
XLR Input Connector:
Balance input: Pin 1=Ground/Pin 2=+/Pin 3=- (according to standard IEC 268)
un-balance input: Pin 1/3=Ground/Pin 2=+
Speakon Output Connector
Stereo/Parallel Mode:
- Speakon1 1 + / 1 – Respectively Connect the positive (+) / negative (-) terminals of speaker 1.
- Speakon1 2 + /2 – Respectively Connect the positive (+) / negative (-) terminals of speaker 2.
- Speakon2 1 + / 1 – Respectively Connect the positive (+) / negative (-) terminals of speaker 2.
- Speakon2 2 + / 2 – Idle.
- Speakon3 1 + / 1 – Respectively Connect the positive (+) / negative (-) terminals of speaker 3.
- Speakon3 2 + / 2 – Respectively Connect the positive (+) / negative (-) terminals of speaker 4.
- Speakon41 + / 1 – Respectively Connect the positive (+) / negative (-) terminals of speaker 4.
- Speakon4 2 + 12 – Idle.
  Bridge Mode:
- Speakon1 1 + / 2- Respectively Connect the positive (+) / negative (-) terminals of speaker 2.
- Speakon3 1 + / 2- Respectively Connect the positive (+) / negative (-) terminals of speaker 2.
Input Sensitivity Switch
0. 775V (OdBu) /1V (OdBv) / 32dB Three input gain choices.
Working Mode Switch
Stereo: CH1-4 Function Independent work and control.
Parallel: 1)Input signal to CH1, CH1 is paralleled with CH2, CH1 and CH2 are controlled independently, now CH2 input is invalid.
2)Input signal to CH3, CH3 is paralleled with CH4, CH3 and CH4 are controlled independently, now CH4 input is invalid.
Bridged: 1) The volume d CHain con tro c2 at the slame time. in outer anda2
Output connect with Speaker in series.
Earthina Switch
When the switch is turned ON (AC ground), the ground switch is on (AC-DC ground), signal ground selection — The audio system noise can be suppressed by grounding switch.
Binding Post Connector
Stereo/Parallel Mode:
- Channel 1 red (+) / black (-) Binding posts are connected respectively to the positive (+) /negative (-) terminals of speaker 1.
- Channel 2 red (+) / black (-) Binding posts are connected respectively to the positive (+) /negative (-) terminals of speaker 1.
- Channel 3 red (+) / black (-) Binding posts are connected respectively to the positive (+) /negative (-) terminals of speaker 1.
- Channel 4 red (+) / black (-) Binding posts are connected respectively to the positive (+) /negative (-) terminals of speaker 1.
  Bridged Mode:
- Channel 1 red (+) Binding post connected to the positive (+) terminals of speaker and
- Channel 2 black(-) Binding post connected to the negative-) terminals of speaker.
- Channel 3 red (+) Binding post connected to the positive (+) terminals of speaker and
- Channel 4 black(-) Binding post connected to the negative(-) terminals of speaker.
Fan Outlet
The fan draws air from the chassis.

Connectors Introduction

Binding Post Connection
At the end of each speaker cable,peel off the 15mm-long insulation and place the bare wire through the appropriate binding post of the speaker. Tighten the posts until they grip the wire firmly. Refer to the socket for the polarity of the speaker.

XLR input connector connection dia tear ises snide, pin 2 is positive (4). pin 3 is negative (-),Balanced XLR wiring diagram

Description:
When the input signal source is unbalanced mode (single-ended) input, XLR Pin 1 and Pin 3 can be connected in parallel.
But an unbalanced signal cable should not be too long, otherwise it will lead to line noise (hum), it is recommended as far as possible to use balanced input connection mode to improve noise suppression.

Speakon Connection Socket

Switch off POWER.
Plug the Neutrik NL4FC into Speakon socket on the rear panel of amplifier, and then lock it clockwise.

Speakon Connector
At the end of each speaker cable, peel off the 15mm-long insulation and place the bare wire through the appropriate binding post of the speaker. Tighten the posts until they grip the wire firmly. Refer to the socket for the polarity of the speaker.

Connection Mode Introduction
Connect the speakers as shown below. Note that the speaker impedance varies depending on the connection method and the connected speaker parameters. Be sure that the speaker impedance is not lower than the lowest value shown below.

Bridge Mode
The output speaker cable must be connected to the positive pole of channel 1 and the negative pole of channel 2.
The bridge output is doubling the output voltage.

If the amplifier is set to BRIDGE mode: only the CH1 volume knob is active. (The CH2 volume knob is disabled)

Stereo/Parallel Mode

INPUT (CH1, CH2)
Each channel is equipped with two sockets. Note that when using BRIDGE or PARALLEL mode,only the channel 1 is valid.

Bridge Mode
The output speaker cable must be connected to the positive pole of channel 1 and the negative pole of channel 2.
The bridge output is doubling the output voltage.

If the amplifier is set to BRIDGE mode: only the CHand CH3 volume knob is active. (The CH2/ CH4 volume knob is out of use)

Stereo/Parallel Mode

INPUT
Each channel is equipped with two sockets. CH1 and CH3 both have a parallel/LINK output socket.

Installation

Stack installation
In order to ensure good cooling environment,please amount power amplifiers according to below conditions

Due to lots of dust in construction environment, there might be much dust in filter sponge blocking wind path. It’s advised to clean sponge with high-power vacuum cleaner.
Monthly maintenance can guarantee good heat radiation. Besides, please do not pile cables before air outlet.
Kindly tie them up and put them on amps two sides.

Avoid air short circuit.
Prevent hot air from drawing to front panel exhaust inlet.

Working temperature is suggested below 35°C.
When stacking not horizontally, it’s advised to make rear panel air outlet upside or make rear panel opposite to air outlet.
Even when system programming and other limit conditions, the working temperature is also suggested below 35 C.

Technical Specifications

Remark:

“*” Measure by pulse signal.
The amplifier’s PSU operates as a non-resistive load, so the calculation “Volts x Amps = Watts” would not be correct.
All specifications are subject to change without notice.

Troubleshooting

Warranty

Warranty range

We provide 1 year warranty, during this period, as a result of product materials and manufacturing process problems and failures. When verification is true, the company offers free repair and replacement devices.
The following cases are not in the free maintenance range:
- The product is faulty or damaged due to improper installation or improper use.
- The product has ever been repaired, altered, or modified by any other company’s technical staff, or the user replaces any part of the machine by himself.
- The serial number is altered or tore up the warranty label.
- Negligent use. water, or other objects are getting into the machine and cause damage.
- Failure or damage caused by a natural disaster.

Any cost will be covered by the users with the following circumstances

As a result of natural or man-made or other irresistible matter, the product is damaged or in a failure.
Damage to the product as a result of improper use or modification.
Damage to the product after installation or destruction.

We do not accept any responsibility for any damaged speakers or other equipments caused by improper use of this product.

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DBZ DMi 4 Professional Power Amplifier

Product Information

Product Usage Instructions

Safety Instruction

Installation

Operation

Foreword

Main Features:

Front Panel Introduction

Rear Panel Introduction

Connectors Introduction

Speakon Connection Socket

Installation

Technical Specifications

Troubleshooting

Warranty

Read User Manual Online (PDF format)

Download This Manual (PDF format)

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