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Klark Teknik 4 In 8 Out Digital Loudspeaker Processor

Product Code KLDN9848E
Manufacturer Klark Teknik

Request more information or contact us now for purchasing information.


The digital system controller has been one of the fastest developing areas of signal processing in recent years. This is principally because it allows designers to combine a number of key control functions within a single device, thereby lowering overall costs and adding convenience. Unfortunately, in many cases the relevance of the audio performance of the device has been overshadowed by the ‘bells and whistles' functionality of the unit, ultimately somewhat defeating the object of the exercise. With the new KLARK TEKNIK Helix DN9848E system controller, no compromise has been made in either the feature set or the audio performance.

The Helix DN9848E brings a new level of flexibility to system control whether for live production or installation use. Since there is no preset routing within the device, it can be easily preprogrammed to perform almost any system-control task. Limiters and compressors on all outputs plus compressors on all inputs provide ultimate speaker control and protection, whilst no less than ninety-six bands of fully parametric EQ allow for both room and system equalisation. Best of all, there's enough processing power onboard to allow every function to be available all the time, regardless of what is already in use.

The DN9848E System Controller features AES/EBU digital inputs as standard. Whilst the internal sample rate of the DN9848E unit remains at 48kHz, these digital connections are all 96 kHz compatible allowing easy interface with any other digital device featuring the higher sample rate. The unit now features a dual port Ethernet communications interface. This is to facilitate much faster communication, response and metering when controlling multiple units, than was previously possible with serial comms.

The DN9848E incorporates some customer-requested operational additions. The user-configurability of the unit includes full matrix mixing capability between inputs and outputs, providing an unequalled level of flexibility. Whilst programming, inputs or outputs can now be ‘ganged' so that the user can enter program data into one input or output menu and all connected inputs or outputs will be simultaneously updated. Input and output parameters can also be copied from one to another. The internal memory structure has also been revised such that it is now possible to back up the RAM-based system memories into non-volatile flash memory.

The proprietary ELGAR software coupled with Helix System Controller Remote Control Software (RCS) Add-In allows simple up-and-down-loading of system parameters into the FLASH memory locations, as well as storage and transmission of system information.

Should for example you need a new system configuration to be loaded into a unit on the other side of the world? No problem, simply email the ELGAR file to wherever it needs to go, it can then be uploaded into the unit in seconds.


  • 4 input and 8 outputs, 1RU
  • 12 delay lines / 16 all-pass filters / 16 hi & lo pass
  • 4 comps / 8 look-ahead limiters / 96 bands of PEQ
  • Grouping facility allows unique system control
  • All facilities available all the time Full matrix mixing between inputs and outputs
  • Ganging of inputs and outputs
  • Input and outputs parameters can be copied between one another
  • All facilities available all of the time
  • Flash memory locations
  • Dual Ethernet ports AES/EBU digital inputs
  • Totally flexible routing allows DN9848E to run almost any type, configuration or make of system
  • It also allows amp racks to be truly multi-functional because they can be reconfigured to any application quickly and with no re-patching
  • Full Remote control, wired or wireless, via PC and ELGAR and System Controller Remote Control Software


Architect's & Engineer's Specification:

The Loudspeaker Processor shall provide four analogue and four digital input channels and eight output channels with fully featured matrix mixing in a standard 1U 19" rack mount chassis.

Each input channel shall include: input name, input gain control, input source select (analogue or digital), delay up to one second, eight parametric EQ stages (+6 dB boost, -18 dB cut) and a compressor.

Digital inputs shall run at any sample rate up to 96kHz with internal sample rate conversion. The sample rate converter can be bypassed when the incoming digital signal has a sample rate of 48kHz.

Each output channel shall include: output name; configurable routing; delay up to 300 milliseconds; two cascaded all-pass phase correction filters, low and high pass crossover filters with slopes of 6, 12, 18, 24, 36 and 48 dB per octave and options of Linkwitz-Riley, Butterworth and Bessel characteristics where appropriate; six parametric EQ sections with up to 12 dB of cut or boost (optionally two of these stages are configurable as low frequency and high frequency shelf filters respectively); a phase invert function; an output level control; and a compressor and a limiter.

All delay times shall be set in milliseconds and microseconds, or in distance units (metric and imperial) with a temperature correction facility.

Each Loudspeaker Processor shall meet or exceed the following performance specifications:

Frequency response: +/- 0.3dB (20Hz to 20kHz)
Distortion (THD+N): <0.02% @ 1kHz, +8dBu
Dynamic Range: >114dB (20Hz to 20kHz unweighted)

All analogue inputs and outputs shall be electronically balanced and use XLR connectors. All digital inputs shall be 110O AES/EBU and use XLR connectors. All parameters shall be displayed and adjusted via an alphanumeric LCD display, three rotary encoders and individual menu buttons for each input and output channel.

There shall be provision for six user memories and in addition 32 system memories and 99 factory presets with a security lock-out feature. There shall also be a security lock-out feature that is enabled when the unit is under remote control.

The Loudspeaker Processor shall be provided with an RS-232 and Ethernet ports for remote control and software updates. The Loudspeaker Processor shall be controllable from the ELGAR remote control PC software

The unit shall be capable of operating from a 100V to 240V, ±10%.

The Loudspeaker Processor shall be the KLARK TEKNIK model DN9848E and no alternative option is available.

Technical Specification:

  • Digital Inputs Two 2-Channel Inputs
    Type AES / EBU
    Impedance 110O
    Sample Rate 44.1kHz, 48kHz, 88.2kHz*, 96kHz*
    Word Length 24-bit or 16-bit
    *SRC Input at these sample rates

  • Analogue Inputs Four
    Type Electronically balanced (Pin 2 Hot)
    Impedance (O) Balanced 20k
    Impedance (O) Unbalanced 10k
    Common Mode Rejection >80dB @ 1kHz 
    Maximum level + 21dBu

  • Audio Outputs Eight
    Type Electronically Balanced (Pin 2 Hot)
    Minimum load impedance 56O/20nF 
    Source impedance 56O
    Maximum level + 21dBu into > 2kO

  • Performance
    Frequency response (20 Hz to 20 kHz) +/- 0.3dB with all filters and EQ flat 
    Distortion (THD+N) <0.02% @ 1kHz, +8 dBu 
    Dynamic range (20 Hz to 20 kHz unweighted) >114dB

  • Input Processing (per channel)
    Input gain +12dB to -40dB in 0.1 dB steps plus Off
    Parametric EQ 1-12
    Frequency range: 20Hz to 20kHz in 21 steps per octave
    Boost/cut: +6/-18dB in 0.1dB steps
    Q: 3.0 to 0.08
    Threshold: +21dBu to - 10dBu in 0.1dB steps
    Attack: 40us to 100ms
    Insert: On/Off
    Release: 10ms to 2000ms
    Ratio: 1:1 to 5:1
    Knee: Hard/Soft
    Delay 0 to 1 second 342.25 m or 1122' 10" at 20(C) in 20.8us steps

  • Output Processing (per channel)
    Routing Full featured matrix mixing: any combination of inputs can be routed to any output in .1dB steps from 0dB to -40dB and OFF

    Delay 0 to 300ms (102.68 m or 333' 10" at 20(C)in 5.02 us steps)

    Phase correction filters 0° to 180° in 5° steps
    All pass filter 1st and 2nd order

    Low pass filter frequency range 20Hz to 20kHz in 21 steps per octave.
    Supported configurations are:
    Butterworth (6dB/Oct, 12dB/Oct, 18dB/Oct, 24dB/Oct, 36dB/Oct, 48dB/Oct)
    Linkwitz-Riley (12dB/Oct, 24dB/Oct)
    Bessel (12dB/Oct,18dB/Oct, 24dB/Oct, 36dB/Oct, 48dB/Oct)

    High pass filter frequency range 20Hz to 20kHz in 21steps per octave.
    Supported configurations are :
    12dB/Oct Peaking, 24dB/Oct Peaking
    Butterworth (6dB/Oct, 12dB/Oct, 18dB/Oct, 24dB/Oct, 36dB/Oct, 48dB/Oct)
    Linkwitz-Riley (12 dB/Oct, 24dB/Oct) 
    Bessel (12dB/Oct,18dB/Oct, 24dB/Oct, 36dB/Oct, 48dB/Oct)

    Peaking Filter Boost 0dB to +6dB in 0.1dB steps.

  • Parametric EQ 1
    Frequency range 20Hz to 20kHz in 21steps per octave.
    Low shelf filter Boost/cut +12/-12dB in 0.1dB steps
    Parametric EQ Q 3.0 to 0.08
    Shelf slope 6dB/Oct and 12dB/Oct

  • Parametric EQ 2-5
    Frequency range 20Hz to 20kHz in 21steps per octave.
    Boost/cut +12/-12dB in 0.1dB steps
    Q 3.0 to 0.08

  • Parametric EQ 6/ f
    F requency range 20Hz to 20kHz in 21steps per octave.
    Hi shelf filter Boost/cut: +12/-12dB in 0.1dB steps
    Parametric EQ Q 3.0 to 0.08
    Shelf slope 6 dB/Oct and 12dB/Oct

    Polarity invert Normal/invert

    Output gain +12dB to -40dB in 0.5dB steps plus Off

    Look-ahead limiter
    Threshold +21dBu to - 10dBu in 0.5dB steps
    Release: 10ms to 1000ms
    Knee: Hard/Soft

  • Compressor
    Threshold +21dBu to -10dBu in 0.1dB steps
    Attack 40us to 100ms
    Insert On/Off
    Release 10ms to 2000ms
    Ratio 1:1 to 5:1
    Knee Hard/Soft

    Mute On/off

  • Terminations 
    Audio inputs/outputs 3 pin XLR
    Ethernet inputs/outputs Ethercon
    RS-232 8 pin Mini-DIN socket (front)
    9 pin D-type (rear)
    World Clock BNC
    Power 3 pin IEC

  • Power Requirements
    Voltage / Consumption 100 to 240V a.c ±10% 50/60Hz < 60VA

  • Dimensions
    Height 44mm (1.75 inch) - (1U)
    Width 483mm (19 inch)
    Depth 287mm (12 inch)

  • Weight
    Nett 4kg
    Shipping 6kg

  • Trade Descriptions Act: Due to the company policy of continuing improvement,we secure the right to alter these specifications without prior notice.

Equipment available to buy from this site is for professional use only. Please note in certain countries some products listed may not be available from A.C. Entertainment Technologies Ltd.

E&OE. Information is subject to change without notice. The rights and ownership of all trademarks are recognised.


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