d&b D90 Amplifier: Quick Start Manual

Introduction

The d&b D90 amplifier is designed for mobile applications and use with applicable d&b loudspeakers. It features a LINEAR mode for operation as a linear power amplifier.

Note: d&b audiotechnik accepts no liability for damage caused to loudspeakers from other brands used with d&b amplifiers in LINEAR mode.

ATTENTION! The device complies with the electromagnetic compatibility requirements of standard EN 55032:2019 for Class B environments (domestic use). However, acoustic interference and malfunctions may occur if the unit operates in close proximity to high-frequency transmitters (wireless microphones, mobile phones, etc.).

About This Manual

This manual covers basic safety instructions, essential technical specifications, and setup instructions for the D90 amplifier. A comprehensive English version with detailed information is available for download from the d&b website.

Loudspeaker Types

Each channel can power a maximum number of loudspeakers depending on their nominal impedance. The minimum recommended impedance per channel is 4 ohms.

The list of d&b loudspeakers supported by the amplifier is found in the amplifier firmware release notes.

Included Items

Ensure the device was delivered complete and in good condition. If the device or its power cord is damaged, do not use it and contact your dealer.

• d&b D90 Amplifier
• Power cord (country-specific)
• d&b D90 Quick Start Manual

Various country-specific power cord connectors are available.

Technical Specifications

Operating Conditions

• Operating Temperature: -10 °C to +40°C (continuous) / +50°C (short term)
• Storage Temperature: -20 °C to +70 °C
• Humidity (relative), without condensation: < 70%
• Maximum altitude above sea level: 2000 m

Power Supply

• Switching power supply with automatic mains voltage range selection and active power factor correction (PFC).
• Mains connector: powerCON-TRUE®
• Mains fuse: Internal

Electrical Specifications

Refer to the detailed tables in the manual for specific values regarding mains voltage, current, power consumption, and heat dissipation across various operating states and loads.

Audio Outputs

• SPEAKER OUTPUTS A/B/C/D: 4 x NL4
• SPEAKER OUTPUTS A/B MIX | 2-WAY / C/D MIX | 2-WAY: 2 x NL4
• 4 CHANNEL OUTPUT: 1 x NL8

Digital Signal Processing

• System turn-on time: < 45 s
• Latency (analog/digital): 0.3 ms
• Sample rate: 44.1 | 48 | 96 | 192 kHz
• Resolution: 16-24 bit

Network

• Connectors: 2 x RJ45 (etherCON®)
• Supports Milan™™ for audio networking and remote control.

Connections

Mains Connector

The device has a powerCON-TRUE® mains connector. Ensure the power cord is properly connected to a grounded mains socket.

WARNING! Risk of electric shock or fire. The device has Class 1 protection. Ensure proper grounding. Do not connect or disconnect the mains plug while it is live.

Audio Input/Output Connectors

• Analog Inputs (A1-A4) and LINK: XLR 3-pin female connectors for inputs, with parallel XLR 3-pin male connectors for LINK outputs.
• Digital Inputs (IN/OUT - D1/2, D3/4): XLR 3-pin female connectors for AES3 digital signals.

Speaker Outputs

The amplifier features NL4 connectors for loudspeaker outputs. Various configurations are possible, including Dual Channel, Mix TOP/SUB, and 2-Way Active modes.

WARNING! Risk of electric shock. Use only insulated speaker cables with properly fitted connectors. Never connect a speaker output to another output, input, or to ground.

Network Connections

• ETH1/PRI: For Milan™™ primary signal and remote control via d&b R1 software or web interface.
• ETH2/SEC: For Milan™™ redundant signal.

Only shielded twisted pair (STP) network cables should be used.

Controls and Indicators

Power Switch

The rotary power switch [5] is located on the front panel.

Touchscreen Display

A 4.3" TFT color touchscreen display [6] with a resolution of 480 x 272 pixels is used for operation. A rotary encoder [7] is also provided for navigation and parameter adjustment.

ATTENTION! The touchscreen is covered by a flexible film that can be damaged by sharp objects or rough handling.

Getting Started

Rack Mounting and Cooling

The unit is designed for standard 19" racks. Ensure adequate airflow through the front and rear of the unit. Do not block air intakes or exhausts.

ATTENTION! When mounting in racks or cabinets, always secure the unit using both front and rear mounting brackets. Ensure sufficient ventilation, especially in enclosed cabinets.

System Reset

To reset the system to factory defaults:

1. Turn off the device.
2. Press and hold the encoder, then turn on the device. A long beep confirms the reset.
3. Release the encoder and press it again briefly within 2 seconds. A short beep confirms.

The device will restart with the message "All device settings have been cleared".

Device Configuration

From the Home screen, select "Device name" to access device configuration settings, including Input, Output, and Network settings.

Channel Configuration

From the Home screen, select "Channel name" to configure individual channels, adjusting parameters like Gain, Delay, EQ, and Mute.

Basic Settings - Quick Reference Guide

1. System Reset

Follow the steps above to reset the system.

2. Device Configuration

Access "Device name" from the Home screen to configure input, output modes, and network settings.

3. Input Settings

Configure input parameters, including gain, for all channels.

4. Output Settings

Select the desired output mode for each amplifier channel pair (e.g., Dual Channel, Mix TOP/SUB, 2-Way Active).

5. Speaker Setup

Configure speaker settings for all channels and confirm each selection.

6. Network Setup

Access network configuration via the "ID" button to set IP addresses and other network parameters.

7. Channel Configuration

Configure individual channel parameters such as CUT, HFA, CPL, Level, DLY, and EQ.

Assistance and Maintenance

Assistance

For any assistance, contact a qualified d&b audiotechnik technician. Do not attempt to service the unit yourself. If the device is damaged, do not operate it.

Maintenance and Servicing

The amplifier is designed for normal operation without maintenance. It does not require filter cleaning or replacement.

Touchscreen Cleaning

Use a soft, lint-free cloth. Avoid solvent-based cleaners. If the screen is very dirty, a special TFT screen cleaner can be used. Spray the cleaner onto the cloth, not directly onto the screen.

Touchscreen Calibration

If the touchscreen becomes inaccurate, recalibrate it by navigating to Device ⇒ More ⇒ Preferences ⇒ Display ⇒ Touch screen calibration.

Manufacturer Declarations

Declaration of Conformity

d&b audiotechnik GmbH & Co. KG declares that the D90 amplifier conforms to relevant directives. Detailed declarations are available upon request or from the d&b website.

WEEE Declaration

Dispose of this product in accordance with local regulations for electronic waste.

Licenses and Copyright

Information on software licenses and copyright is available via the amplifier's Web Remote interface.