SOUND4 IMPACT Eco is sound processing technology at its best. No small detail is overlooked in this product which delivers innovation, multifunctionality and dependability in equal measure to produce the consistently loud and clear sound you need. It has a powerful processing chain which includes 2-band input Automatic Gain Control, based on signal strength and no longer on electrical average values. It automatically detects differences in levels to smooth out variations in sound perception. Its structure ensures perfect stability and enhanced vocals combined with a good bass presence.

The SOUND4 IMPACT Eco introduces an innovative process - mono and stereo parts of the signal are processed separately to obtain perfect consistency in terms of both sound and level. Therefore, in moving reception, when the FM receiver switches from stereo to mono and back to stereo, the sound variations and changes in level are reduced by over 90%. In the SOUND4 IMPACT Eco processing chain, the stereo expander can be used substantially without any limitations.

With the 6-band processor, a single algorithm guarantees the gain in each of the bands in order to complete sound stability. “Coloring” is controlled by the Fidelity parameter, which means that it is possible to have a “purist” and a “colored” sound texture. The 3-band limiter prepares the work of the final limiter and is provided with a very powerful algorithm, simplified to the maximum, so that it is not encumbered with useless parameters.

One of the most significant features of the SOUND4 IMPACT Eco is the 4-band parametric equalizer, which is not there to “build a sound” but rather allows some final little touch-up that may be required before the final limiting section.

What is more, this tool has reliable backup capabilities and a number of options. These include Basic and Full RDS, Streaming Extension, IP TX + RX and Dual IP TX + RX to name but a few. It can also perform Internet radio streaming and has six fully configurable encoders supporting MP3, AAC and HE-AAC v1 and v2.

SOUND4 IMPACT Eco comes in a convenient, compact 1U case at affordable price and the easy-to-use remote control interface, this is the ultimate sound processing tool.


  • 4 inputs - AES from 32 to 192 kHz, analog, IP (Livewire or SOUND4 IP CONNECT)
  • Mixing of inputs and automatic safety function.
  • 5 simultaneous and independent outputs - TX1, TX2, AES, Analog IP (Livewire or SOUND4 IP CONNECT).
  • Routing of signals for outputs.
  • Relay switch for automatic by-pass.
  • Digital AES/EBU synchronization input.
  • DSP computing power - 4 Giga Flops (Sharc 40 bits with floating point).
  • GUI and driver compatible 32 & 64 bits - Windows 7, Windows 8 & 8.1, Windows 10, Windows 11, 2008 R2, 2012 and Linux (Debian)


User-Friendly Control Interface

  • Sound setting from one single screen - you no longer need to open and close windows to go from one function to another.
  • Two modes - Easy and Full. Easy - provides simplicity and rapidity; Full - allows you to explore all of the processor functionalities. There are also ultra-rapid VU meters for true control over modulation.
  • Unlimited “Undo/Redo” versioning function for presets with possibility of recall.
  • Innovative “compare” function with reference notion.
  • Log function for presets.
  • A readable and interactive diagram.
  • A remote connection manager to control several processors.
  • Works with the following operating systems - WXP SP3, W7 32& 64 bits, W8 32 & 64 bits, WS 2008 R2, WS 2012, Linux (Debian).



HQ Sound, main sampling process frequency of 192 kHz.

  • 2-band AGC.
  • 4-band EQ + Tone FX and Stereo FX.
  • Stereo enhancer.
  • 6-band process with Fidelity and Sound Impact System (S.I.S.).
  • 3-band limiter.
  • 4-band EQ.
  • Final limiters
    • FM path - Bass Clipper + FM Limiter + MPX Limiter
    • HD path - Look Ahead limiter for the HD outlet.
  • BS412 compliant MPX power controller.
  • Ultra low delay - 30 milliseconds.


Others key points:

  • Stereo Matrixing for better stability in loudness and sound tone when the receiver switches from mono/stereo/mono.
  • 19 kHz embedded pilot to gain close to 1 dB in loudness.



  • Basic RDS encoder (with scrolling PS)
  • Full RDS (UECP-compatible)
  • IP Codec - SOUND4 IP Connect
  • Audio Backup - thanks to the audio driver
  • Audio streaming - 6 encoders (MP3, AAC, HE-AAC v1 & v2), compatible with all delivery servers (Icecast, Shoutcast v1 & V2, Flash, Wowza)
  • Replication of inputs
  • Link & Share - 100% of all parameters are accessible via the telnet protocol
  • Panels - the device allows you to create your own panels with unlimited functionality
  • Preset Sharing - the ultimate solution to managing an unlimited number of processors. All of them are automatically updated if a one of them is modified

Input State

The SOUND4 IMPACT Eco has four inputs - Digital, Analog, IP (Livewire or SOUND4 IP Connect) and PCI.

On the software interface, the input currently in use is indicated by a triangle on the left side of its name.


2-Band AGC

With the SOUND4 IMPACT Eco, the first processing function is the 2-Band AGC - automatic gain control whose main purpose is to stabilize the loudness level applied to the input of the processor and prevent noticeable level differences between recent and old titles.


Tone FX

The Tone FX makes coloring of sound before dynamic processing possible. To do so, it groups together two types of processing functions:

  • A 4-band parametric equalizer;
  • An effect system making it possible to strengthen low frequencies and high frequencies.

The two functions offer results that are entirely different, which is why they are gathered on one single screen.

In Basic mode, use of the four parametric equalizers is simplified to the maximum. Only the gain for each correction is accessible. For FX Bass and FX Treble, dosage of the effect is also made accessible.

In Advanced mode, users have access to all equalizer parameters (gain, frequency and Q factor).


Stereo FX

SOUND4 IMPACT Eco has a true stereo enlarger, 100% mono-compatible. Its role is to sublimate the existing stereo image. It will thus never create stereo in mono sources.

In addition to embellishing the stereo image, it also has a 3-band stereo image limiter acting on the control of the energy transmitted by the stereo sub-porter at 38 kHz. This unique functionality limits issues currently caused by the traditional enlargement processes. The stability of reception in areas disturbed by multiple routes is thus greatly optimized.


The 6-Band Process

The 6-band Process is the heart of dynamic processing. With SOUND4 IMPACT Eco, a single algorithm guarantees the gain in each of the bands in order to complete sound stabilization. “Coloring” is controlled by the Fidelity parameter. Thus, it is possible to have a purist and a colored sound texture.

The 3-band Process is achieved through the revolutionary algorithm S.I.S. (Sound Impact System), which makes it possible to maintain the authenticity of the original sound attacks.


The 3-Band Limiter

The main purpose of the 3-band Limiter is to prepare the work of the final limiter. It is also provided with a very powerful predictive algorithm, which has been simplified to the maximum, so that it is not encumbered with useless parameters.


The 4-Band Parametric EQ

The parametric 4-band equalizer is by far the most impressive feature of the SOUND4 IMPACT Eco. It is not there to "build a sound"; it allows some last little touchup if necessary before the final limiting section.

In Basic mode, use of the four parametric equalizers is simplified to the maximum. Only the gain for each correction is accessible. For FX Bass and FX Treble, dosage of the effect is also made accessible.

In Advanced mode, users have access to all equalizer parameters (gain, frequency and Q factor).


The Final Limiter

The Final Limiter comprises two sections - one for FM applications and one for HD applications.

The FM Section consists of a Bass Clipper, guaranteeing powerful bass without distortion, an FM limiter and an MPX limiter.

The HD Section is specifically designed for high quality digital applications (HD/DAB/DRM). This is a look-ahead type of limiter and in this mode the outputs are not limited to 15 kHz.


Assignment of Outlets

The outlets of SOUND4 IMPACT Eco are fully assignable. For example, the analog outlet may replicate the signal which is applied to the analog input, the digital outlet delivers an HD signal, the TX1 outlet delivers the MPX signal and the TX2 outlet drives the 19-kHz pilot signal.

    Quantity1 stereo
    Level2 ranges (+12 or +24 dBu - software selectable)
    Impedance10 kΩ
    Connectors1 pair on a DB62 I/O connector balanced, EMI suppressed
    Quantity1 stereo
    Sampling Rate32 to 192kHz, 24 bits
    Connectors1 on a DB62 I/O connector balanced, EMI suppressed
    Quantity/Connector1 on a DB62 I/O connector, EMI suppressed
    Sync TypeWord Clock - 32 to 192 kHz
    VideoPAL or NTSC
    Level1 to 6 Volts
    Impedance75 Ω
    Quantity/Connector1x BNC, EMI suppressed
    LevelSame as MPX output (adder)
    Impedance75 Ω or 10 kΩ, jumper selectable
    Quantity1 stereo balanced (with automatic unbalancing)
    Level2 ranges (+12 or + 24 dBu - software selectable)
    LoadImpedance 10 kΩ typ. (> 300 Ω)
    Connectors1 pair of XLR male balanced, EMI suppressed; 1 pair on a DB62 I/O connector balanced, EMI suppressed
    Quantity1 stereo
    Sampling Rate32 to 192kHz, 24 bits
    Connectors1x XLR male balanced, EMI suppressed; 1 on a DB62 I/O connector balanced, EMI suppressed
    Quantity/Connector2x independent BNC, EMI suppressed on a DB62 I/O connector
    SignalMPX or 19kHz pilot
    Level2 ranges (+6 or +18dBu - software selectable)
    LoadImpedance 75 Ω typ. (> 35 Ω)
    Processing Delay MPX30ms
    Processing Delay Analog Out (HD)11ms
    Frequency Response MPX30Hz - 15 kHz +/-0.2dB (de-emphasized)
    Frequency Response Analog Out (HD)30Hz - 20 kHz +/-0.2dB
    Signal to Noise>90 dB
    Distortion MPX<0.018% THD
    Distortion Analog<0.006% THD
    Separation>70 dB
    AoIP/AES67Ethernet 100Mbps; 2 channels; Compatible AES67, Ravenna, Livewire, Dante AES67; 48kHz, 24 bits, stereo, >= 12 samples/packet (250μs), delay 1ms
    IP CodecEthernet 100Mbps; High quality stereo codec (32 to 200kbps) or linear; 2.5s compensation buffer
    TypeSingle EMI suppressed
    Voltage100 – 260 Volt AC, < 40W
    Operational between0 – 50°C
    Dimensions (WxHxD)485 x 44 x 260mm
    Shipping Weight550 x 120 x 580mm / 3.500kg
    HS Code8517620000
    Boot time3s Analog/AES3 I/O, 8s AES67/Livewire
    AESAES in => AES out
    AnalogAnalog in => Analog out
    USB2.0, for upgrades
    micro SD cardfor music files
    Linux Debian32 & 64 bits
    Microsoft Windows32 & 64 bits: Windows 7, Windows 8, Windows 10, Windows 11, Windows Server 2008 R2, Windows Server 2012, Windows Server 2016, Windows Server 2019
    TCP/IPClient (Remote) / Server (Impact) architecture via Ethernet 1000Mbps
    Link & ShareAll parameters are accessible via simple Telnet protocol
    SNMPSupervision with Trap Feature
  • Quick User Guide

    SOUND4 IMPACT/PULSE Eco Quick User Guide (English)
    Size: 1.33 MB Download

    SOUND4 IMPACT/PULSE Eco Quick User Guide (Russian)
    Size: 1.35 MB Download

  • User Manual

    DB62 AUDIO I/O Connector User Manual (English)
    Size: 767 KB Download

    SOUND4 IMPACT Eco User Manual (English)
    Size: 8.20 MB Download

    SOUND4 IMPACT Eco User Manual (Spanish)
    Size: 16.14 MB Download

  • Software

    Universal All Products Installer

    The Universal Products Installer is the complete installation kit for all SOUND4 Products. Whatever you are using, an In-Box (19 inch racks) or a In-Card (PCIe or PCI cards), the Universal Products Installer installs the software suite for HD/FM products, IP Codecs, Voice Processors and Streaming Processors...

    The Universal Products Installer includes:
    • The Remote Control Software for In-Box and In-Card Products
    • For In-Card Products (PCI & PCIe):
      • SOUND4 cards Drivers (PCI & PCIe)
      • The SOUND4 Server (the service which handles data communication from/to cards)
      • Latest upgrade files (for all PCIe & PCI products)

    Link&Share Transmitter

    Link&Share is an open command protocol compatible with all SOUND4 Products. Thanks to Link&Share, it is possible to change a product Input, change the On Air Preset, switch an IP Link... Everything is possible with Link&Share!

    Here is the Link&Share Transmitter which offers you the possibility to send commands by script...

    Remote Support Tool
    Size: 4.25 MB Download

    You need a dedicated support, you need our assistance remotely on your equipment... No problem, the TeamViewer Remote Tool Support is at your disposal.

    When downloaded, run it directly. In the window, you will see an ID number and a password. Please send it to our support team for a dedicated remote support.

    Note: this third party tool is provided for free.

    Alarm Stacker

    The Alarm Stacker is a free program used to supervise and send alarm messages by email when something is not working correctly. According to product type, users have the possibility to define alarms on a very complete list of parameters.

    To oversee the operations of one or more SOUND4 cards, this program must be installed on the computer that hosts the cards.

    This program is compatible with all SOUND4 products.

  • Extensions

    Stream Extension

    The Streaming Extension is the Streaming engine needed for SOUND4 STREAM x2 / x4 /x8. Products. It supports encoding (MP3, AAC, HE-AAC, HE-AACv2...), metadada management and pushes to delivery servers (Flash, Darwin, Helix, Wonza, Icecast 2, Shoutcast…).

    The Streaming Extension is also available in option for HD/FM Products.

    Full RDS Extension

    The Full RDS Extension gives acess to RDS coding in advanced mode. The Full RDS encoder is running with UECP commands, and is fully remotable through RS232 or IP port.

    Kantar Media Watermarking Extension

    This extension is needed for this product if you have to use the watermarking from Kantar media.

  • Linux

    Linux Ubuntu OS

    SOUND4 proposes you to install the software package under your own Ubuntu.

    NOTE: SOUND4 does not offer Linux support. You have to master Linux Management if you plan to use these software packages.

    Compatibility with Ubuntu distributions:

    • Lucid Lynx - 10.04 LTS
    • Precise Pangolin - 12.04 LTS
    • Trusty Tahr - 14.04 LTS
    • Xenial Xerus - 16.04 LTS
    • Bionic Beaver - 18.04 LTS
    • Focal Fossa - 20.04 LTS
    • Jammy Jellyfish - 22.04 LTS

    Installation For a PC hosting SOUND4 card and running compatible Ubuntu version:

    1. Click on the following link to add SOUND4 repository - http://www.sound4.biz/repository/ubuntu/sound4-repository.deb
    2. Then install the driver with following link - apt://sound4exp1?refresh=yes
    3. Finally, install the SOUND4 server with following link - apt://sound4server

    If you also want to install:

    - the SOUND4 Remote Control, please use the following link - apt://sound4remote

    - the SOUND4 Stream, please follow the link - apt://sound4stream

    If you prefer to manage package installation by yourself, please follow the instructions below:

    1. Add the following source to your Ubuntu repository list (example for Lucid) - deb http://www.sound4.biz/repository/ubuntu lucid non-free
    2. Then get the SOUND4 GPG signature key - wget -q http://www.sound4.biz/repository/sound4.gpg -O- | sudo apt-key add -
    3. Install required packages - sudo apt-get update && sudo apt-get install sound4exp1 sound4server sound4remote sound4stream
    4. Add the user to the audio group (needed for Alarm Stacker GUI) - sudo adduser $USER audio
    5. Log off and on to make the settings effective.
  • Images


    This archive contains all images from product's gallery.

SOUND4 IMPACT Eco is offering as an option the Kantar Media Audio Watermarking Technology for audience rating. Today and depending on the countries, radio stations can be listened to on FM, DAB, Streaming, polling companies need to know the audience results for each of the media.

The SOUND4 IMPACT Eco is the most advanced watermarking processor, it can tag up to 2 different feeds:

  • 1 for the HD/FM output
  • 1 for the streaming encoder

In the SOUND4 IMPACT Eco Line, watermarking is always carried out at the end of the processing chain to guarantee maximum watermarking quality.


About Kantar Media watermarking technology

SNAP audio watermarking technology by Kantar has been designed for TV and Radio audience measurement. In addition, it can also be used for the synchronization of second screen application. SNAP watermarking carries 2 types of information, a channel identifier and a timestamp for linear content and a timecode for non-linear content.

Audio watermarking technology can be described by 3 main properties which are the inaudibility of the watermarking, the amount of data carried by the watermarking and the robustness of the watermarking.

The SNAP technology remains inaudible thanks to a very complex acoustic model and preserves the quality of the sound. This is a crucial property for TV channels and Radio stations that spend time and money to get the best quality for their sound. Regarding the amount of data, the SNAP technology proposes a single payload for Channel and Content identification. Robustness of SNAP watermarking to broadcast chain is also a key element. SNAP is robust to low encoding bitrates, and to adaptive bitrates. Don’t hesitate to contact Kantar support to get bitrate recommendations depending on the audio codec.