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d&b audiotechnik D20


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Product Overview

2 RU 4-Channel Amplifier

The 2 RU four channel D20 amplifier is ideally suited to mobile and installation applications which require low to medium Sound Pressure Level (SPL) capabilities. The D20 features the same Digital Signal Processing (DSP) platform as the latest generation of d&b amplifiers, containing configurations for all d&b loudspeakers except the J-Series and the M2 monitor, plus a linear mode.

The signal delay capability enables user definable settings of up to 10 s (= 3440 m/11286 ft), which can be applied independently to each channel. The same applies to the two 16-band equalisers, providing optional parametric, asymmetric, shelving or notch filtering.

The D20 incorporates a colour TFT touchscreen, offering quick access to the menu structure, while the rotary encoder can be used for fine adjustment. The front panel and the integrated touchscreen are tilted up for easy operation when the amplifier is below eye level.

The equal ratio of signal input to amplifier output channels increases application flexibility particularly for monitor, frontfill or effect channel use. The LoadMatch function integrated within the D20 amplifier electrically compensates for the properties of loudspeaker cable used.

The D20 incorporates Class D amplifiers utilising a power supply with active Power Factor Correction (PFC) suitable for mains voltages 100 V - 240 V, 50 - 60 Hz and maintains a stable output when used with weak or unstable mains supplies. An NL8 provides all outputs on a single connector for loudspeaker multicores. Dual channel mode is driven through four individual NL4 connectors, while Mix TOP/SUB and 2-Way Active mode output configurations for applicable d&b loudspeakers are available via two central NL4 connectors. etherCON and RJ 45 connectors enable access to the d&b Remote network through OCA via Ethernet and through CAN-Bus respectively.


D20 amplifier. The story behind


D80, D20 amplifiers tutorial 1 – Overview and navigation


D80, D20 amplifiers tutorial 2 – Device setup: Input modes


D80, D20 amplifiers tutorial 3 – Device setup: Output modes


D80, D20 amplifiers tutorial 4 – Device setup: Remote view


D80, D20 amplifiers tutorial 5 – Channel setup




Controls and indicators

  • POWER: Mains power switch
  • SCROLL/EDIT: Digital rotary encoder
  • Display: Colour TFT touchscreen, 3.5"/320 x 240 pixel
  • ISP, GR, OVL A/B: Colour TFT


Digital Signal Processing

  • Equalizer: 2 x 16-band PEQ/notch/shelving/asymmetric
  • Latency analog and digital inputs: 0.3 msec.
  • Delay setting: 0.3 - 10000 msec.
  • Configurations: current d&b loudspeakers (except J-Series and M2 monitor) and linear mode
  • Function switches: d&b loudspeaker specific circuits
  • Frequency generator: Pink noise or Sine wave
  • Sampling rate: 96 kHz/27 Bit ADC/24 Bit DAC



  • INPUT ANALOG (A1 - A4): 3 pin XLR female
  • ANALOG LINK (A1 - A4): 3 pin XLR male
  • INPUT DIGITAL (D1/2, D3/4): 3 pin XLR female AES 3
  • DIGITAL LINK (Output): 3 pin XLR male
  • Sampling Digital AES/EBU: 48 kHz/96 kHz
  • Speaker outputs A/B/C/D: NL4
  • Mix TOP/SUB / 2-Way Active output A/B and C/D: NL4
  • 4 Channel output: NL8
  • CAN: 2 x RJ 45 parallel
  • ETHERNET: 2 x etherCON®, 10/100 Mbit Ethernet
  • Mains connector: powerCON®


Data (linear setting with subsonic filter)

  • Maximum output power per channel (THD + N < 0.5%, all channels driven)
    CF = 6 dB at 4 / 8 ohms: 4 x 1000/800 W
    CF = 12 dB at 4 / 8 ohms: 4 x 1600/800 W
  • S/N ratio (unweighted, RMS)
    Analog input: > 104 dBr
    Digital input: > 106 dBr


Power supply 

  • Type: Universal range switch mode power supply with active PFC
  • Rated mains voltage: 100 - 240 V, 50 - 60 Hz


Dimensions, weight

  • Dimensions (H x W x D): 2 RU x 19" x 460 mm/18.1"
  • Weight: 10.8 kg/23.8 lb


Application information is presented for guidance only. d&b reserves the right to make any necessary changes to the products and the published specifications. As part of the ongoing development program d&b tries to maintain the highest degree of product compatibility.

Product Downloads

  • D20 Mobile Amps & Software Brochure PDF 7.6 MB
  • D20 TI 310 Ethernet Networking V1.1 PDF 1.1 MB
  • D20 Mobile Sound Products Brochure PDF 4.8 MB


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*Prices are in AUD, include GST and are subject to change. Please call National Audio for pricing and availability on the D20.