D40 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 Ethernet (OCA/AES70). User interface shall be via a 4.3" (480 x 272 pix.) color touchscreen in conjunction with a digital rotary encoder while remote control shall be via dedicated remote control software.
Four analog input and link output connectors shall be provided.
Two digital input connectors shall be provided, each accepting a 2 channel digital (AES3) audio signal.
Analog inputs shall be electronically balanced with an input impedance of 32 kOhms.
The digital inputs shall be transformer balanced with an input impedance of 110 ohms while the digital link output shall be electronically balanced providing analog signal buffering (refresh) and power fail relay (Bypass).
Signal processing shall utilize 96 kHz sampling rate 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 Mix 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, Mix 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- shelf filters as well as asymmetric filters.
A signal delay capability of up to 10 sec. shall be incorporated for independent application to each channel.
It shall contain a signal generator offering pink noise or sine wave program.
Compensation for cable length shall be incorporated to improve impulse response.
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.
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.
A 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 switched mode power supply shall be incorporated and shall allow automatic mains range selection of 100 to 127 V AC and 208 to 240 V AC, 50 - 60 Hz mains power supply voltages.
Active power factor correction (PFC) shall be incorporated to provide a clean and efficient sinusoidal current draw.
Mains voltage monitoring, mains inrush current limiter, self-resetting overtemperature, under- and overvoltage protection shall be incorporated.
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 2000/2400 W into 8/4 ohms (EIA-426-B signal with a crest factor (CF) of 12 dB, all channels driven) while the maximum output voltage shall be at least 180 Vpeak and the maximum output current shall be 35 Apeak. THD+N (20 Hz – 20 kHz) shall be < –86 dB/0.005% and the Crosstalk (20 Hz – 20 kHz) shall be < –70 dBr while the dynamic range (SNR - digital input unweighted) shall be at least 116 dBr.
The dimensions (H x W x D) shall not exceed 2RU x 19" x 465 mm (18.3") and shall weigh no more than 13.8 kg (30.4 lb).

The amplifier shall be the D40 by:
d&b audiotechnik GmbH & Co. KG.