SOUND4 STREAM X8 is the cream of the crop in the range of tools dedicated to Webradio Processing and Encoding. It can process eight radio streams on a single PCI express card and has a streaming engine providing 6 streams per channel, for an unprecedented total of 48 streams. Each of them uses the latest generation of codecs - AAC, HE-AAC, HE-AAC v.2 and MP3. This tool comes with 8 inputs and 8 outputs through Audio Driver (WDM/Direct Sound) and/or AES67/Livewire and is compatible with all Axia and RAVENNA products. It can be used as a resource that can be routed and placed anywhere in a Livewire chain, without the need to break it.

Developed to offer clients only the best, the SOUND4 STREAM X8 includes a true sound processing chain dedicated to webstreaming and also features the “Predictive HQSound” algorithm which optimizes codec results and reduces compression-induced sound artifacts. In terms of encoding, the SOUND4 STREAM X8 offers a complete and innovative solution. With its high-quality encoding engine, it suits every audio device profile. It also includes a sound optimizer for very low encoding rates (16 kbps, 24 kbps, 32kbps) and incorporates adaptive processing which can correct each stream independently in order to compensate for the sound difference due to encoding. Thus, a radio station can easily generate different streams that suit the targeted audience - low-rate for mobile phones or high-rate for home devices. The SOUND4 STREAM X8 is compatible with most of the standards used for streaming delivery systems - Flash, Darwin, Helix, Wowza, Icecast 2, Shoutcast v.1 & v.2, etc. Being able to operate with many types of automation software, it also offers advanced metadata management.

The 3-band processing uses a single S.I.S. (Sound Impact System) algorithm, which guarantees the gain in each of the bands to ensure complete sound stability. The Wide Band Automatic Gain Control reduces gaps in the level applied to the processor, whereas the Tone FX feature makes it possible to "color" the sound before the dynamic processing. It combines a 4-band parametric Equalizer and an effect system that strengthens high and low frequencies. The Stereo FX Enhancer is 100% mono-compatible, the 4-Band Limiter prepares the work of the final limiter, and the Brick Wall Limiter provides strong gain limitation.

Advanced metadata management and the user-friendly remote control interface are also important assets of this product.


SOUND4 STREAM x8 - The First Solution of its Kind

SOUND4 is delighted to bring to the attention of our customers a solution the likes of which have so far never been introduced to the broadcasting market. The SOUND4 STREAM x8 is the very first multi-channel processor dedicated to WebRadio bouquets. It has the capability of simultaneously and independently processing a total of eight radio streams on a single PCI express card.

The SOUND4 STREAM x8 offers 8 inputs and 8 outputs through Audio Driver (WDM/Direct Sound) and/or AES67/Livewire. The streaming engine can provide 6 streams per channel for an unparalleled total of 48 streams. Each stream is set on the latest codecs generation (AAC, HE-AAC, HEAACv2 , as well as MP3).


A True Processing Chain

Created to offer clients only the best, the SOUND4 STREAM x8 includes a true sound processing chain dedicated to webstreaming:

  • AGC
  • Tone FX
  • Stereo FX
  • 3-Band Process
  • 4-Band Limiter
  • Brickwall Limiter

The SOUND4 STREAM x8 also features the “Predictive HQSound” algorithm which optimizes codec results and reduces compression-induced sound artifacts.


Advanced Coding Solutions

In terms of encoding, the SOUND4 STREAM x8 offers a complete and innovative solution.

The SOUND4 STREAM x8 has a high quality encoding engine that suits every IP audio device profile. Indeed, it is the first processor that includes a sound optimizer for very low encoding rates (16 kbps, 24 kbps, 32kbps).

Another clever bit of SOUND4 STREAM x8 innovation is the adaptive processing which can correct each stream independently in order to compensate for the sound difference due to encoding. Thus, a radio station can easily generate different streams that suit the targeted audience, low-rate for mobile phones, high-rate for home devices, with homogeneous sound whatever the encoder used.

Finally, the SOUND4 STREAM x8 adapts to most of the standards used for streaming delivery systems - Flash, Darwin, Helix, Wowza, Icecast 2, Shoutcast v1 & v2, etc.


SOUND4 STREAM x8 and the Livewire standard

Livewire* is the popular IP-Audio networking standard which uses Ethernet to provide an easy way of routing and sharing audio and logic throughout the broadcast plant.

"Everyone agrees that IP-Audio is the future. There are already more than 1,500 studios around the world powered by Axia Livewire networks," says Axia Vice-President Marty Sacks. With the Livewire* system, a single Ethernet cable carries in real time all mics, as well as uncompressed digital audio, device control messages, program-associated data and even routine network traffic. One of the advantages of the SOUND4 VOICE ULA is its capacity to work as a resource that can be routed and inserted anywhere in the Livewire* chain.


Advanced Metadata Management

In terms of Metadata, the SOUND4 STREAM x8 is compatible with different standard formats and can interface with many types of automation software thanks to an XML-based gateway (A2I, BE, BSI, Enco, Jazler, Netia, NextGen, RCS, Winmedia).

Software Options Available *

  • Mix Engine & 3D matrix

* All Software Options are subject to an additional payment. For pricing please Contact Us.

The STREAM x8 is a device that impresses with the trademark SOUND4 quality. It was developed as the ultimate processing/coding solution and its top performance is guaranteed by a number of outstanding features.



  • PCI Express x1 card (compatible with x2, x4, x8 and x16 slots)
  • 100% autonomous in terms of resources
  • Ethernet 100 Base T Livewire compatible
  • DSP computing power: 8 Giga Flops (Sharc 40 bits with floating point)
  • GUI and drivers compatible 32 & 64 bits (Windows 7, Windows 8 & 8.1, Windows 10, Windows 11, 2008 R2, 2012 and Linux (Debian))
  • Multicard driver (the quantity of PCIe slots will be equal to the number of cards admissible in the same PC)
  • Start-up time of the SOUND4 STREAM x8: 15 seconds max to being On Air
  • 100% upgradeable and rapid update (only a 15-second sound interruption).



  • 4 to 8 independent channels
  • HQ sound, 192 kHz sound processing
    • AGC
    • Tone FX
    • 3-Band Processor
    • 4-Band Limiter
    • Brickwall Limiter
  • Presets centralization and sharing
  • Link & Share ready
  • Ultra-low delay ~5 milliseconds


      • MP3: 32 to 320 kbps
      • AAC: 8 to 264 kbps
      • HEAAC v1: 24 to 72 kbps
      • HEAAC v2: 16 to 44 kbps


      Compatible with All Delivery Standards

      • Darwin
      • Flash
      • Helix
      • Shoutcast v1 & v2
      • Icecast 2
      • Wowza

      Protocols: HTTP/ICY, RTSP/RTP Unicast, RTP Multicast, RTMP, RTMPE, RTMPS, RTMPTE, RTMPTS.

      Automatic SDP files generation for RTP Multicast receivers.


      User-friendly Control Interface

      Through the years, SOUND4 has come to be associated not only with the quality of our products, but also with their user-friendly interfaces. The SOUND4 VOICE ULA is part of this long tradition, with a number of assets to allow users easy access, setting and operability.

      • Easy control of all radio at your fingertips.
      • Sound setting from one single screen - you no longer need to open and close windows to go from one function to another.
      • Two modes - “Basic” and “Advanced”. Basic - provides simplicity and rapidity; Advanced - allows you to explore all of the processor functionalities.
      • Ultra-rapid VU meter 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 remote connection manager to control several processors.
      • Works with the following operating systems: Microsoft XP SP3, Seven 32& 64 bits, Height 32 & 64 bits, Height 1, 2008 R2, 2012, Linux (Debian).


      Preset Sharing

      Thanks to Preset sharing, it is possible to share presets between cards. This is a real advantage for operators who will use a large number of cards, as their own preset will be accessible from all channels.

      Practically there is no limitation for the Preset Sharing functionality, even if cards are not in the same network map. Preset Sharing uses UDP protocol.

Wide Band AGC

One of the main processing functions of the SOUND4 STREAM x8 is the Wide Band AGC - automatic gain control, operating in broad band. Its main purpose is to “even out” gaps of levels in terms of processing.

The algorithm which was especially developed for this AGC is of the predictive type. It allows very high sound variations without any sort of pumping. Compared with other processors, control of the input gain is greatly facilitated.


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 STREAM x8 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.


The 3-Band Process

The 3-band Process is the heart of dynamic processing. The SOUND4 VOICE ULA 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 Process is extremely powerful and capable of absorbing very high variations of sound on its own, which is why it is not always necessary for the input AGC to operate.


The 4-Band Limiter

The main purpose of the 4-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 Brickwall Limiter

The Brickwall Limiter is an advanced algorithm which provides strong gain limitation, guaranteeing that there are no overs and no clipping.

  • Livewire Inputs & Outputs
    TypeLivewire (Standard or Live Stream)
    LevelAdjustable through SOUND4 x8 user software
    ConnectorEthernet 100 base-T (on-board)
  • 8-Channel Audio Driver Inputs & Outputs
    Linux (Debian)Alsa
    Microsoft WindowsWDM/Direct Sound compatible 32 & 64 bits: Windows 7 - Windows 8 - Windows 10 - Windows 11 - Windows Server 2008 R2 - Windows Server 2012
  • PCI Express Board
    StandardPCI express x1 (compatible with x2, x4, x8, x16 slots)
    Board Consumption10 watts typical
    Size185 x 106 mm (without connectors)
  • Compatible Operating System for SOUND4 PCIe Cards
    LinuxLinux (Debian)
    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
  • Compatible Operating System for SOUND4 Remote Software
    LinuxLinux (Debian)
    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
  • PC to Client Communication Interface
    TCP/IPClient (Remote) / Server (hosting PC) Architecture via Ethernet
    Link & Share100% of all parameters are accessible via telnet protocol
  • Streaming Codecs
    MP332 to 320 kbps
    AAC8 to 264 kbps
    HE-AAC v124 to 72 kbps
    HE-AAC v216 to 44 kbps
  • Protocols
    :RTSP/RTP Unicast
    :RTP Multicast
  • Delivery Server Compatibility
    :Icecast 2
    :Red 5
    :Shoutcast v1 & v2
  • Size And Weight
    Dimensions (WxHxD)190 x 21 x 106mm
    Shipping Weight54 x 172 x 230mm / 0.220kg
    HS Code8473302000
  • User Manual

    SOUND4 STREAM X User Manual (English)
    Size: 3.54 MB Download

    SOUND4 STREAM X User Manual (Spanish)
    Size: 6.55 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...

    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.

    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.

  • 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.

    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 STREAM x8 is offering as an option the Kantar Media Audio Watermarking Technology for audience rating.

Today, listening Internet radio constitutes a significant market share which also needs to be surveyed. In SOUND4 STREAM x8, watermaking is done directly in the streaming engine after the processing stages to ensure maximum watermarking quality.

IMPORTANT: SOUND4 STREAM x8, is only able to watermark encoded streams, AES-67/LW outputs are not watermarked. If you need to watermark AES-67/LW outputs, please use SOUND4 STREAM x2 or x4.


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.