Project Description

Jünger Audio D*AP4 FLX Digital Audio Processor

Highly configurable four channel audio processor for all broadcast applications: base unit offers AES3 I/O and multichannel true peak limiting; numerous other options –including loudness management, dynamic range control and monitoring functions – may be added as needed by software license to suit individual requirements. Numerous alternative I/O options are also available in the form of hardware modules.

Standard features:

  • 4-channel software-configurable audio processing platform
  • True peak limiting
  • 2 x AES3 inputs, 2 x AES3 outputs (BNC and XLR)
  • Comprehensive web GUI for unit setup and control
  • GPIO port (8 in, 8 out)
  • Network control via Ethernet (Ember+)
  • External sync input
  • Wordclock output
  • Updates may be applied via USB port or network


  • Alternative I/O modules (fit rear panel expansion slot)
    • SDI I/O (3G/HD/SD): 16-channel embedder/de-embedder
    • 8-channel AES3 I/O (25-pin Dsub)
    • 4-channel analogue I/O (25-pin Dsub)
    • 8-channel analogue output (25-pin Dsub)
  • Additional processing features enabled by software licence:
    • Jünger Level Magic II™ loudness management
    • Jünger J*AM LoudnessLogger™ with monitor and analyser
    • Dynamics processing (compressor/expander)
    • 5-band parametric EQ with Spectral Signature™ dynamic filtering
    • Fail-over function
    • Voice-over capability
  • X*AP RM1 Universal Remote Control Panel


  • Internal Universal dual PSUs, with separate AC inlets and switches
  • 1U rack-mounting unit

The Jünger D*AP8 FLX digital audio processor is an 8-channel version of the D*AP4 FLX. The extended option set includes a range of Dolby® encoder and decoder modules (Dolby® E/D/D+/AAC/HE-AAC), and Upmix/Downmix capability.


The D*AP4 FLX is part of Jünger’s D*AP processing platform concept: the base unit is a four-channel processor with extensive GUI control via a web browser. The unit is primarily intended for use in broadcast environments where digital audio is standard, with two AES3 inputs and two AES3 outputs, available on both BNC and XLR connectors. True Peak Limiting is provided as standard.

Additional I/O connectivity may be added in the form of optional cards which plug into a rear panel expansion slot. The control system permits any input and output to be routed to/from the internal DSP as required. The range includes an SDI I/O card which caters for SD, HD and 3G formats and is compliant with SMPTE 424/425M, 292M and 259M. The D*AP4 FLX can de-embed the 16 channels of audio and any four channels can be routed internally to the audio processing section. De-embedded channels may also be routed to the unit’s AES3 outputs to feed external equipment. The SDI I/O module also supports embedding, allowing signals from elsewhere in the unit’s architecture to be inserted into the SDI stream for onward transmission. The outgoing SDI video can be delayed to compensate for internal audio processing.

The D*AP4 FLX’s standard AES connectivity can be increased by adding an AES I/O card. This provides eight additional input and output channels (4 x AES3 in each direction), via a 25-way Dsub connector. For facilities using MADI or Dante™ VoIP as their audio backbone, 16-channel MADI and Dante™ I/O cards are also available.

Two analogue I/O modules are also available: one has four line inputs and four line outputs, the other has eight line outputs. All inputs and outputs are balanced and capable of +24 dBu maximum level.

The base unit and many of the optional I/O cards feature automatic hard relay bypass, ensuring signal continuity in the event of PSU failure.

Users can customise the D*AP4 FLX for their particular application by specifying which processing options are to be enabled. This is done by software license so additional features can be added at a later date if needed with no hardware modifications.

Jünger’s Level Magic II™ addresses the common problem of significant – and often disturbing – changes of loudness occurring when switching between programme sources, particularly during unattended operation. The algorithm ensures that program levels remain within predetermined tolerances without any colouration, pumping, breathing, distortion or modulation artefacts, no matter what the programme source. Level Magic II™ is compliant with all current broadcast audio loudness recommendations including ITU-BS.1770, ATSC A/85 (2011/2013), ARIB TR-B32 Free TV OP-59, Portaria 354 and EBU R128. LoudnessLogger™ can be added if a record needs to be maintained of broadcast loudness levels.

Flexible control of audio dynamic range is possible with the addition of the compressor/expander option.

Jünger’s Spectral Signature is a dynamic filtering technique which permits the operator to analyse a known sample of programme which is used as a “reference”. The algorithm adjusts the spectral content and dynamic range of all programme material to match this reference as closely as possible, ensuring that all audio output has a similar sonic character. Other software options include Fail Over, which automatically switches the input to a nominated secondary input in the event of input signal failure, and Voice Over, which uses a second input to trigger audio ducking.

Full unit configuration and control is available from anywhere in a user’s facility through a comprehensive set of web pages; to which access may be restricted with passwords. Network control using Ember+ is also implemented, allowing the unit to be controlled by local or facility-wide broadcast control systems. If dedicated hardware controls are preferred, the optional X*AP RM1 remote control panel may be purchased; this can control multiple units from the Jünger range, and includes multicolour bargraph meters, OLED graphic displays and programmable hotkeys. The 8-way GPIO port allows the unit to be interfaced to almost any other control equipment for basic signalisation and commands.

The D*AP4 FLX is a 1U rack-mounting unit with dual, internal redundant PSUs as standard (with separate IEC inlets and AC switches).

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