d&b Audiotechnik D40 4-Channel DSP Amplifier (Used)

d&b D40 Amplifier

The d&b D40 amplifier is a professional four-channel mobile amplifier designed for demanding d&b audiotechnik loudspeaker systems. Combining high output power, advanced digital signal processing, loudspeaker management, network connectivity and Milan audio networking, the D40 provides a complete amplification and control platform for professional sound reinforcement.

With maximum output power of 4 x 2400 W into 4 ohms or 4 x 2000 W into 8 ohms, the d&b D40 is engineered for professional touring, live events, rental production and other applications where reliable system control and high-performance amplification are required.

The D40 features a 2 RU rackmount format, a 4.3-inch colour TFT touchscreen, integrated DSP, AES3 digital audio, analogue inputs and Milan network audio. It also provides Ethernet connectivity for remote control using d&b R1 Remote control software and the integrated web interface.

d&b D40 Amplifier Overview

The D40 is a mobile-specific four-channel amplifier from d&b audiotechnik. It combines amplification and loudspeaker management in a single rackmount unit, reducing the need for separate external processing equipment in compatible d&b systems.

The amplifier provides up to four output channels and is capable of delivering up to 2400 W per channel at 4 ohms, with a maximum output rating of 2000 W per channel at 8 ohms when all channels are driven under the manufacturer’s specified conditions.

The D40 also incorporates a switch-mode power supply with automatic mains range selection and active Power Factor Correction (PFC). The rated mains voltage range is 100 to 127 V or 208 to 240 V at 50 to 60 Hz.

Key Features of the d&b D40

– Four-channel professional power amplifier
– Up to 4 x 2400 W into 4 ohms
– Up to 4 x 2000 W into 8 ohms
– Maximum output voltage of 180 V peak
– Maximum output current of 35 A peak
– Integrated digital signal processing
– Milan network audio connectivity
– Four analogue inputs
– AES3 digital audio inputs
– Up to eight Milan audio input channels
– Integrated Ethernet connectivity
– 4.3-inch colour TFT touchscreen
– d&b loudspeaker-specific processing
– User-definable equalization
– Input and output delay functions
– d&b LoadMatch technology
– Automatic mains range selection
– Active Power Factor Correction
– 2 RU rackmount design
– powerCON TRUE1 TOP mains connection

 D40 Power Output

The d&b D40 provides four independent amplifier channels for professional loudspeaker systems.

Its maximum output power is rated at:

4 x 2400 W at 4 ohms

4 x 2000 W at 8 ohms

These ratings are specified by d&b audiotechnik with all channels driven and under the manufacturer’s stated test conditions.

The amplifier also provides a maximum output voltage of 180 V peak and maximum output current of 35 A peak.

This combination of output capability and integrated system processing makes the D40 suitable for professional d&b loudspeaker configurations where controlled amplification and system-specific processing are required.

 Advanced DSP and Loudspeaker Management

One of the key features of the D40 is its integrated digital signal processing.

The amplifier includes comprehensive loudspeaker management together with switchable filtering functions, equalization and delay capabilities. The DSP platform is designed to work with compatible d&b loudspeaker configurations and provides system-specific processing through the amplifier.

The D40 provides two user-definable 16-band equalizers. Available filter types include parametric EQ, notch, high shelving, low shelving and asymmetric filtering.

Input latency for analogue and digital inputs is specified at 0.3 milliseconds, while the available delay range extends from 0.3 milliseconds to 10 seconds.

A built-in frequency generator can produce pink noise or sine wave signals from 10 Hz to 20 kHz.

 Milan and Network Audio

The d&b D40 is Milan-enabled and incorporates network audio connectivity for professional digital audio systems.

The amplifier provides up to eight routable Milan input channels and includes an integrated Ethernet switch. Milan audio can be connected through the amplifier’s network interfaces, providing a digital audio networking option for compatible professional sound systems.

The D40 also provides Ethernet connectivity for system control and monitoring.

Remote control is available through the d&b R1 Remote control software, while the integrated web interface allows the amplifier to be accessed through a browser.

For professional sound companies operating larger systems, network-based control can simplify system configuration, monitoring and day-to-day operation.

## D40 LoadMatch Technology

The d&b D40 incorporates LoadMatch technology for applicable d&b loudspeakers.

LoadMatch is designed to compensate for the electrical characteristics of loudspeaker cable, helping the amplifier maintain the intended tonal balance when compatible cable lengths of up to 70 metres (230 feet) are used.

This is particularly relevant for professional touring and event applications where long loudspeaker cable runs can be required.

## D40 Connectivity

The D40 provides multiple audio and network connection options.

Analogue audio is connected through four three-pin XLR inputs with corresponding analogue link outputs.

Digital AES3 audio is supported through two digital input pairs, while digital link outputs are also provided.

For Milan network audio, the amplifier uses etherCON connections and an integrated AVB Ethernet switch.

Speaker outputs are provided through NL4 connectors, with additional NL8 and mixed TOP/SUB or two-way active output configurations available.

The amplifier uses a powerCON TRUE1 TOP mains connector.

## D40 Display and User Interface

The front panel of the D40 features a 4.3-inch colour TFT touchscreen with a resolution of 480 x 272 pixels.

The touchscreen provides access to amplifier configuration, operating information and monitoring functions.

The amplifier also incorporates a digital rotary encoder for navigation and adjustment.

This combination of touchscreen control and network access provides both local and remote options for configuring and monitoring the amplifier.

## D40 Frequency Response and Audio Performance

In Linear mode, the d&b D40 has a specified frequency response of 35 Hz to 25 kHz at -1 dB.

The manufacturer specifies a digital/Milan input dynamic range of up to 116 dB, or 119 dB with A-weighting, under the stated measurement conditions.

The amplifier’s specified analogue input dynamic range is up to 111 dB, or 114 dB with A-weighting.

These specifications are provided by d&b audiotechnik under defined measurement conditions and should not be interpreted as a direct prediction of the acoustic performance of a complete loudspeaker system.

## D40 Power Supply

The D40 uses an autosensing switch-mode power supply with active Power Factor Correction.

The amplifier supports:

100 to 127 V, 50 to 60 Hz

and

208 to 240 V, 50 to 60 Hz

The manufacturer’s datasheet specifies a rated mains current of 20 A for the low-voltage range and 13 A for the high-voltage range.

Typical power consumption is specified at approximately 21 W in standby and 130 W while idling, with peak output power consumption specified at 2900 W.

## D40 Protection Systems

The D40 incorporates multiple protection functions designed to protect the amplifier and connected system.

Mains and power supply protection includes overvoltage and undervoltage protection, an inrush current limiter and an internal fuse.

Output protection includes overcurrent protection, DC offset protection, an HF voltage limiter and pop-noise suppression.

The cooling system uses temperature-dependent fan speed together with self-resetting overtemperature protection.

These features are designed to support reliable operation in professional sound reinforcement environments.

## D40 Dimensions and Weight

The d&b D40 is designed as a compact rackmount amplifier occupying 2 rack units (2 RU).

Official dimensions are:

2 RU x 19 inches x 512 mm

The amplifier weighs approximately 13.8 kg (30.4 lb).

Its rackmount format makes it suitable for touring racks, mobile production systems, rental inventory and fixed rack configurations where compatible.

## Compatible d&b Loudspeaker Systems

The D40 is designed for use with current compatible d&b audiotechnik loudspeaker setups.

Current d&b documentation lists the D40 as an amplifier option for systems including the KSL, V-Series, Y-Series and T-Series, among others.

The current D40 product information states that it supports current d&b loudspeaker setups except GSL, SL-SUB, J-Series and M2.

Compatibility can depend on the loudspeaker configuration and current amplifier firmware, so the manufacturer’s current documentation should always be checked before configuring a system.

## D40 for Touring and Professional Events

The d&b D40 is designed specifically as a mobile amplifier and is well suited to professional applications where four-channel amplification, integrated DSP and network control are required.

Typical applications can include:

– Touring sound systems
– Concert production
– Festival sound reinforcement
– Corporate events
– Professional AV production
– Rental company inventories
– Theatre systems
– Live music venues
– Professional mobile PA systems
– Large-scale event production

The combination of four amplifier channels, integrated DSP, Milan connectivity and d&b loudspeaker-specific processing allows the D40 to function as both an amplifier and an important part of the system control architecture.

## Why Choose a d&b D40 Amplifier?

The D40 brings several professional functions together in one 2 RU amplifier platform.

Instead of relying on a conventional power amplifier combined with separate loudspeaker processing, the D40 integrates amplification, DSP, system-specific loudspeaker processing, network audio and remote control functionality.

For production companies and rental companies already operating d&b loudspeakers, this integration can simplify system design and rack configuration while providing access to d&b’s dedicated loudspeaker processing environment.

The D40 also supports Milan network audio, making it suitable for professional digital audio network environments where compatible Milan infrastructure is used.

## Buy a d&b D40 Amplifier

If you are looking for a d&b D40 amplifier for professional audio production, touring, rental or event applications, contact us for current availability, condition, pricing and shipping options.

We can provide detailed equipment information, photographs and purchasing assistance for professional buyers.

Whether you are expanding a d&b system, replacing an existing amplifier or building a professional amplifier inventory, the D40 provides four-channel amplification with integrated DSP, network audio and d&b loudspeaker management in a compact 2 RU chassis.

Contact us for current d&b D40 amplifier availability and pricing.

## Frequently Asked Questions About the d&b D40

### How many channels does the d&b D40 have?

The d&b D40 is a four-channel amplifier, providing four independent amplifier output channels.

### How powerful is the d&b D40?

The D40 is rated for up to 4 x 2400 W into 4 ohms and 4 x 2000 W into 8 ohms under the manufacturer’s specified conditions.

### Does the d&b D40 support Milan?

Yes. The D40 is Milan-enabled and provides up to eight routable Milan audio input channels.

### Does the D40 have built-in DSP?

Yes. The D40 incorporates digital signal processing with loudspeaker management, equalization, filtering and delay functions.

What is the rack size of the D40?

The D40 occupies 2 rack units and is designed for a standard 19-inch rack.

How much does a d&b D40 weigh?

The official weight is approximately 13.8 kg or 30.4 lb.

 What loudspeakers can be powered by the D40?

The D40 is compatible with a range of current d&b audiotechnik loudspeaker systems, including systems in the KSL, V-Series, Y-Series and T-Series families. Compatibility should be checked against the current d&b system and amplifier documentation.

Does the D40 support remote control?

Yes. The D40 can be controlled through the d&b R1 Remote control software and its integrated web interface using Ethernet connectivity.

 What voltage does the D40 support?

The D40 supports 100 to 127 V and 208 to 240 V mains supplies at 50 to 60 Hz, with automatic mains range selection.

Is the d&b D40 suitable for touring?

Yes. The D40 is specifically identified by d&b audiotechnik as a mobile-spe