SounDigital 400.2 EVO4.0 Owners Manual

Introduction

Dear Customer, Congratulations on acquiring your Soundigital! You've just purchased a product of high quality and technology. The Soundigital products are developed to assure maximum efficiency and reliability to your sound system.

Class D Amplifiers

The main characteristics of Class D amplifiers are audio quality, efficiency, versatility and compact design. Here are the advantages of these characteristics:

Audio Quality

Class D amplifiers used to have a limited response in the past and they used to have a worse performance regarding higher frequencies than Class AB amps, despite being more efficient. Introducing new technologies, Soundigital developed a Class D amplifier superior to the Class AB ones in efficiency and performance.

Efficiency

The Soundigital Class D amplifiers have a total efficiency (power source + output) higher than 70%, assuring a battery consumption and a heating lower than the expected.

Versatility of Uses

The flat response of all the frequencies of Soundigital amplifiers allows them to be used in all the kinds of systems: SPL, Sound Quality, Trio Eletrico and Pancadao, meeting the needs with extreme quality.

Compact Design

The high efficiency and technology allow our amplifiers to be really compact, making it easy to install them in vehicles where you have limited space.

Important Info

Read this manual and follow its instructions and information carefully. It contains extremely important information to have your amplifier working properly. If you feel the need to contact our Tech Support, you can reach our technicians through the e-mail sac@soundigita.com.

Package Contents

• 1 EVO4.0 Amplifier
• 1 Installation quick guide with warranty card
• 1 Promotional sticker

Safety Instructions

To prevent injuries to the user or damage to the amplifier, read all safety instructions written on this manual.

• If you are insecure about the installation of this equipment, get in touch with our tech support or with a professional specialized in car audio installation.
• Before proceeding with the installation of any electric equipment on your vehicle, unplug the negative (-) terminal of the battery to avoid fires, injuries or damages.
• Use your sound system safely. The continuous exposure to sound pressures over 85dB may cause irreversible hearing damage.
• This equipment is for use in automotive DC voltage batteries between 12.6 and 14.4 volts. Before installing the equipment, check voltage of the batteries.
• Do not install the amplifier in places exposed to water, dirt or humidity.
• Choose a ventilated place to install the amplifier and avoid blocking the side ventilation windows.
• Mount the amplifier in a secure way. Avoid mounting it on metallic parts of the vehicle, because it may cause ground looping (noise).
• Make sure that the location chosen for the amplifier installation does not affect the operation of the vehicle.
• When passing cables through metallic walls, use rubber O-rings to avoid cable cutting and short-circuits.
• Clean the amplifier periodically with brush or dry cloth to assure the thermal efficiency of the heatsink.
• This product may reach temperatures over 60°C/140°F. Make sure it is cold before touching it.
• Be careful when making holes in the vehicle. Make sure you are not making holes in the fuel tank, brake lines or electrical cables of the vehicle.
• Make sure the cables are properly secured throughout the installation.
• Wear gloves, safety glasses and all necessary PPE during the installation of SounDigital amplifiers.

⚠ Warning! This "WARNING" sign alerts the user of important info. Not following these instructions may cause injuries to the user or damage to the equipment.

Assembling and Disassembling the Plastic Cover

The plastic covers have the function of finishing and hiding the amplifier fixing screws. To disassemble and assemble them, follow the instructions below.

Disassembling of the Plastic Cover

1. Carefully pull out the top of plastic cover to release the upside latches, as shown in the picture 1.

2. Slide up the plastic cover in a continuous movement to remove it.

Assembling the Plastic Cover

1. To fit the plastic cover back, carefully insert point A of the plastic cover into point B of the amplifier, slowly sliding it down.

2. Gently press the sides of the top of the plastic cover towards the bottom of the amplifier until you hear a clicking noise.

Panels Description

Front Panel

The front panel features the following controls and connectors:

• 1. Crossover Switch: Allows selection between Low Pass, Full Range, and High Pass.
• 2. Variable Gain Control: Adjusts the input signal gain.
• 3. High Level Audio Input (CH1/CH2): For connecting speaker outputs from the head unit.
• 4. Audio Input (CH1): RCA connector for line-level audio input.
• 5. Power ON LED Indicator: Indicates when the amplifier is powered on.
• 6. Input (CH2): RCA connector for line-level audio input.

Rear Panel

The rear panel contains the power and speaker connection terminals:

• 7. Negative Power Supply Connector (GND): For connecting the negative battery terminal.
• 8. Remote Power Supply Connector (REM): For the remote turn-on signal.
• 9. Positive Power Supply Connector (+12VDC): For connecting the positive battery terminal.
• 10. Negative Speaker Connector (CH2): For connecting the negative terminal of speaker 2.
• 11. Positive Speaker Connector (CH2): For connecting the positive terminal of speaker 2.
• 12. Negative Speaker Connector (CH1): For connecting the negative terminal of speaker 1.
• 13. Positive Speaker Connector (CH1): For connecting the positive terminal of speaker 1.

Electrical Sizing and Audio Inputs

Electrical Sizing

For correct operation, it is necessary to properly size the electrical system and cables. The table below indicates the minimum proper section for grounding, positive +12VDC, and audio output cables according to amplifier power.

For connections from the battery to the amplifier and ground, use good quality copper cables. CCA cables should not be used.

Audio Inputs

RCA Entry

All RCA inputs must be connected for the 2 channels to work, including the Bridge Connection.

High Signal Inputs

All High Signal Inputs must be connected for the 2 channels to work, including the Bridge Connection.

High input must be used when the main unit does not have RCA outputs. When high inputs are used, no remote connection is required; the amplifier recognizes the audio signal and switches on. If your source unit is not able to turn on the amplifier through the high level input, the remote input should be connected normally.

⚠ Warning! RCA AND HIGH INPUTS SHOULD NOT BE USED SIMULTANEOUSLY OR YOU MAY DAMAGE THE AMPLIFIER.

Installation Sequence

⚠ Warning! BEFORE PROCEEDING WITH THE INSTALLATION, UNPLUG THE NEGATIVE TERMINAL FROM ALL OF THE BATTERIES, TO AVOID FIRE, DAMAGE TO THE AMPLIFIER AND THE USER HIMSELF.

• Mount the amplifier in such a way you have access to the connectors.
• Install the power cables in the vehicle properly, starting from the battery to the fuse holder or circuit breaker, using the cable with the appropriate size. Make all connections, install fuse holders or circuit breakers, but without placing the fuses or with the circuit breakers in the "Off" position.
• ⚠ Warning! THE MAX. DISTANCE FOR THE INSTALLATION OF THE FUSE/CIRCUIT BREAKER IS ONE FOOT (30 CM) AWAY FROM THE BATTERY.
• Connect the power cables to the amplifier, observing the polarity. Connect all the positive cables from the fuse holder or circuit breaker to the positive connector of the amplifier and all the negative power cables from the batteries to the negative connector of the amplifier.
• The ground cable must be as short as possible and must be connected to the vehicle chassis and the battery negative. (Ensure paint is removed between the terminal and chassis for a good connection).
• Install the signal input cables in a proper way, distant from the power cables.
• Connect the RCA or the high signal input cables to the head unit and amplifiers.
• Install the audio output cables with the appropriate section, distant from the power and audio input cables.
• Connect the audio output cables to the amplifier and speakers respecting the positive (+) and negative (-) polarities.
• Install the remote cable with the power cables, using 1.5mm² (15 AWG) cable or thicker.
• Connect the remote power cable to the amplifier's "REM" terminal at the main unit's remote power output (when not using the high level signal inputs).
• Before powering the system, verify all the connections and make sure there are no mistakes or short-circuits on the power and ground cables.
• Reconnect the ground of the batteries.
• Check if the headunit is turned off and then place the fuses in the fuse holders or switch the circuit breakers on.
• Turn on the main unit and the amplifier will turn on the "On" LED indicating that it is in operation.

Wiring Diagram

The wiring diagram illustrates the connections for the SounDigital 400.2 EVO4.0 amplifier. It shows the connections from the head unit (via RCA or high-level inputs), the amplifier's power terminals (GND, REM, +12VDC), speaker outputs (CH1, CH2), and the connection to the vehicle's battery and ground.

Key connections shown:

• Head unit to amplifier inputs (RCA or High Level).
• Remote turn-on signal from head unit to amplifier's REM terminal.
• Power connection: Amplifier +12VDC to battery positive, Amplifier GND to battery negative/chassis ground.
• Speaker connections: Amplifier CH1/CH2 outputs to respective speakers, observing polarity.
• Bridge connection possibility is indicated.

Gain Setting

Procedure

This procedure is the same for both gain controls. Follow these steps to set the gain correctly:

• Necessary Equipment: Digital AC voltmeter, media with a 60Hz sine wave test tone recorded at 0dB, 1/8" screwdriver.
• Turn the gain control all the way down.
• Disconnect the output cables from the amplifier outputs.
• Turn off all processing (bass, treble, loudness, EQ, etc.) on the source unit.
• Set the source unit volume to 3/4 of full volume.
• Set the source unit's fader control to the center position.
• Set the crossover selector switch to "F" (Full Range).
• Use a 60 Hz sine wave test tone.
• Connect the AC voltmeter to the speaker output connectors of the amplifier, ensuring correct polarity (+ and -).
• Increase the gain control until the target voltage is observed on the voltmeter (refer to the chart below).
• Once the amplifier is adjusted to its correct voltage output, turn off the source unit and reconnect the speaker(s).

Download test tracks for setup at: https://soundigital.com/en/downloads/

Technical Data for Gain Setting

Crossover Set Up

The X-OVER switch allows selection of the crossover function:

• "F" (Full Range): All frequencies are reproduced.
• "LP" (Low Pass): Frequencies below 80Hz will be reproduced.
• "HP" (High Pass): Frequencies above 80Hz will be reproduced.

Switch Key to "F" position (Full Range): All the frequencies are reproduced.

Switch Key to "HP" position (High Pass): Frequencies above 80Hz will be reproduced.

Switch Key to "LP" position (Low Pass): Frequencies below 80Hz will be reproduced.

Technical Specs

Parameters

* Power at 12.6V @ 60Hz with maximum THD of 1%.

** It is mandatory to install the fuse at a maximum distance of 30cm from the battery.

Dimensional Data

Dimensions are provided in inches and millimeters:

• Length: 4.7" (121mm)
• Width: 4.2" (107mm)
• Height: 4.4" (113mm)
• Mounting Hole Spacing (Length): 4" (101mm)
• Depth: 2.0" (51mm)

Net Weight: 1.05 lb (0.48 kg)

Gross Weight: 1.15 lb (0.52 kg)