Fohhn, DI-2.4000 AES , DSP system amplifier, class D, 2x4000W / 4 ohms, extensive DSP functions, AES/EBU input (terminal block) and Fohhn-Net, power outlet with terminal block, black

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The Latest Generation of Digital High-Performance Amplifiers. Made in Germany. Made by Fohhn.

The new DI-Series digital amplifiers have been developed and manufactured in house by Fohhn in Germany. At every stage of development, new intelligent technologies have been implemented. The DSP-controlled amplifiers perform at the highest level and guarantee maximum operational reliability, highest power density and excellent sound.

Since 2002, Fohhn has been developing extremely high quality, reliable digital electronics that have been consistently incorporated into the company’s own product lines. The DI-Series amplifiers represent 15 years of know-how in digital electronics, with a great many customer wishes brought to fruition as a result.

Developed for mobile sound reinforcement applications and fixed installations, the amplifiers offer all the essential features plus virtually unlimited connectivity with regard to audio signal inputs. Even if you opt right now for an AES/EBU, Dante™, Optocore or Analog option, you are not permanently committed: The optional input interfaces can be changed, as required, customizing your amplifier to suit the relevant digital or analogue network.

Extensive DSP input and output processing enables you to intelligently adapt your loudspeaker systems to the particular sound reinforcement situation and room acoustic. All DSP functions can be controlled in real time using FOHHN AUDIO SOFT.

The DI-2.4000 has an output power of 4000 W / 4 ohm per channel, four input- and two output channels. It has a compact 2U / 19“ enclosure and weighs just 9.8 kg. The amplifier works extremely quietly and its fans are not used while idling. 

Important features at a glance:

  • developed for mobile applications and fixed installations
  • network compatible, remote control, remote monitoring
  • extensive DSP input and output processing
  • input options: AES/EBU (terminal block or XLR), Dante™, Optocore or Analog
  • output options: terminal block or Speakon connectors
  • microprocessor-controlled universal power supply, 100-240 V AC, with Power Correction Factor (PFC) and sensory functions for mains voltage, power consumption and temperature
  • Auto Power Save for fan-free idling, temperature-controlled fans
  • two configurable switching contacts, one fault contact
  • performance presets for all relevant Fohhn loudspeakers
  • up to 10 seconds peak power

Virtually unlimited connectivity
The DI-2.4000 is available with a range of different connection options. Input options include AES/EBU (terminal block or XLR), Dante™, Optocore or Analog (XLR). For outputs, you can choose between terminal blocks and Speakon connectors. Depending on the sound reinforcement requirement, the optional input and output interface modules can be swapped over. The amplifier is equipped as standard with digital AES/EBU inputs and terminal blocks. 

Innovative power electronics
At the heart of the DI-2.4000 is the in-house developed, digital, high-performance power supply. As with all amplifiers, this is largely responsible for the sound. It constantly analyses the supply voltage and processes it accordingly (Power Factor Correction). The power supply gives the CLASS D amplifier an enormous performance capability of up to 4000 W within a few milliseconds and a peak duration of several seconds! Therefore, during live music applications the amplifier can perfectly reproduce the full dynamic range across the entire audible frequency spectrum at any time. The result is a significant increase in the available peak power over several seconds. Due to its integrated microprocessor, the power supply is equipped with measuring, monitoring and communications functionality. As a result, important factors such as temperature, supply voltage and capacity can be monitored and controlled accordingly. 

Intelligent control – maximum reliability
The DI-2.4000 is equipped with highly efficient DSP technology. The integrated Fohhn Audio DSPs on each input and output channel include all the essential audio tools such as 10-Band Parametric EQ, Delay, X-Over, Phase, Dynamics Processor or Tone Generator. All settings can be saved as user presets and recalled in real time. Factory setup/performance presets are available for all Fohhn loudspeakers. These provide optimal protection for the speakers and ensure the best possible sound performance for the power level. 
The amplifier is network compatible and can be remotely controlled and monitored. Direct access to all presets and DSP functions is therefore guaranteed at all times. Up to 254 amplifiers can be centrally controlled within a network via FOHHN AUDIO SOFT. Seamless connection to all current media control systems is also possible.
An integral Power-Up Delay enables sequential (remote) power up of multiple connected amplifiers within a rack. For larger installations and live sound applications involving multiple systems, this function significantly eases the general handling. 

Quiet operation
The amplifier fans are temperature controlled and optimised for extremely quiet operation. While idling, the fans are not used (Auto Power Save function). The fan and filter foam can be manually cleaned, without the need for tools.

Amplifier technology Class D
Output power 2 x 4000 W / 4 ohm 
2 x 2000 W / 8 ohm 
(1 kHz, THD+N < 1 %)
Minimum impedance 4 ohm
Input channels 4
Amplifier outputs 2
DSP routing (matrix) 4 x 2
Frequency response 20 Hz – 20 kHz
S/N ratio >100 dB/A
THD+N 0.15 % (1 kHz, 8 ohm, 3 dB below clipping)
Dynamic range >120 dB
Remote control Fohhn-Net over RS-485, USB-C, Fohhn Audio Soft
Remote monitoring temperature, protect, AES/EBU signals, power supply, Fohhn-Net, Fohhn Audio Soft
Fault contact 1 x Relais, 2 x UM, 3-pin Phoenix
Switching contact load preset, standby on/off
Password protection yes
Auto Power Save adjustable from 1 s to 12 h, or never active
Protective circuit over voltage protection, over current protection, over temperature protection, short-circuit protection, DC protection, power on delay, soft start and inrush current limit
Power supply 100 – 240 V AC 50/60 Hz, universal power supply with Power Factor Correction (PFC)
Power consumption Maximum (RMS) 1800 W, idle state 80 W, auto power save 10 W, standby 5 W, power on/off switch / remote power off 2 W
Heat dissipation Maximal 300 W, 1020 BTU/h, 258 kcal/h (Pink Noise, 6 dB crest, 1/4 Pmax)
Temperature range 0 – 40°C
Cooling temperature-controlled fan
Weight 9.8 kg
Dimensions (W x H x D) 2 HE / 19″, 485 x 89 x 425 mm
Digital signal processors 2
Independent limiters 12
Selective 3-band limiting bass/mid/high
Band-specific time constants yes
Filter technology 80-bit double precision
Input AES/EBU 32 kHz – 96 kHz, 16/24 bit
Input DSP processing yes
FIR yes
Input Gain -80 dB – +12 dB
Routing Gain -80 dB – +12 dB
Output Gain -80 dB – +12 dB
EQ 6 x 10 fully parametric filters, Gain +/-12 dB, Frequency 10 Hz – 20 kHz, Q 0.1 – 100
Limiter, Compressor 6
Noise Gate 6
X-over 6 x Linkwitz-Riley 4th order (24 dB / octave), high pass 10 Hz – 20 kHz, low pass 10 Hz – 20 kHz
Delay 2 x 0 – 350 ms (0 – 120 m) outputs, 
4 x 0 – 88 ms (0 – 30 m) inputs
User presets 100
Speaker presets 100
System latency 1.2 ms
Connections and controls  
Controls Power on/off Switch
USB Config 1 x USB-C socket
Mains connection 1 x PowerCON
Fault contact (open/close) 1 x Phoenix 3-pin
Switching contact 1 and 2 1 x Phoenix 3-pin
Remote power in/out 2 x Phoenix 2-pin
Power Supply for extern small devices 24 V / 5 W 1 x Phoenix 2-pin
24 V / 5 W Power LED green = on
Standard Input Interface (AES/EBU)  
Inputs 2 x Phoenix 3-pin AES/EBU, 1 x Phoenix 3-pin Fohhn-Net
Outputs 2 x Phoenix 3-pin AES/EBU, 1 x Phoenix 3-pin Fohhn-Net
Signal inputs AES/EBU 32 kHz – 96 kHz, 16/24 bit
Signal outputs AES/EBU link out from input
Latency 0.0 ms
Input Interface (AES/EBU XLR), optional  
Inputs 2 x XLR AES/EBU, 1 x etherCON Fohhn-Net
Outputs 2 x XLR AES/EBU,1 x etherCON Fohhn-Net
Signal inputs AES/EBU 32 kHz – 96 kHz, 16/24 bit
Signal outputs AES/EBU link out from input
Latency 0.0 ms
Input Interface (Analog XLR), optional  
Inputs 4 x XLR analogue, 1 x etherCON Fohhn-Net
Outputs 4 x XLR analogue, 1 x etherCON Fohhn-Net
Signal inputs analog, max. level +15 dBu
Signal outputs analog link out from input
Frequency response 20 Hz – 20 kHz
THD < 0.003 % typ., < 0.0005 % 1 kHz 0 dBu
S/N ratio > 110 dB/A
Input impedance 10 k ohms
Latency 1.0 ms
Input Interface (Dante), optional  
Inputs 2 x RJ-45 1000BASE-T Ethernet, Dante and Fohhn-Net
Outputs -
Latency Dante +0.6 ms
Input Interface (Optocore), optional  
Inputs 2 x LWL, Optocore and Fohhn-Net
Output option (terminal blocks)  
Outputs 1 x Phoenix 4-pin
Conductor cross-section max. 6 mm² flexible, 10 mm² rigid
Output option (Speakon)  
Outputs 2 x Speakon
Display (front)  
Receive / Send LED remote control, Fohhn-Net
Ready LED blue = Power on, blue flashing = Sign
Protect LED red = Error / Protect / Standby
Input LED 4 x input signal LED, white = signal (> -50 dBFS), red = clip (> -3 dBFS)
Output LED 2 x output signal LED, white = signal (> -50 dBFS)
USB Config LED configuration via USB
Artikel document di-series_manual_en3
Merk Fohhn
BxDxH in cm 485 x 425 x 89mm
Aantal hoogte eenheden in HE 2
Gewicht in Kg 9.8 kg
Constructie materiaal Metaal
Verkrijgbare kleuren Zwart
Eindversterker laag ohmig
Klasse typering Klasse D
Aantal versterkerkanalen 2
Minimum impedantie 4
Vermogen aan 4 ohm 2x4000W
Vermogen aan 8 ohm 2x2000W
Aantal line inputs 4
Frequentie bereik 20 Hz – 20 kHz
Signaal/ruis verhouding >100 dB/A
Beveiliging over voltage protection, over current protection, over temperature protection, short-circuit protection, DC protection, power on delay, soft start and inrush current limit
THD 1 kHz, THD+N < 1 %
DSP ingebouwd
Remote control connector RJ45
19" inbouwbaar

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