d&b D6 Hardware - Manual (Page 7)

2.3. Power supply
The switch mode mains power supply permits worldwide application
without the need for mains voltage switching or conversion. The power
supply incorporates active Power Factor Correction (PFC) which
provides a clean and highly efficient sinusoidal current draw, thus
providing highest performance under adverse mains conditions or when
very long power cabling is necessary.
2.3.1. Inrush current limiter
A mains inrush current limiter provides a "soft start" and enables
several units to be powered up at the same time without overloading
the mains power supply.
2.3.2. Mains voltage monitoring
The mains voltage and frequency are recorded by the power supply
and can be viewed on the LCD display. Where voltages outside of this
range are present, a self-resetting protective circuit responds quickly to
isolate the internal amplifier power supply leaving only a supervisory
circuit to monitor the mains voltage. The D6 accepts mains voltages of
up to 400 VAC without damage to the unit.
2.4. Fan
A level and temperature controlled fan is incorporated for cooling the
internal components, which allows greater cooling during louder
program material. The fan speed is consequently reduced during quieter
passages preventing background noise interference. If the D6 heats up
a "Temp. Warning" is given out and the fan will give full cooling power
permanently.
2.5. D6 power amplifiers
The two power amplifiers fitted to the D6 are utilizing Class D
technology similar to a switch mode power supply. Compared to the
known linear amplifier concept (Class A, AB, G or H) the Class D power
amplifiers produce less heat and allow for a compact and light weight
design.
The rated sine wave output power of each channel is 2 x 600 W into an
4 ohms load, decreasing to 2 x 350 W into a 8 ohms load.
2.6. Digital signal processing
The digital signal processing provides loudspeaker specific setups that
are selected using the front panel controls. These setups include all
loudspeaker specific equalization and protection functions. The basic
latency of the D6 is 0.3 ms (analog input including AD/DA conversion).
2.7. Remote control
The REMOTE interface (2 x RJ 45) can be used with the d&b Remote
network (CAN-Bus) to integrate the D6 into a control and monitoring
system.
D6 Amplifier, Hardware manual (1.9 EN) Page 7 of 24