D20 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 equalizers, 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 utilizing 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/AES70 via Ethernet and through CAN-Bus respectively.

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Introductory video

Introductory video

Tutorial videos

Tutorial videos

The D20 Touring rack assembly

The D20 Touring rack assembly

3xD20 Touring Rack


The D20 Touring rack assembly is designed as a fully equipped and prewired system rack, providing mains power distribution, connector interfaces and all internal cabling for three D20 amplifiers1. It is equipped with a 32 A CEE mains power connector, a mains distribution device with a 32 A mains link, and a loudspeaker connector panel.

All internal audio and remote connections are fully prewired. A loom comprising two AES3 cables and one CAT5/etherCON2 is supplied, providing patch cabling for a network connection and four AES3 channels. The D20 Touring rack assembly is provided with either a DS10 Audio network bridge, which comes supplied with all necessary cabling, or a 1 RU drawer.

The DS10 Audio network bridge interfaces between Dante networks and AES3 digital audio signals, while also providing distribution of Ethernet control data. The DS10 can deliver up to sixteen Dante network channels via AES3 digital signal outputs, and is intended to integrate directly into a D20 Touring rack assembly. The front panel of the DS10 is designed to align with the input panel of the D20 Touring rack assembly. The DS10 can be powered by one of the auxiliary mains outputs. All necessary patch cabling and links are supplied with a D20 Touring rack assembly including a DS10.

The 10 RU Touring rack houses a 19" internal shockmount steel frame accommodating three D20 amplifiers and the requisite connection panels. It comes with two sliding doors, a perspex window at the front, four wheels, six handles and recessed stacking moulds at the top.

The DS10 Rack upgrade kit contains everything required to replace the drawer within the D20 Touring rack assembly with a DS10. This kit includes a DS10 Audio network bridge, a powerCON2 to powerCON2 mains cable, an Ethernet patch cable and two AES3 XLR patch cables.


1 The Touring rack assembly does not come with D20 amplifiers.

2 etherCON® and powerCON® are registered trademarks of Neutrik AG, Liechtenstein.





Controls and indicators  
POWER Mains power switch
SCROLL/EDIT Digital rotary encoder
Display Colour TFT touchscreen, 3.5"/320 x 240 pixel
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
CF = 12 dB at 4 / 8 ohms
4 x 1000/800 W
4 x 1600/800 W
S/N ratio (unweighted, RMS)
Analog input
Digital input
> 104 dBr
> 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.



Title Language Date Size
D20 Manual 1.8 en English 31.07.2018 17 MB
D80/D20 Firmware V2.12.00 Release notes International 05.04.2018 81 KB
EU Declaration of Conformity (CE) International 06.03.2018 53 KB
Software Newsletter 2016-10 International 30.09.2016 2 MB
Software Newsletter 2017-04 International 14.06.2017 924 KB
Software Newsletter 2017-12 International 04.12.2017 1,015 KB
The Amplifiers/Software brochure English 06.04.2018 7 MB
TI 310 Ethernet networking 1.1 English 05.12.2014 1 MB
Z5560 D20 Touring Rack CE Manual 1.1 English 07.02.2017 4 MB


Architectural specifications

Architectural specifications

The amplifier shall be four channel incorporating digital signal processors (DSP) to provide loudspeaker specific configurations and functions and dedicated protection circuits. It shall be equipped with digital and analog signal inputs as well as link outputs, remote control and monitoring capabilities via CAN-Bus or Ethernet (OCA). User interface shall be via a TFT color touch screen in conjunction with a digital rotary encoder and via remote.

Four input and input link connector shall be provided while two of the connectors shall be configurable for analog or digital (AES3) audio signals.
Analog inputs shall be electronically balanced with an input impedance of 38 kOhm while the analog link output is linked in parallel to the analog input connector.
The digital inputs shall be transformer balanced with an input impedance of 110 ohm while the digital link output shall be electronically balanced providing analog signal buffering (refresh) and power fail relay (Bypass). Sampling shall be 48 / 96 kHz / 2 Ch/n and Word-Sync: PLL-locked to source (slave mode) synchronization.

Signal processing shall utilize 96 kHz sampling rate with 27 Bit ADC / 24 Bit DAC conversion while the latency shall not exceed 0.3 msec.

The output connector options shall be 4 x NL4 for dual channel mode and 2 x NL4 for mixed top/sub and/or 2-way active modes. A four channel out connector (NL8) shall be provided for loudspeaker multicore purposes.

Output configurations shall be selectable for dual channel, mixed top/sub and 2-way active modes.

It shall incorporate two user definable 16-band equalizers for independent application to each channel allowing parametric filters, notch, hi- and lo- shelve filters as well as asymmetric filters.

A signal delay capability of up to 10 sec. (3440 m / 11286 ft) shall be incorporated for independent application to each channel.

It shall contain a signal generator offering pink noise or sine wave program.

Load monitoring and System check functions shall be included to ascertain the status of the loudspeaker impedance. Load monitoring shall allow impedance monitoring to determine the status of an LF or HF driver in systems with multiple elements, even if these are crossed over passively.
Input monitoring shall be included to allow detection of incoming pilot signals.

Compensation for cable length shall be incorporated to improve impulse response.

A Fallback function shall be available to enable the definition of primary (Regular) and secondary (Fallback) signal paths for analog and digital input signals with two different modes (Manual or Auto). It shall ensure that any secondary or emergency signal fed to the Fallback inputs is transmitted when required.

The Override function shall be available to allow a dedicated analog input to be set as a major signal path with highest priority for general messages or emergency services.

An AutoStandby function shall automatically switch the amplifier to Standby mode after a predefined time when the incoming signal level at the individually specified inputs drops below a defined threshold. The function shall be independent of the mute status of the respective channels. An AutoWakeup function shall automatically repower the amplifier, when an input signal is present and exceeds a defined threshold.

A universal range switched mode power supply shall be incorporated and allow mains range of 100 to 240 V AC, 50 - 60 Hz mains power supply voltages. Mains voltage monitoring, mains inrush current limiter, self-resetting overtemperature, under- and overvoltage protection shall be incorporated.
Power factor compensation (PFC) shall be incorporated to provide a clean and efficient sinusoidal current draw.

It shall have temperature and signal controlled fans for cooling the internal assemblies.

The power amplifier channels shall have ground fault protection, output pop-noise suppression, DC offset protection, output HF voltage limitation, output current limitation/protection and self-resetting overtemperature protection.

The output power shall be 4 x 1000/800 W into 4/8 ohms at a crest factor (CF) of 6 dB, all channels driven.
Damping factor (20 Hz – 200 Hz into 4 ohms) shall be >80 while the S/N ratio (unweighted, RMS) shall be >104 dBr (analog input) and >106 dBr (digital input).

The dimensions (HxWxD) shall not exceed 2RU x 19" x 460 mm (2RU x 19" x 18.1") and shall weigh no more than 10.8 kg (23.8 lb).

The amplifier shall be the D20 by d&b audiotechnik GmbH.