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The SOUND4 IMPACT – Advanced 6-Band Processor is a 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 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 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 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.


Software Options Available *


SOUND4 IMPACT 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.


A full list of all software options is available below:

  • Basic RDS Encoder
  • Full RDS Encoder
  • Streaming Extension
  • IP Tx
  • IP Tx2
  • IP Rx
  • IP Rx2
  • IP RX + Tx
  • Dual IP Tx + RX
  • IP Pass Through
  • Emergency URL Player
  • Emergency Audio Player


* All Software Options are subject to an additional payment. 


SOUND4 IMPACT comes in a convenient, compact 1U case and has a dual power supply, which is a standard feature of all SOUND4 In-box products and provides constant, uninterrupted operation of your unit. Combined with an affordable price and the easy-to-use remote control interface, this is the ultimate sound processing tool.

SOUND4 IMPACT Audio Processor

    • Dual Power supply
    • 2 Processing path: FM & HD
    • Inputs: 2 AES/EBU 32 to 192 kHz, 2 analog, 2 AES-67/Livewire, 2 IP Codec (SOUND4 IP CONNECT), 2 SUB (insert for RDS/RBDS...)
    • Outputs: 2 AES/EBU 32 to 192 kHz, 2 analog, 2 AES-67/Livewire, 2 IP Codec (SOUND4 IP CONNECT), 2 MPX
    • Digital AES/EBU and wordclock synchronization inputs.
    • 3 independent Ethernet ports: Admin, AES-67, IP-CONNECT
    • GPIO: 8 inputs, 8 outputs, advanced management with scripts
    • GPS Sync for System time and AoIP Sync
    • Micro SD: High capacity management, SDXC compatible standard (up to 2TB), for music storage and more
    • Two USB ports: front and rear (for preset & upgrade loading and other functionalities)
    • Headphone output on front panel with the possibility to listen each Input or Output
    • Full Routing management: Patch points with Insert and Mix on all stages, routing of signals to any Inputs and Outputs
    • Automatic failover input switching with crossfade
    • Diversity Delay: up to 20 seconds
    • Relay switch for automatic by-pass
    • Fully controllable from front Panel
    • GUI remote control compatible 32 & 64 bits - Windows 7, Windows 8 & 8.1, Windows 10, 2008 R2, 2012 and Linux (Debian)
    • HTML5 GUI: Inputs and outputs setup, preset change, upgrades...
    • Start-up time of SOUND4 IMPACT: 2 seconds to be on air (Analog Input or AES/EBU input)
    • Total DSPs computing power for audio Processing: 16,2 Giga Flops (Sharc 40 bits with floating point + other DSPs)
    • Total ARMs computing power for product management and extra functions: 4 GMips

    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 - Basic and Advanced. Basic mode provides simplicity and rapidity; Advanced mode allows you to explore all the processor functionalities. There are also ultra-rapid VU meters for true control over modulation
    • Advanced meterings with FFT and MPX Power
    • Unlimited “Undo/Redo” versioning function for presets with possibility of recall
    • Innovative “compare to reference” function
    • Log comment feature follow each preset
    • A readable and interactive path 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 output
    • Voice Smoother to avoid distortion problems on certain voices
    • BS412 compliant MPX power controller
    • Typical processing delay at 1 KHz:
      • HD output: 15.2 ms
      • FM output: 28.1 ms
      • MPX output: 33.8 ms

    Other key points:

    • 19 kHz embedded pilot to gain close to 1 dB more in loudness!
    • Auto-Mono: Switch off pilot 19 KHz on mono sources for better receiving in FM
    • Stereo Matrixing for better stability in loudness and sound tone when the receiver switches from mono/stereo/mono
    • Adjustable Filters Frequencies in 2-band AGC, 6-band Process and 3-Band Limiter


    • Basic RDS encoder (with scrolling PS)
    • Full RDS (UECP-compatible)
    • IP Codec - SOUND4 IP CONNET (manage up to 32 Links!)
    • Emergency Player: Audio program backup, 2 music libraries, 1 Jingle Library + rules management
    • Audio streaming - 3 encoders (MP3, AAC, HE-AAC v1 & v2), compatible with all delivery servers (Icecast, Shoutcast v1 & V2, HLS, Flash, Wowza)
    • Link & Share - 100% of all parameters are accessible via the telnet protocol
    • Software Panels - the device allows you to create your own panels with unlimited functionality
    • Preset Sharing - the ultimate solution to manage an unlimited number of processors. All of them are automatically updated if one of them is modified
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